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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
(Mark One)
    Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the quarterly period ended JuneSeptember 30, 2021 or
    Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Commission File Number 0-53713 
OTTER TAIL CORPORATION
(Exact name of registrant as specified in its charter) 
Minnesota
(State or other jurisdiction of incorporation or organization)
27-0383995
(I.R.S. Employer Identification No.)
215 South Cascade Street, Box 496, Fergus Falls, Minnesota
(Address of principal executive offices)
56538-0496
(Zip Code)
Registrant's telephone number, including area code: 866-410-8780
Securities registered pursuant to Section 12(b) of the Act: 
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Shares, par value $5.00 per shareOTTRThe Nasdaq Stock Market LLC
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes      No  
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes       No   
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): 
 
Large Accelerated Filer
Accelerated Filer
 
Non-Accelerated Filer
Smaller Reporting Company
Emerging Growth Company
 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act   
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes    No  
Indicate the number of shares outstanding of each of the registrant's classes of common stock, as of the latest practicable date:
41,539,33441,539,984 Common Shares ($5 par value) as of July 30,October 29, 2021. 



Table of Contents
TABLE OF CONTENTS
 DescriptionPage
 
  
ITEM 1. 
 
 
 
 
ITEM 2.
ITEM 3.
ITEM 4.
ITEM 1.
ITEM 1A.
ITEM 6.
 

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DEFINITIONS
The following abbreviations or acronyms are used in the text.
AFUDCAllowance for Funds Used During ConstructionMPUCMinnesota Public Utilities Commission
ARPAlternative Revenue ProgramNDPSCNorth Dakota Public Service Commission
BTDBTD Manufacturing, Inc.Northern PipeNorthern Pipe Products, Inc.
CIPConservation Improvement ProgramOTCOtter Tail Corporation
ECREnvironmental Cost Recovery RiderOTPOtter Tail Power Company
EEPEnergy Efficiency PlanPACEPartnership in Assisting Community Expansion
EPAEnvironmental Protection AgencyPIRPhase-In Rider
ESSRPExecutive Survivor and Supplemental Retirement PlanPTCsProduction tax credits
EUICElectric Utility Infrastructure Cost Recovery RiderPVCPolyvinyl chloride
FCAFuel Clause AdjustmentRHRRegional Haze Rule
FERCFederal Energy Regulatory CommissionROEReturn on equity
GCRGeneration Cost Recovery RiderRRRRenewable Resource Rider
ISOIndependent System OperatorSDPUCSouth Dakota Public Utilities Commission
kWIRPkiloWattIntegrated Resource PlanSECSecurities and Exchange Commission
kwhkWkilowatt-hourkiloWattT.O. PlasticsT.O. Plastics, Inc.
kwhkilowatt-hourTCRTransmission Cost Recovery Rider
MerricourtMerricourt Wind Energy CenterTCRVinyltechTransmission Cost Recovery RiderVinyltech Corporation
MISOMidcontinent Independent System Operator, Inc.VinyltechVinyltech Corporation
FORWARD-LOOKING INFORMATION
This reportQuarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 (the Act). When used in this Form 10-Q and in future filings by the Company with the SEC, in the Company’s press releases and in oral statements, words such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “outlook,” “plan,” “possible,” “potential,” “should,” “will,” “would” or similar expressions are intended to identify forward-looking statements within the meaning of the Act. Such statements are based on current expectations and assumptions and entail various risks and uncertainties that could cause actual results to differ materially from those expressed in such forward-looking statements. The Company’s risks and uncertainties include, among other things, uncertainty of the impact and duration of the COVID-19 pandemic, uncertainty of future investments and capital expenditures, rate base levels and rate base growth, long-term investment risk, seasonal weather patterns and extreme weather events, counterparty credit risk, future business volumes with key customers, reductions in our credit ratings, our ability to access capital markets on favorable terms, assumptions and costs relating to funding our employee benefit plans, our subsidiaries’ ability to make dividend payments, cyber security threats or data breaches, the impact of government legislation and regulation, including foreign trade policy and environmental laws and regulations, the impact of climate change, including compliance with legislative and regulatory changes to address climate change, operational and economic risks associated with our electric generating and manufacturing facilities, risks associated with energy markets, the availability and pricing of resource materials, attracting and maintaining a qualified and stable workforce, expectations regarding regulatory proceedings, and changing macroeconomic and industry conditions. These and other risks and uncertainties are more fully described in our filings with the Securities and Exchange Commission, including our most recently filed Annual Report on Form 10-K. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information.
PART I. FINANCIAL INFORMATION
ITEM 1.FINANCIAL STATEMENTS

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OTTER TAIL CORPORATION
CONSOLIDATED BALANCE SHEETS (unaudited)
(in thousands, except share data)(in thousands, except share data)June 30,
2021
December 31,
2020
(in thousands, except share data)September 30,
2021
December 31,
2020
AssetsAssets  Assets  
Current AssetsCurrent Assets  Current Assets  
Cash and Cash EquivalentsCash and Cash Equivalents$1,480 $1,163 Cash and Cash Equivalents$1,272 $1,163 
Receivables, net of allowance for credit lossesReceivables, net of allowance for credit losses163,424 113,959 Receivables, net of allowance for credit losses178,759 113,959 
InventoriesInventories103,024 92,165 Inventories114,615 92,165 
Regulatory AssetsRegulatory Assets23,250 21,900 Regulatory Assets22,517 21,900 
Other Current AssetsOther Current Assets13,723 5,645 Other Current Assets17,804 5,645 
Total Current AssetsTotal Current Assets304,901 234,832 Total Current Assets334,967 234,832 
Noncurrent AssetsNoncurrent AssetsNoncurrent Assets
InvestmentsInvestments55,809 51,856 Investments55,456 51,856 
Property, Plant and Equipment, net of accumulated depreciationProperty, Plant and Equipment, net of accumulated depreciation2,073,009 2,049,273 Property, Plant and Equipment, net of accumulated depreciation2,083,223 2,049,273 
Regulatory AssetsRegulatory Assets160,018 168,395 Regulatory Assets158,515 168,395 
Intangible Assets, net of accumulated amortizationIntangible Assets, net of accumulated amortization9,594 10,144 Intangible Assets, net of accumulated amortization9,319 10,144 
GoodwillGoodwill37,572 37,572 Goodwill37,572 37,572 
Other Noncurrent AssetsOther Noncurrent Assets30,684 26,282 Other Noncurrent Assets34,096 26,282 
Total Noncurrent AssetsTotal Noncurrent Assets2,366,686 2,343,522 Total Noncurrent Assets2,378,181 2,343,522 
Total AssetsTotal Assets$2,671,587 $2,578,354 Total Assets$2,713,148 $2,578,354 
Liabilities and Shareholders' EquityLiabilities and Shareholders' EquityLiabilities and Shareholders' Equity
Current LiabilitiesCurrent LiabilitiesCurrent Liabilities
Short-Term DebtShort-Term Debt$127,957 $80,997 Short-Term Debt$97,857 $80,997 
Current Maturities of Long-Term DebtCurrent Maturities of Long-Term Debt139,963 140,087 Current Maturities of Long-Term Debt169,962 140,087 
Accounts PayableAccounts Payable131,214 130,805 Accounts Payable135,437 130,805 
Accrued Salaries and WagesAccrued Salaries and Wages23,775 26,908 Accrued Salaries and Wages28,455 26,908 
Accrued TaxesAccrued Taxes14,531 18,831 Accrued Taxes17,972 18,831 
Regulatory LiabilitiesRegulatory Liabilities17,301 16,663 Regulatory Liabilities25,323 16,663 
Other Current LiabilitiesOther Current Liabilities28,743 22,495 Other Current Liabilities35,081 22,495 
Total Current LiabilitiesTotal Current Liabilities483,484 436,786 Total Current Liabilities510,087 436,786 
Noncurrent Liabilities and Deferred CreditsNoncurrent Liabilities and Deferred CreditsNoncurrent Liabilities and Deferred Credits
Pensions Benefit LiabilityPensions Benefit Liability102,331 114,055 Pensions Benefit Liability101,446 114,055 
Other Postretirement Benefits LiabilityOther Postretirement Benefits Liability67,538 67,359 Other Postretirement Benefits Liability68,090 67,359 
Regulatory LiabilitiesRegulatory Liabilities231,766 233,973 Regulatory Liabilities230,733 233,973 
Deferred Income TaxesDeferred Income Taxes167,612 153,376 Deferred Income Taxes176,502 153,376 
Deferred Tax CreditsDeferred Tax Credits17,033 17,405 Deferred Tax Credits16,847 17,405 
Other Noncurrent LiabilitiesOther Noncurrent Liabilities62,160 60,002 Other Noncurrent Liabilities62,342 60,002 
Total Noncurrent Liabilities and Deferred CreditsTotal Noncurrent Liabilities and Deferred Credits648,440 646,170 Total Noncurrent Liabilities and Deferred Credits655,960 646,170 
Commitments and Contingencies (Note 9)
Commitments and Contingencies (Note 9)
00
Commitments and Contingencies (Note 9)
00
CapitalizationCapitalizationCapitalization
Long-Term Debt, net of current maturitiesLong-Term Debt, net of current maturities624,540 624,432 Long-Term Debt, net of current maturities594,619 624,432 
Shareholders' EquityShareholders' EquityShareholders' Equity
Common Shares: 50,000,000 shares authorized of $5 par value; 41,538,709 and 41,469,879 outstanding
at June 30, 2021 and December 31, 2020
207,694 207,349 
Common Shares: 50,000,000 shares authorized of $5 par value; 41,539,984 and 41,469,879 outstanding
at September 30, 2021 and December 31, 2020
Common Shares: 50,000,000 shares authorized of $5 par value; 41,539,984 and 41,469,879 outstanding
at September 30, 2021 and December 31, 2020
207,700 207,349 
Additional Paid-In CapitalAdditional Paid-In Capital417,870 414,246 Additional Paid-In Capital418,568 414,246 
Retained EarningsRetained Earnings297,850 257,878 Retained Earnings334,385 257,878 
Accumulated Other Comprehensive LossAccumulated Other Comprehensive Loss(8,291)(8,507)Accumulated Other Comprehensive Loss(8,171)(8,507)
Total Shareholders' EquityTotal Shareholders' Equity915,123 870,966 Total Shareholders' Equity952,482 870,966 
Total CapitalizationTotal Capitalization1,539,663 1,495,398 Total Capitalization1,547,101 1,495,398 
Total Liabilities and Shareholders' EquityTotal Liabilities and Shareholders' Equity$2,671,587 $2,578,354 Total Liabilities and Shareholders' Equity$2,713,148 $2,578,354 
See accompanying notes to consolidated financial statements.
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OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF INCOME (unaudited)
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands, except per-share amounts)(in thousands, except per-share amounts)2021202020212020(in thousands, except per-share amounts)2021202020212020
Operating RevenuesOperating Revenues  Operating Revenues  
ElectricElectric$106,155 $98,130 $229,855 $218,000 Electric$118,775 $115,213 $348,629 $333,213 
Product SalesProduct Sales179,453 94,626 317,463 209,503 Product Sales197,519 120,542 514,983 330,045 
Total Operating RevenuesTotal Operating Revenues285,608 192,756 547,318 427,503 Total Operating Revenues316,294 235,755 863,612 663,258 
Operating ExpensesOperating ExpensesOperating Expenses
Electric Production FuelElectric Production Fuel12,164 8,788 26,878 22,523 Electric Production Fuel17,698 11,554 44,576 34,077 
Electric Purchased PowerElectric Purchased Power11,135 13,682 30,395 32,512 Electric Purchased Power9,878 13,428 40,273 45,940 
Electric Operating and Maintenance ExpensesElectric Operating and Maintenance Expenses36,729 33,179 78,150 73,794 Electric Operating and Maintenance Expenses36,465 32,845 114,615 106,639 
Cost of Products Sold (excluding depreciation)Cost of Products Sold (excluding depreciation)122,578 73,832 224,555 159,711 Cost of Products Sold (excluding depreciation)134,212 86,856 358,767 246,567 
Other Nonelectric ExpensesOther Nonelectric Expenses15,669 10,762 29,362 22,662 Other Nonelectric Expenses16,224 13,615 45,587 36,277 
Depreciation and AmortizationDepreciation and Amortization23,169 20,436 45,295 40,835 Depreciation and Amortization22,815 20,395 68,109 61,230 
Electric Property TaxesElectric Property Taxes4,342 4,168 8,662 8,268 Electric Property Taxes4,474 4,333 13,136 12,601 
Total Operating ExpensesTotal Operating Expenses225,786 164,847 443,297 360,305 Total Operating Expenses241,766 183,026 685,063 543,331 
Operating IncomeOperating Income59,822 27,909 104,021 67,198 Operating Income74,528 52,729 178,549 119,927 
Other Income and ExpenseOther Income and ExpenseOther Income and Expense
Interest ChargesInterest Charges9,555 8,662 18,953 16,785 Interest Charges9,648 8,568 28,601 25,353 
Nonservice Cost Components of Postretirement BenefitsNonservice Cost Components of Postretirement Benefits624 868 1,006 1,739 Nonservice Cost Components of Postretirement Benefits505 842 1,511 2,581 
Other Income (Expense), netOther Income (Expense), net734 2,410 1,892 2,021 Other Income (Expense), net203 1,712 2,095 3,733 
Income Before Income TaxesIncome Before Income Taxes50,377 20,789 85,954 50,695 Income Before Income Taxes64,578 45,031 150,532 95,726 
Income Tax ExpenseIncome Tax Expense8,308 3,808 13,556 9,446 Income Tax Expense11,824 9,097 25,380 18,543 
Net IncomeNet Income$42,069 $16,981 $72,398 $41,249 Net Income$52,754 $35,934 $125,152 $77,183 
Weighted-Average Common Shares Outstanding:Weighted-Average Common Shares Outstanding:Weighted-Average Common Shares Outstanding:
BasicBasic41,500 40,513 41,478 40,365 Basic41,504 40,914 41,487 40,548 
DilutedDiluted41,818 40,677 41,759 40,561 Diluted41,869 41,078 41,795 40,733 
Earnings Per Share:Earnings Per Share:Earnings Per Share:
BasicBasic$1.01 $0.42 $1.75 $1.02 Basic$1.27 $0.88 $3.02 $1.90 
DilutedDiluted$1.01 $0.42 $1.73 $1.02 Diluted$1.26 $0.87 $2.99 $1.89 
See accompanying notes to consolidated financial statements.
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OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Net IncomeNet Income$42,069 $16,981 $72,398 $41,249 Net Income$52,754 $35,934 $125,152 $77,183 
Other Comprehensive Income (Loss):Other Comprehensive Income (Loss):Other Comprehensive Income (Loss):
Unrealized Gain (Loss) on Available-for-Sale Securities:Unrealized Gain (Loss) on Available-for-Sale Securities:Unrealized Gain (Loss) on Available-for-Sale Securities:
Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income (Expense)Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income (Expense)(38)32 (43)34 Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income (Expense) (21)(43)13 
Unrealized Gains (Losses)Unrealized Gains (Losses)(11)92 (52)218 Unrealized Gains (Losses)(33)(13)(85)205 
Income Tax (Expense) BenefitIncome Tax (Expense) Benefit10 (26)20 (53)Income Tax (Expense) Benefit7 27 (46)
Available-for-Sale Securities, net of taxAvailable-for-Sale Securities, net of tax(39)98 (75)199 Available-for-Sale Securities, net of tax(26)(27)(101)172 
Pension and Postretirement Benefit Plans:Pension and Postretirement Benefit Plans:Pension and Postretirement Benefit Plans:
Amortization of Unrecognized Postretirement Benefit Losses and CostsAmortization of Unrecognized Postretirement Benefit Losses and Costs190 137 394 275 Amortization of Unrecognized Postretirement Benefit Losses and Costs197 138 591 413 
Income Tax ExpenseIncome Tax Expense(50)(36)(103)(72)Income Tax Expense(51)(36)(154)(108)
Pension and Postretirement Benefit Plan, net of taxPension and Postretirement Benefit Plan, net of tax140 101 291 203 Pension and Postretirement Benefit Plan, net of tax146 102 437 305 
Total Other Comprehensive Income
Total Other Comprehensive Income
101 199 216 402 
Total Other Comprehensive Income
120 75 336 477 
Total Comprehensive IncomeTotal Comprehensive Income$42,170 $17,180 $72,614 $41,651 Total Comprehensive Income$52,874 $36,009 $125,488 $77,660 
See accompanying notes to consolidated financial statements.
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OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited)
(in thousands, except common shares outstanding)(in thousands, except common shares outstanding)Common
Shares
Outstanding
Par Value,
Common
Shares
Additional Paid-In CapitalRetained
Earnings
Accumulated
Other
Comprehensive
Income (Loss)1
Total Shareholders' Equity(in thousands, except common shares outstanding)Common
Shares
Outstanding
Par Value,
Common
Shares
Additional Paid-In CapitalRetained
Earnings
Accumulated
Other
Comprehensive
Income (Loss)1
Total Shareholders' Equity
Balance, March 31, 202141,510,455 $207,552 $416,707 $271,999 $(8,392)$887,866 
Balance, June 30, 2021Balance, June 30, 202141,538,709 $207,694 $417,870 $297,850 $(8,291)$915,123 
Common Stock Issuances, Net of ExpensesCommon Stock Issuances, Net of Expenses28,254 142 (164)— — (22)Common Stock Issuances, Net of Expenses1,275 (6)— — — 
Common Stock Retirements and ForfeituresCommon Stock Retirements and Forfeitures— — (126)— — (126)
Net IncomeNet Income— — — 42,069 — 42,069 Net Income— — — 52,754 — 52,754 
Other Comprehensive IncomeOther Comprehensive Income— — — — 101 101 Other Comprehensive Income— — — — 120 120 
Stock Compensation ExpenseStock Compensation Expense— — 1,327 — — 1,327 Stock Compensation Expense— — 830 — — 830 
Common Dividends ($0.39 per share)Common Dividends ($0.39 per share)— — — (16,218)— (16,218)Common Dividends ($0.39 per share)— — — (16,219)— (16,219)
Balance, June 30, 202141,538,709 $207,694 $417,870 $297,850 $(8,291)$915,123 
Balance, September 30, 2021Balance, September 30, 202141,539,984 $207,700 $418,568 $334,385 $(8,171)$952,482 
Balance, March 31, 202040,376,448 $201,882 $372,669 $231,702 $(6,234)$800,019 
Balance, June 30, 2020Balance, June 30, 202040,848,828 $204,244 $390,141 $233,705 $(6,035)$822,055 
Common Stock Issuances, Net of ExpensesCommon Stock Issuances, Net of Expenses472,380 2,362 16,235 — — 18,597 Common Stock Issuances, Net of Expenses203,337 1,017 6,885 — — 7,902 
Net IncomeNet Income— — — 16,981 — 16,981 Net Income— — — 35,934 — 35,934 
Other Comprehensive IncomeOther Comprehensive Income— — — — 199 199 Other Comprehensive Income— — — — 75 75 
Stock Compensation ExpenseStock Compensation Expense— — 1,237 — — 1,237 Stock Compensation Expense— — 1,275 — — 1,275 
Common Dividends ($0.37 per share)Common Dividends ($0.37 per share)— — — (14,978)— (14,978)Common Dividends ($0.37 per share)— — — (15,171)— (15,171)
Balance, June 30, 202040,848,828 $204,244 $390,141 $233,705 $(6,035)$822,055 
Balance, September 30, 2020Balance, September 30, 202041,052,165 $205,261 $398,301 $254,468 $(5,960)$852,070 
Balance, December 31, 2020Balance, December 31, 202041,469,879 $207,349 $414,246 $257,878 $(8,507)$870,966 Balance, December 31, 202041,469,879 $207,349 $414,246 $257,878 $(8,507)$870,966 
Common Stock Issuances, Net of ExpensesCommon Stock Issuances, Net of Expenses104,531 524 (572)— — (48)Common Stock Issuances, Net of Expenses105,806 530 (578)— — (48)
Common Stock Retirements and ForfeituresCommon Stock Retirements and Forfeitures(35,701)(179)(1,328)— — (1,507)Common Stock Retirements and Forfeitures(35,701)(179)(1,454)— — (1,633)
Net IncomeNet Income— — — 72,398 — 72,398 Net Income— — — 125,152 — 125,152 
Other Comprehensive IncomeOther Comprehensive Income— — — — 216 216 Other Comprehensive Income— — — — 336 336 
Stock Compensation ExpenseStock Compensation Expense— — 5,524 — — 5,524 Stock Compensation Expense— — 6,354 — — 6,354 
Common Dividends ($0.78 per share)— — — (32,426)— (32,426)
Balance, June 30, 202141,538,709 $207,694 $417,870 $297,850 $(8,291)$915,123 
Common Dividends ($1.17 per share)Common Dividends ($1.17 per share)— — — (48,645)— (48,645)
Balance, September 30, 2021Balance, September 30, 202141,539,984 $207,700 $418,568 $334,385 $(8,171)$952,482 
Balance, December 31, 2019Balance, December 31, 201940,157,591 $200,788 $364,790 $222,341 $(6,437)$781,482 Balance, December 31, 201940,157,591 $200,788 $364,790 $222,341 $(6,437)$781,482 
Common Stock Issuances, Net of ExpensesCommon Stock Issuances, Net of Expenses729,454 3,647 23,222 — — 26,869 Common Stock Issuances, Net of Expenses932,791 4,664 30,107 — — 34,771 
Common Stock Retirements and ForfeituresCommon Stock Retirements and Forfeitures(38,217)(191)(1,878)— — (2,069)Common Stock Retirements and Forfeitures(38,217)(191)(1,878)— — (2,069)
Net IncomeNet Income— — — 41,249 — 41,249 Net Income— — — 77,183 — 77,183 
Other Comprehensive IncomeOther Comprehensive Income— — — — 402 402 Other Comprehensive Income— — — — 477 477 
Stock Compensation ExpenseStock Compensation Expense— — 4,007 — — 4,007 Stock Compensation Expense— — 5,282 — — 5,282 
Common Dividends ($0.74 per share)— — — (29,885)— (29,885)
Balance, June 30, 202040,848,828 $204,244 $390,141 $233,705 $(6,035)$822,055 
Common Dividends ($1.11 per share)Common Dividends ($1.11 per share)— — — (45,056)— (45,056)
Balance, September 30, 2020Balance, September 30, 202041,052,165 $205,261 $398,301 $254,468 $(5,960)$852,070 
 
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1Accumulated Other Comprehensive Income (Loss) as of June 30, 2021 and December 31, 2020 is comprised of the following:
1Accumulated Other Comprehensive Income (Loss) as of September 30, 2021 and December 31, 2020 is comprised of the following:
1Accumulated Other Comprehensive Income (Loss) as of September 30, 2021 and December 31, 2020 is comprised of the following:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
Unrealized Gain on Available-for-Sale Debt Securities:Unrealized Gain on Available-for-Sale Debt Securities:  Unrealized Gain on Available-for-Sale Debt Securities:  
Before TaxBefore Tax$170 $265 Before Tax$137 $265 
Tax EffectTax Effect(36)(56)Tax Effect(29)(56)
Unrealized Gain on Available-for-Sale Debt, net of taxUnrealized Gain on Available-for-Sale Debt, net of tax134 209 Unrealized Gain on Available-for-Sale Debt, net of tax108 209 
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits:Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits:Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits:
Before TaxBefore Tax(11,399)(11,793)Before Tax(11,202)(11,793)
Tax EffectTax Effect2,974 3,077 Tax Effect2,923 3,077 
Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of taxUnamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of tax(8,425)(8,716)Unamortized Actuarial Losses and Prior Service Costs Related to Pension and Postretirement Benefits, net of tax(8,279)(8,716)
Accumulated Other Comprehensive Loss:Accumulated Other Comprehensive Loss:Accumulated Other Comprehensive Loss:
Before TaxBefore Tax(11,229)(11,528)Before Tax(11,065)(11,528)
Tax EffectTax Effect2,938 3,021 Tax Effect2,894 3,021 
Net Accumulated Other Comprehensive LossNet Accumulated Other Comprehensive Loss$(8,291)$(8,507)Net Accumulated Other Comprehensive Loss$(8,171)$(8,507)
See accompanying notes to consolidated financial statements.
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OTTER TAIL CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)
Six Months Ended June 30,Nine Months Ended September 30,
(in thousands)(in thousands)20212020(in thousands)20212020
Operating ActivitiesOperating Activities  Operating Activities  
Net IncomeNet Income$72,398 $41,249 Net Income$125,152 $77,183 
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and AmortizationDepreciation and Amortization45,295 40,835 Depreciation and Amortization68,109 61,230 
Deferred Tax CreditsDeferred Tax Credits(372)(657)Deferred Tax Credits(558)(986)
Deferred Income TaxesDeferred Income Taxes11,327 9,472 Deferred Income Taxes18,835 20,353 
Change in Deferred Debits and Other AssetsChange in Deferred Debits and Other Assets5,749 5,565 Change in Deferred Debits and Other Assets6,166 3,439 
Discretionary Contribution to Pension PlanDiscretionary Contribution to Pension Plan(10,000)(11,200)Discretionary Contribution to Pension Plan(10,000)(11,200)
Change in Noncurrent Liabilities and Deferred CreditsChange in Noncurrent Liabilities and Deferred Credits(3,710)5,178 Change in Noncurrent Liabilities and Deferred Credits2,662 3,237 
Allowance for Equity Funds Used During ConstructionAllowance for Equity Funds Used During Construction(172)(1,858)Allowance for Equity Funds Used During Construction(427)(3,104)
Stock Compensation ExpenseStock Compensation Expense5,524 4,007 Stock Compensation Expense6,354 5,282 
Other, NetOther, Net(3,246)(147)Other, Net(3,480)(176)
Cash (Used for) Provided by Current Assets and Current Liabilities:Cash (Used for) Provided by Current Assets and Current Liabilities:Cash (Used for) Provided by Current Assets and Current Liabilities:
Change in ReceivablesChange in Receivables(49,465)(3,929)Change in Receivables(64,800)(20,025)
Change in InventoriesChange in Inventories(10,859)8,097 Change in Inventories(22,450)15,980 
Change in Other Current AssetsChange in Other Current Assets(8,080)(1,066)Change in Other Current Assets(12,159)2,023 
Change in Payables and Other Current LiabilitiesChange in Payables and Other Current Liabilities12,375 (23,562)Change in Payables and Other Current Liabilities40,574 (12,063)
Change in Interest Payable and Income Taxes Receivable/PayableChange in Interest Payable and Income Taxes Receivable/Payable1,810 1,917 Change in Interest Payable and Income Taxes Receivable/Payable774 103 
Net Cash Provided by Operating ActivitiesNet Cash Provided by Operating Activities68,574 73,901 Net Cash Provided by Operating Activities154,752 141,276 
Investing ActivitiesInvesting ActivitiesInvesting Activities
Capital ExpendituresCapital Expenditures(76,891)(119,830)Capital Expenditures(117,312)(220,630)
Proceeds from Disposal of Noncurrent AssetsProceeds from Disposal of Noncurrent Assets4,562 3,953 Proceeds from Disposal of Noncurrent Assets5,819 4,617 
Cash Used for Investments and Other AssetsCash Used for Investments and Other Assets(4,074)(5,128)Cash Used for Investments and Other Assets(5,591)(6,372)
Net Cash Used in Investing ActivitiesNet Cash Used in Investing Activities(76,403)(121,005)Net Cash Used in Investing Activities(117,084)(222,385)
Financing ActivitiesFinancing ActivitiesFinancing Activities
Change in Checks Written in Excess of CashChange in Checks Written in Excess of Cash(4,586)550 Change in Checks Written in Excess of Cash(3,133)90 
Net Short-Term BorrowingsNet Short-Term Borrowings46,960 35,239 Net Short-Term Borrowings16,860 42,600 
Proceeds from Issuance of Common StockProceeds from Issuance of Common Stock0 27,225 Proceeds from Issuance of Common Stock 35,219 
Common Stock Issuance ExpensesCommon Stock Issuance Expenses(67)(374)Common Stock Issuance Expenses(67)(465)
Payments for Shares Withheld for Employee Tax ObligationsPayments for Shares Withheld for Employee Tax Obligations(1,507)(2,069)Payments for Shares Withheld for Employee Tax Obligations(1,633)(2,069)
Proceeds from Issuance of Long-Term DebtProceeds from Issuance of Long-Term Debt0 35,000 Proceeds from Issuance of Long-Term Debt 75,000 
Debt Issuance ExpensesDebt Issuance Expenses(59)(179)Debt Issuance Expenses(772)(369)
Payments for Retirement of Long-Term DebtPayments for Retirement of Long-Term Debt(169)(90)Payments for Retirement of Long-Term Debt(169)(136)
Dividends PaidDividends Paid(32,426)(29,885)Dividends Paid(48,645)(45,056)
Net Cash Provided by Financing Activities
8,146 65,417 
Net Cash (Used in) Provided by Financing Activities
Net Cash (Used in) Provided by Financing Activities
(37,559)104,814 
Net Change in Cash and Cash EquivalentsNet Change in Cash and Cash Equivalents317 18,313 Net Change in Cash and Cash Equivalents109 23,705 
Cash and Cash Equivalents at Beginning of PeriodCash and Cash Equivalents at Beginning of Period1,163 21,199 Cash and Cash Equivalents at Beginning of Period1,163 21,199 
Cash and Cash Equivalents at End of PeriodCash and Cash Equivalents at End of Period$1,480 $39,512 Cash and Cash Equivalents at End of Period$1,272 $44,904 
Supplemental Disclosure of Noncash Investing ActivitiesSupplemental Disclosure of Noncash Investing ActivitiesSupplemental Disclosure of Noncash Investing Activities
Transactions Related to Capital Additions Not Settled in Cash$9,875 $61,925 
Accrued Property, Plant, and Equipment AdditionsAccrued Property, Plant, and Equipment Additions$14,358 $112,314 
See accompanying notes to consolidated financial statements
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OTTER TAIL CORPORATION
CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (unaudited)
1. Summary of Significant Accounting Policies
Overview
Otter Tail Corporation and its subsidiaries (collectively, the "Company", "us", "our" or "we") form a diverse, multi-platform business consisting of a vertically integrated, regulated utility with generation, transmission and distribution facilities complemented by manufacturing businesses providing metal fabrication for custom machine parts and metal components, manufacturing of extruded and thermoformed plastic products, and manufacturing of PVC pipe products. We classify our business into 3 segments: Electric, Manufacturing and Plastics.
Basis of Presentation
The unaudited consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the SEC for interim reporting. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles. In the opinion of management, we have included all adjustments, including normal recurring accruals, necessary for a fair presentation of the consolidated financial statements for the periods presented. The consolidated financial statements and condensed notes thereto should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.
Because of the coronavirus (COVID-19) pandemic, the seasonality of our businesses and other factors, the earnings for the three and sixnine months ended JuneSeptember 30, 2021 should not be taken as an indication of earnings for all or any part of the balance of the current year or as an indication of earnings for future years.
Use of Estimates
We use estimates based on the best information available in recording transactions and balances resulting from business operations. As better information becomes available, or actual amounts are known, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.
2. Segment Information
We classify our business into 3 segments, Electric, Manufacturing and Plastics, consistent with our business strategy, organizational structure and our internal reporting and review processes used by our chief operating decision maker to make decisions regarding allocation of resources, to assess operating performance and to make strategic decisions.
Certain assets and costs are not allocated to our operating segments. Corporate operating costs include items such as corporate staff and overhead costs, the results of our captive insurance company and other items excluded from the measurement of operating segment performance. Corporate assets consist primarily of cash, prepaid expenses, investments and fixed assets. Corporate is not an operating segment, rather it is added to operating segment totals to reconcile to consolidated amounts.
Information for each segment and our unallocated corporate costs for the three and sixnine months ended JuneSeptember 30, 2021 and 2020 are as follows:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Operating Revenue1
Operating Revenue1
Operating Revenue1
ElectricElectric$106,155 $98,130 $229,855 $218,000 Electric$118,775 $115,213 $348,629 $333,213 
ManufacturingManufacturing84,284 45,947 160,107 114,427 Manufacturing89,977 59,849 250,085 174,276 
PlasticsPlastics95,169 48,679 157,356 95,076 Plastics107,542 60,693 264,898 155,769 
TotalTotal$285,608 $192,756 $547,318 $427,503 Total$316,294 $235,755 $863,612 $663,258 
Net Income (Loss)Net Income (Loss)Net Income (Loss)
ElectricElectric$15,433 $13,306 $33,019 $29,488 Electric$22,528 $24,737 $55,547 $54,225 
ManufacturingManufacturing5,705 238 11,089 5,165 Manufacturing4,200 3,311 15,290 8,476 
PlasticsPlastics22,544 5,130 31,692 10,579 Plastics28,410 10,343 60,102 20,922 
CorporateCorporate(1,613)(1,693)(3,402)(3,983)Corporate(2,384)(2,457)(5,787)(6,440)
TotalTotal$42,069 $16,981 $72,398 $41,249 Total$52,754 $35,934 $125,152 $77,183 
1Amounts reflect operating revenues to external customers. Intersegment operating revenues are not material for any period presented.
1Amounts reflect operating revenues to external customers. Intersegment operating revenues are not material for any period presented.
1Amounts reflect operating revenues to external customers. Intersegment operating revenues are not material for any period presented.
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The following provides the identifiable assets by segment and corporate assets as of JuneSeptember 30, 2021 and December 31, 2020:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
Identifiable AssetsIdentifiable AssetsIdentifiable Assets
ElectricElectric$2,259,896 $2,233,399 Electric$2,271,636 $2,233,399 
ManufacturingManufacturing220,896 191,005 Manufacturing242,414 191,005 
PlasticsPlastics136,604 99,767 Plastics143,615 99,767 
CorporateCorporate54,191 54,183 Corporate55,483 54,183 
TotalTotal$2,671,587 $2,578,354 Total$2,713,148 $2,578,354 
3. Revenue
We present our operating revenues to external customers, in total and by amounts arising from contracts with customers and alternative revenue program (ARP) arrangements, disaggregated by revenue source and segment for the three and sixnine months ended JuneSeptember 30, 2021 and 2020:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Operating RevenuesOperating RevenuesOperating Revenues
Electric SegmentElectric SegmentElectric Segment
Retail: ResidentialRetail: Residential$28,709 $27,862 $66,176 $63,705 Retail: Residential$33,902 $32,734 $100,067 $96,440 
Retail: Commercial and IndustrialRetail: Commercial and Industrial58,390 55,914 124,811 124,853 Retail: Commercial and Industrial60,557 64,918 185,376 189,771 
Retail: OtherRetail: Other1,888 1,777 3,706 3,598 Retail: Other1,979 1,953 5,687 5,550 
Total Retail Total Retail88,987 85,553 194,693 192,156  Total Retail96,438 99,605 291,130 291,761 
TransmissionTransmission11,840 9,673 23,785 20,514 Transmission13,300 12,288 37,085 32,802 
WholesaleWholesale3,260 765 7,767 1,641 Wholesale6,944 1,500 14,711 3,141 
OtherOther2,068 2,139 3,610 3,689 Other2,093 1,820 5,703 5,509 
Total Electric SegmentTotal Electric Segment106,155 98,130 229,855 218,000 Total Electric Segment118,775 115,213 348,629 333,213 
Manufacturing SegmentManufacturing SegmentManufacturing Segment
Metal Parts and ToolingMetal Parts and Tooling71,013 37,266 133,686 94,478 Metal Parts and Tooling76,455 50,957 210,141 145,435 
Plastic Products and ToolingPlastic Products and Tooling10,131 7,840 20,426 17,723 Plastic Products and Tooling10,198 7,600 30,624 25,323 
Scrap Metal SalesScrap Metal Sales3,140 841 5,995 2,226 Scrap Metal Sales3,324 1,292 9,320 3,518 
Total Manufacturing SegmentTotal Manufacturing Segment84,284 45,947 160,107 114,427 Total Manufacturing Segment89,977 59,849 250,085 174,276 
Plastics SegmentPlastics SegmentPlastics Segment
PVC PipePVC Pipe95,169 48,679 157,356 95,076 PVC Pipe107,542 60,693 264,898 155,769 
Total Operating RevenueTotal Operating Revenue285,608 192,756 547,318 427,503 Total Operating Revenue316,294 235,755 863,612 663,258 
Less: Noncontract Revenues Included Above
Less: Non-contract Revenues Included AboveLess: Non-contract Revenues Included Above
Electric Segment - ARP RevenuesElectric Segment - ARP Revenues(1,782)209 (2,757)122 Electric Segment - ARP Revenues(33)2,778 (2,790)2,900 
Total Operating Revenues from Contracts with CustomersTotal Operating Revenues from Contracts with Customers$287,390 $192,547 $550,075 $427,381 Total Operating Revenues from Contracts with Customers$316,327 $232,977 $866,402 $660,358 
4. Select Balance Sheet Information
Receivables and Allowance for Credit Losses
Receivables as of JuneSeptember 30, 2021 and December 31, 2020 are as follows:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
ReceivablesReceivablesReceivables
TradeTrade$135,744 $87,048 Trade$152,906 $87,048 
OtherOther12,252 8,939 Other11,182 8,939 
Unbilled ReceivablesUnbilled Receivables18,154 21,187 Unbilled Receivables17,003 21,187 
Total ReceivablesTotal Receivables166,150 117,174 Total Receivables181,091 117,174 
Less: Allowance for Credit LossesLess: Allowance for Credit Losses2,726 3,215 Less: Allowance for Credit Losses2,332 3,215 
Receivables, net of allowance for credit lossesReceivables, net of allowance for credit losses$163,424 $113,959 Receivables, net of allowance for credit losses$178,759 $113,959 
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The following is a summary of activity in the allowance for credit losses for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020(in thousands)20212020
Beginning Balance, January 1Beginning Balance, January 1$3,215 $1,339 Beginning Balance, January 1$3,215 $1,339 
Additions Charged to ExpenseAdditions Charged to Expense284 1,371 Additions Charged to Expense177 1,845 
Reductions for Amounts Written-Off, Net of Recoveries(773)(655)
Ending Balance, June 30$2,726 $2,055 
Reductions for Amounts Written Off, Net of RecoveriesReductions for Amounts Written Off, Net of Recoveries(1,060)(923)
Ending Balance, September 30Ending Balance, September 30$2,332 $2,261 
Inventories
Inventories consist of the following as of JuneSeptember 30, 2021 and December 31, 2020:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
Finished GoodsFinished Goods$21,272 $22,046 Finished Goods$25,727 $22,046 
Work in ProcessWork in Process24,140 16,210 Work in Process29,932 16,210 
Raw Material, Fuel and SuppliesRaw Material, Fuel and Supplies57,612 53,909 Raw Material, Fuel and Supplies58,956 53,909 
Total InventoriesTotal Inventories$103,024 $92,165 Total Inventories$114,615 $92,165 
Investments
The following is a summary of our investments as of JuneSeptember 30, 2021 and December 31, 2020:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
Corporate-Owned Life Insurance PoliciesCorporate-Owned Life Insurance Policies$39,492 $36,825 Corporate-Owned Life Insurance Policies$40,096 $36,825 
Debt SecuritiesDebt Securities9,227 9,260 Debt Securities9,208 9,260 
Money Market FundsMoney Market Funds1,861 4,075 Money Market Funds953 4,075 
Mutual FundsMutual Funds5,201 1,662 Mutual Funds5,170 1,662 
Other InvestmentsOther Investments28 34 Other Investments29 34 
Total InvestmentsTotal Investments$55,809 $51,856 Total Investments$55,456 $51,856 
The amount of unrealized gains and losses on debt securities as of JuneSeptember 30, 2021 and December 31, 2020 are not material and no unrealized losses were deemed to be other-than-temporary. In addition, the amount of unrealized gains and losses on marketable equity securities still held as of JuneSeptember 30, 2021 and December 31, 2020 are not material.
Property, Plant and Equipment
Major classes of property, plant and equipment as of JuneSeptember 30, 2021 and December 31, 2020 include:
(in thousands)(in thousands)June 30,
2021
December 31,
2020
(in thousands)September 30,
2021
December 31,
2020
Electric Plant in ServiceElectric Plant in Service  Electric Plant in Service  
Electric Plant in ServiceElectric Plant in Service$2,699,352 $2,531,352 Electric Plant in Service$2,705,778 $2,531,352 
Construction Work in ProgressConstruction Work in Progress87,676 203,078 Construction Work in Progress100,495 203,078 
Total Gross Electric PlantTotal Gross Electric Plant2,787,028 2,734,430 Total Gross Electric Plant2,806,273 2,734,430 
Less Accumulated Depreciation and AmortizationLess Accumulated Depreciation and Amortization811,134 778,988 Less Accumulated Depreciation and Amortization822,441 778,988 
Net Electric PlantNet Electric Plant1,975,894 1,955,442 Net Electric Plant1,983,832 1,955,442 
Nonelectric Property, Plant and EquipmentNonelectric Property, Plant and EquipmentNonelectric Property, Plant and Equipment
Nonelectric Property, Plant and Equipment in ServiceNonelectric Property, Plant and Equipment in Service261,065 258,730 Nonelectric Property, Plant and Equipment in Service263,880 258,730 
Construction Work in ProgressConstruction Work in Progress12,936 9,290 Construction Work in Progress15,564 9,290 
Total Gross Nonelectric Property, Plant and EquipmentTotal Gross Nonelectric Property, Plant and Equipment274,001 268,020 Total Gross Nonelectric Property, Plant and Equipment279,444 268,020 
Less Accumulated Depreciation and AmortizationLess Accumulated Depreciation and Amortization176,886 174,189 Less Accumulated Depreciation and Amortization180,053 174,189 
Net Nonelectric Property, Plant and EquipmentNet Nonelectric Property, Plant and Equipment97,115 93,831 Net Nonelectric Property, Plant and Equipment99,391 93,831 
Net Property, Plant and EquipmentNet Property, Plant and Equipment$2,073,009 $2,049,273 Net Property, Plant and Equipment$2,083,223 $2,049,273 
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5. Regulatory Matters
Regulatory Assets and Liabilities
The following presents our current and long-term regulatory assets and liabilities as of JuneSeptember 30, 2021 and December 31, 2020 and the period we expect to recover or refund such amounts:
Period ofJune 30, 2021December 31, 2020Period ofSeptember 30, 2021December 31, 2020
(in thousands)(in thousands)Recovery/RefundCurrentLong-TermCurrentLong Term(in thousands)Recovery/RefundCurrentLong-TermCurrentLong Term
Regulatory AssetsRegulatory AssetsRegulatory Assets
Pension and Other Postretirement Benefit Plans1
Pension and Other Postretirement Benefit Plans1
Various$11,037 $141,668 $11,037 $146,071 
Pension and Other Postretirement Benefit Plans1
Various$11,037 $139,467 $11,037 $146,071 
Alternative Revenue Program Riders2
Alternative Revenue Program Riders2
Up to 3 years6,505 8,982 8,871 9,373 
Alternative Revenue Program Riders2
Up to 3 years7,229 8,225 8,871 9,373 
Asset Retirement Obligations1
Asset Retirement Obligations1
Asset lives6,696 8,462 
Asset Retirement Obligations1
Asset lives— 7,065 — 8,462 
ISO Cost Recovery Trackers1
ISO Cost Recovery Trackers1
Up to 2 years539 724 1,079 867 
ISO Cost Recovery Trackers1
Up to 2 years270 1,027 1,079 867 
Unrecovered Project Costs1
Unrecovered Project Costs1
Up to 3 years4,114 1,492 361 2,989 
Unrecovered Project Costs1
Up to 3 years3,227 1,456 361 2,989 
Deferred Rate Case Expenses1
Deferred Rate Case Expenses1
Various888 110 360 230 
Deferred Rate Case Expenses1
Various637 936 360 230 
Debt Reacquisition Premiums1
Debt Reacquisition Premiums1
Up to 12 years167 263 192 341 
Debt Reacquisition Premiums1
Up to 12 years117 262 192 341 
Other1
Other1
Various0 83 62 
Other1
Various 77 — 62 
Total Regulatory AssetsTotal Regulatory Assets$23,250 $160,018 $21,900 $168,395 Total Regulatory Assets$22,517 $158,515 $21,900 $168,395 
Regulatory LiabilitiesRegulatory LiabilitiesRegulatory Liabilities
Deferred Income TaxesDeferred Income TaxesAsset lives$0 $131,893 $$134,719 Deferred Income TaxesAsset lives$ $130,555 $— $134,719 
Plant Removal ObligationsPlant Removal ObligationsAsset lives5,556 96,164 98,707 Plant Removal ObligationsAsset lives5,893 96,734 — 98,707 
Fuel Clause AdjustmentsFuel Clause AdjustmentsUp to 1 year6,531 0 10,947 Fuel Clause AdjustmentsUp to 1 year5,692  10,947 — 
Alternative Revenue Program RidersAlternative Revenue Program RidersVarious3,094 1,761 3,581 470 Alternative Revenue Program RidersVarious5,265 2,507 3,581 470 
Pension and Other Postretirement Benefit PlansPension and Other Postretirement Benefit PlansUp to 1 year1,959 0 1,959 Pension and Other Postretirement Benefit PlansUp to 1 year1,959  1,959 — 
Derivative InstrumentsDerivative InstrumentsVarious6,136 787 — — 
OtherOtherVarious161 1,948 176 77 OtherVarious378 150 176 77 
Total Regulatory LiabilitiesTotal Regulatory Liabilities$17,301 $231,766 $16,663 $233,973 Total Regulatory Liabilities$25,323 $230,733 $16,663 $233,973 
1Costs subject to recovery without a rate of return.
1Costs subject to recovery without a rate of return.
1Costs subject to recovery without a rate of return.
2Amount eligible for recovery includes an incentive or rate of return.
2Amount eligible for recovery includes an incentive or rate of return.
2Amount eligible for recovery includes an incentive or rate of return.
6. Short-Term and Long-Term Borrowings
The following is a summary of our outstanding short and long-term borrowings by borrower, Otter Tail Corporation (OTC) or Otter Tail Power Company (OTP), as of JuneSeptember 30, 2021 and December 31, 2020:
Short-Term Debt
The following is a summary of our lines of credit as of JuneSeptember 30, 2021 and December 31, 2020:
June 30, 2021December 31,
2020
September 30, 2021December 31,
2020
(in thousands)(in thousands)Line LimitAmount OutstandingLetters
of Credit
Amount AvailableAmount Available(in thousands)Line LimitAmount OutstandingLetters
of Credit
Amount AvailableAmount Available
OTC Credit AgreementOTC Credit Agreement$170,000 $59,245 $$110,755 $104,834 OTC Credit Agreement$170,000 $36,624 $— $133,376 $104,834 
OTP Credit AgreementOTP Credit Agreement170,000 68,712 12,671 88,617 140,068 OTP Credit Agreement170,000 61,233 13,159 95,608 140,068 
TotalTotal$340,000 $127,957 $12,671 $199,372 $244,902 Total$340,000 $97,857 $13,159 $228,984 $244,902 
BothOn September 30, 2021, OTC entered into a Fourth Amended and Restated Credit Agreement (the OTC Credit Agreement) and OTP entered into a Third Amended and Restated Credit Agreement (the OTP Credit Agreement) amending and restating the previously existing credit agreements to extend the maturity date of each agreement to September 30, 2026. The agreements both provide for $170 million revolving lines of credit to support operations, and borrowings which may be used for working capital needs and other capital requirements, to refinance certain indebtedness and for the issuance of letters of credit in an aggregate not to exceed $40 million for the OTC Credit Agreement and $50 million for the OTP Credit Agreement. Each credit facility includes an accordion provision allowing the borrower to increase the available borrowing capacity, subject to certain terms and conditions. The borrowing capacity of the OTC Credit Agreement can be increased to $290 million and the OTP Credit Agreement can be increased to $250 million. Borrowings under each credit facility are subject to a variable rate of interest on outstanding balances and a commitment fee is applied based on the average unused amount available to be drawn under the respective facility. The variable rate of interest to be charged is based on either LIBOR or a Base Rate, as defined in place until October 31, 2024.



the agreement, selected by the borrower at the time of an advance, subject to the conditions of each agreement, plus an applicable credit spread. The credit spread ranges from 0.125% to 2.00% for the OTC Credit Agreement and from zero to 1.75% for the OTP Credit Agreement, depending on the benchmark interest rate selected and is subject to adjustment
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based on the credit ratings of the borrower. As of September 30, 2021, the weighted-average LIBOR Rate based interest rate was 1.59% and 1.33% under the OTC Credit Agreement and OTP Credit Agreement, respectively.
Each credit facility contains a number of restrictions on the borrower, including restrictions on their ability to merge, sell assets, make investments, create or incur liens on assets, guarantee the obligations of any other party and engage in transactions with related parties. The agreements also contain certain financial and non-financial covenants and defined events of default, and include provisions for the replacement of the LIBOR benchmark rate in the event that LIBOR is no longer available.
Long-Term Debt
The following is a summary of outstanding long-term debt by borrower as of JuneSeptember 30, 2021 and December 31, 2020: 
(in thousands)(in thousands)
EntityEntityDebt InstrumentRateMaturityJune 30,
2021
December 31,
2020
EntityDebt InstrumentRateMaturitySeptember 30,
2021
December 31,
2020
OTCOTCGuaranteed Senior Notes3.55%12/15/26$80,000 $80,000 OTCGuaranteed Senior Notes3.55%12/15/26$80,000 $80,000 
OTPOTPSeries 2011A Senior Unsecured Notes4.63%12/01/21140,000 140,000 OTPSeries 2011A Senior Unsecured Notes4.63%12/01/21140,000 140,000 
OTPOTPSeries 2007B Senior Unsecured Notes6.15%08/20/2230,000 30,000 OTPSeries 2007B Senior Unsecured Notes6.15%08/20/2230,000 30,000 
OTPOTPSeries 2007C Senior Unsecured Notes6.37%08/02/2742,000 42,000 OTPSeries 2007C Senior Unsecured Notes6.37%08/02/2742,000 42,000 
OTPOTPSeries 2013A Senior Unsecured Notes4.68%02/27/2960,000 60,000 OTPSeries 2013A Senior Unsecured Notes4.68%02/27/2960,000 60,000 
OTPOTPSeries 2019A Senior Unsecured Notes3.07%10/10/2910,000 10,000 OTPSeries 2019A Senior Unsecured Notes3.07%10/10/2910,000 10,000 
OTPOTPSeries 2020A Senior Unsecured Notes3.22%02/25/3010,000 10,000 OTPSeries 2020A Senior Unsecured Notes3.22%02/25/3010,000 10,000 
OTPOTPSeries 2020B Senior Unsecured Notes3.22%08/20/3040,000 40,000 OTPSeries 2020B Senior Unsecured Notes3.22%08/20/3040,000 40,000 
OTPOTPSeries 2007D Senior Unsecured Notes6.47%08/20/3750,000 50,000 OTPSeries 2007D Senior Unsecured Notes6.47%08/20/3750,000 50,000 
OTPOTPSeries 2019B Senior Unsecured Notes3.52%10/10/3926,000 26,000 OTPSeries 2019B Senior Unsecured Notes3.52%10/10/3926,000 26,000 
OTPOTPSeries 2020C Senior Unsecured Notes3.62%02/25/4010,000 10,000 OTPSeries 2020C Senior Unsecured Notes3.62%02/25/4010,000 10,000 
OTPOTPSeries 2013B Senior Unsecured Notes5.47%02/27/4490,000 90,000 OTPSeries 2013B Senior Unsecured Notes5.47%02/27/4490,000 90,000 
OTPOTPSeries 2018A Senior Unsecured Notes4.07%02/07/48100,000 100,000 OTPSeries 2018A Senior Unsecured Notes4.07%02/07/48100,000 100,000 
OTPOTPSeries 2019C Senior Unsecured Notes3.82%10/10/4964,000 64,000 OTPSeries 2019C Senior Unsecured Notes3.82%10/10/4964,000 64,000 
OTPOTPSeries 2020D Senior Unsecured Notes3.92%02/25/5015,000 15,000 OTPSeries 2020D Senior Unsecured Notes3.92%02/25/5015,000 15,000 
OTCOTCPACE Note2.54%03/18/210 169 OTCPACE Note2.54%03/18/21 169 
TotalTotal$767,000 $767,169 Total$767,000 $767,169 
Less:Less:Current Maturities Net of Unamortized Debt Issuance Costs139,963 140,087 Less:Current Maturities Net of Unamortized Debt Issuance Costs169,962 140,087 
Unamortized Long-Term Debt Issuance Costs2,497 2,650 Unamortized Long-Term Debt Issuance Costs2,419 2,650 
Total Long-Term Debt Net of Unamortized Debt Issuance CostsTotal Long-Term Debt Net of Unamortized Debt Issuance Costs$624,540 $624,432 Total Long-Term Debt Net of Unamortized Debt Issuance Costs$594,619 $624,432 
On June 10, 2021, OTP entered into a Note Purchase Agreement pursuant to which OTP agreed to issue, in a private placement transaction, $230 million aggregate principal amount of senior unsecured notes consisting of (a) $40 million in aggregate principal amount of its 2.74% Series 2021A Senior Unsecured Notes due November 29, 2031, (b) $100 million in aggregate principal amount of its 3.69% Series 2021B Senior Unsecured Notes due November 29, 2051 and (c) $90 million in aggregate principal amount of its 3.77% Series 2022A Senior Unsecured Notes due May 20, 2052. As of JuneSeptember 30, 2021, there were 0no amounts outstanding. The funding of the notes will occur in 2 issuances, $140.0$140 million in November 2021 and $90.0$90 million in May 2022. The issuance of the notes is subject to the satisfaction of certain customary conditions to closing.
Financial Covenants
Certain of OTC's and OTP's short-term and long-term debt agreements require the borrower, whether OTC or OTP, to maintain certain financial covenants, including a maximum debt to total capitalization ratio of 0.60 to 1.00, a minimum interest and dividend coverage ratio of 1.50 to 1.00, and a maximum level of priority indebtedness. As of JuneSeptember 30, 2021, OTC and OTP were in compliance with these financial covenants.
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7. Pension Plan and Other Postretirement Benefits
Pension Plan
Components of net periodic pension benefit cost for the three and sixnine months ended JuneSeptember 30, 2021 and 2020 are as follows:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Service Cost–Benefit Earned During the PeriodService Cost–Benefit Earned During the Period$1,865 $1,656 $3,731 $3,311 Service Cost–Benefit Earned During the Period$1,866 $1,655 $5,597 $4,966 
Interest Cost on Projected Benefit ObligationInterest Cost on Projected Benefit Obligation2,915 3,263 5,830 6,526 Interest Cost on Projected Benefit Obligation2,915 3,264 8,745 9,790 
Expected Return on AssetsExpected Return on Assets(5,589)(5,505)(11,179)(11,010)Expected Return on Assets(5,590)(5,506)(16,769)(16,516)
Amortization of Net Actuarial Loss:Amortization of Net Actuarial Loss:Amortization of Net Actuarial Loss:
From Regulatory AssetFrom Regulatory Asset2,661 2,231 5,321 4,462 From Regulatory Asset2,660 2,231 7,981 6,693 
From Other Comprehensive IncomeFrom Other Comprehensive Income68 55 136 110 From Other Comprehensive Income68 55 204 165 
Net Periodic Pension CostNet Periodic Pension Cost$1,920 $1,700 $3,839 $3,399 Net Periodic Pension Cost$1,919 $1,699 $5,758 $5,098 
We had no minimum funding requirement as of December 31, 2020 but made a discretionary plan contribution of $10.0 million in January 2021.
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Executive Survivor and Supplemental Retirement Plan (ESSRP)
Components of net periodic pension benefit cost for the three and sixnine months ended JuneSeptember 30, 2021 and 2020 are as follows:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Service Cost–Benefit Earned During the PeriodService Cost–Benefit Earned During the Period$46 $44 $93 $89 Service Cost–Benefit Earned During the Period$47 $45 $140 $134 
Interest Cost on Projected Benefit ObligationInterest Cost on Projected Benefit Obligation307 362 614 724 Interest Cost on Projected Benefit Obligation307 362 921 1,086 
Amortization of Net Actuarial Loss:Amortization of Net Actuarial Loss:Amortization of Net Actuarial Loss:
From Regulatory AssetFrom Regulatory Asset31 24 62 47 From Regulatory Asset30 24 92 71 
From Other Comprehensive IncomeFrom Other Comprehensive Income125 85 249 171 From Other Comprehensive Income124 85 373 256 
Net Periodic Pension CostNet Periodic Pension Cost$509 $515 $1,018 $1,031 Net Periodic Pension Cost$508 $516 $1,526 $1,547 
Other Postretirement Benefits
Components of net periodic postretirement benefit cost for the three and sixnine months ended JuneSeptember 30, 2021 and 2020 are as follows: 
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Service Cost–Benefit Earned During the PeriodService Cost–Benefit Earned During the Period$431 $462 $861 $924 Service Cost–Benefit Earned During the Period$430 $461 $1,291 $1,385 
Interest Cost on Projected Benefit ObligationInterest Cost on Projected Benefit Obligation473 599 946 1,197 Interest Cost on Projected Benefit Obligation472 598 1,418 1,795 
Amortization of Prior Service CostAmortization of Prior Service CostAmortization of Prior Service Cost
From Regulatory AssetFrom Regulatory Asset(1,398)(1,170)(2,795)(2,339)From Regulatory Asset(1,397)(1,169)(4,192)(3,508)
From Other Comprehensive IncomeFrom Other Comprehensive Income(36)(29)(72)(58)From Other Comprehensive Income(35)(28)(107)(86)
Amortization of Net Actuarial LossAmortization of Net Actuarial LossAmortization of Net Actuarial Loss
From Regulatory AssetFrom Regulatory Asset920 1,052 1,840 2,103 From Regulatory Asset919 1,051 2,759 3,154 
From Other Comprehensive IncomeFrom Other Comprehensive Income24 26 47 52 From Other Comprehensive Income24 26 71 78 
Net Periodic Postretirement Benefit CostNet Periodic Postretirement Benefit Cost$414 $940 $827 $1,879 Net Periodic Postretirement Benefit Cost$413 $939 $1,240 $2,818 
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8. Income Taxes
The reconciliation of the statutory federal income tax rate to our effective tax rate for each of the three and sixnine months ended JuneSeptember 30, 2021 and 2020 is as follows:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
20212020202120202021202020212020
Federal Statutory RateFederal Statutory Rate21.0 %21.0 %21.0 %21.0 %Federal Statutory Rate21.0 %21.0 %21.0 %21.0 %
Increases (Decreases) in Tax from:Increases (Decreases) in Tax from:Increases (Decreases) in Tax from:
State Taxes on Income, Net of Federal TaxState Taxes on Income, Net of Federal Tax5.0 5.0 5.0 5.0 State Taxes on Income, Net of Federal Tax5.0 5.0 5.0 5.0 
Production Tax Credits (PTCs)Production Tax Credits (PTCs)(6.3)(6.8)Production Tax Credits (PTCs)(5.0)— (6.0)— 
Amortization of Excess Deferred Income TaxesAmortization of Excess Deferred Income Taxes(2.0)(3.4)(2.4)(3.8)Amortization of Excess Deferred Income Taxes(1.6)(2.9)(2.0)(3.4)
North Dakota Wind Tax Credit Amortization, Net of Federal TaxNorth Dakota Wind Tax Credit Amortization, Net of Federal Tax(0.3)(1.2)(0.3)(1.0)North Dakota Wind Tax Credit Amortization, Net of Federal Tax(0.2)(0.6)(0.3)(0.8)
Excess Tax Deduction on Stock AwardsExcess Tax Deduction on Stock Awards0 (0.6)0 (1.0)Excess Tax Deduction on Stock Awards 0.3  (0.4)
Allowance for Equity Funds Used During ConstructionAllowance for Equity Funds Used During Construction(0.1)(0.8)(0.1)(1.0)Allowance for Equity Funds Used During Construction(0.1)(0.7)(0.1)(0.8)
Other, NetOther, Net(0.8)(1.7)(0.6)(0.6)Other, Net(0.8)(1.9)(0.7)(1.2)
Effective Tax RateEffective Tax Rate16.5 %18.3 %15.8 %18.6 %Effective Tax Rate18.3 %20.2 %16.9 %19.4 %
We began generating PTCs from our Merricourt wind farm placed in service in the fourth quarter of 2020. No PTCs were generated during the sixnine months ended JuneSeptember 30, 2020. Income tax benefits arising from PTCs are offset by corresponding operating revenue reductions.
9. Commitments and Contingencies
Commitments
Construction and Other Purchase Commitments. OTP has commitments under contracts, including its share of construction program and other commitments associated with its jointly-owned facilities, extending into 2046. T.O. Plastics is party to a resin supply agreement under which it must purchase all of a specified class of regrind resin delivered by the supplier at a periodically negotiated price per pound. The agreement expires in 2026.
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Electric Utility Capacity and Energy Requirements and Coal Purchase and Delivery Contracts. OTP has commitments for the purchase of capacity and energy requirements under agreements extending into 2044. OTP also has contracts providing for the purchase and delivery of a significant portion of its current coal requirements, with expiration dates ranging from 2022 through 2040. Certain contracts do not include minimum purchase requirements but do require all coal necessary for the operation of the respective plant to be purchased from the counterparty.
Land Easements. OTP has commitments to make future payments under land easements extending into 2050.
Contingencies
FERC ROE. In November 2013 and February 2015, customers filed complaints with FERC seeking to reduce the ROE component of the transmission rates that MISO transmission owners, including OTP, may collect under the MISO tariff rate. FERC's most recent order, issued on November 19, 2020, adopted a revised ROE methodology and set the base ROE at 10.02% (10.52% with an adder) effective for the fifteen-month period from November 2013 to February 2015 and on a prospective basis beginning in September 2016. The order also dismissed any complaints covering the period from February 2015 to May 2016. The November 2020 opinion is subject to judicial review. We have deferred recognition and recorded a refund liability of $3.5$3.0 million as of JuneSeptember 30, 2021. This refund liability reflects our best estimate of required refunds to customers once all regulatory and judicial proceedings are finalized.completed.
Regional Haze Rule (RHR). The RHR was adopted in an effort to improve visibility in national parks and wilderness areas. The RHR requires states, in coordination with the EPA and other governmental agencies, to develop and implement plans to achieve natural visibility conditions. The second RHR implementation period covers the years 2018-2028, with2018-2028. States are required to submit a state implementation plans targeted for submission to the EPA by July 31, 2021. States are requiredplan to assess reasonable progress with the RHR and determine what additional emission reductions are appropriate, if any.
Coyote Station, OTP's jointly owned coal-fired power plant in North Dakota, is subject to assessment in the second implementation period under the North Dakota state implementation plan. In September 2021, the North Dakota Department of Environmental Quality (NDDEQ) made public a draft of its state implementation plan. The plan concluded it is not reasonable to require additional emission controls during this planning period. Following a consultation and public comment period, and any subsequent modifications to the plan, the NDDEQ will submit its state implementation plan to the EPA for approval.
We cannot predict with certainty the impact the state implementation plan may have on our business until the state implementation plan is finalized and adopted.has been approved or otherwise acted on by the EPA. However, significant emission control investments could be required and the recovery of such costs from customers would require regulatory approval. Alternatively, investments in emission control equipment may prove to be uneconomic and result in a requiredan early retirement of, or the sale of our interest in, Coyote Station.Station, subject to regulatory approval. We cannot estimate the financial effects such a retirement or sale may have on our consolidated operating results, financial position or cash flows, but such amounts could be material and the recovery of such costs from customers would be subject to regulatory approval.
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Westmoreland Coal Company (Westmoreland) Arbitration. In December 2018, insurers for Westmoreland, Westmoreland and its affiliated companies filed an arbitration demand against the co-owners of Coyote Station, including OTP, a 35% co-owner. The claimant insurers are pursuing recovery in the amount of $5.5 million, plus prejudgment interest to recover business interruption insurance proceeds paid to Westmoreland or its affiliates arising from a boiler feed pump explosion in December 2014 at the facility. The explosion and ensuing repairs reduced the amount of coal purchased from a Westmoreland affiliate under an existing coal purchase agreement. The Westmoreland insurers claim the co-owners breached the minimum purchase obligations in the coal purchase agreement. The arbitration was delayed throughAs of September 30, 2021, we have recorded an effortestimated liability for losses to seek dispensationbe incurred related to this matter based upon the most recent information available, however, ultimate losses could be in excess of the amount recorded. Any losses incurred from this matter could be eligible for recovery through the courts and through dispositive motions.typical cost recovery processes of our electric utility business. The arbitration hearing is anticipatedpotential cost recovery would be subject to be held in late 2021.regulatory approval.
Other Contingencies. We are party to litigation and regulatory matters arising in the normal course of business. We regularly analyze relevant information and, as necessary, estimate and record accrued liabilities for legal, regulatory enforcement and other matters in which a loss is probable of occurring and can be reasonably estimated. We believe the effect on our consolidated operating results, financial position and cash flows, if any, for the disposition of all matters pending as of JuneSeptember 30, 2021, other than those discussed above, will not be material.
10. Stockholders' Equity
Registration Statements
On May 3, 2021 we filed a shelf registration statement with the Securities and Exchange Commission (SEC) under which we may offer for sale, from time to time, either separately or together in any combination, equity, debt or other securities described in the shelf registration statement. The registration statement expires in May 2024.
On May 3, 2021, we filed a second registration statement with the SEC for the issuance of up to 1,500,000 common shares under an Automatic Dividend Reinvestment and Share Purchase Plan, which provides shareholders, retail customers of OTP and other interested investors a method of purchasing our common shares by reinvesting their dividends and/or making optional cash investments. Shares purchased under the plan may be new issue common shares or common shares purchased on the open market. The registration statement expires in May 2024.
Dividend Restrictions
Otter Tail Corporation is a holding company with no significant operations of its own. The primary source of funds for payments of dividends to our shareholders is from dividends paid or distributions made by our subsidiaries. As a result of certain statutory limitations or regulatory or financing agreements, restrictions could occur on the amount of distributions allowed to be made by our subsidiaries. Both the OTC Credit Agreement and OTP Credit Agreement contain restrictions on the payment of cash dividends upon a default or event of default, including failure to maintain certain financial covenants. As of JuneSeptember 30, 2021, we were in compliance with these financial covenants.
Under the Federal Power Act, a public utility may not pay dividends from any funds properly included in a capital account. What constitutes “funds properly included in a capital account” is undefined in the Federal Power Act or the related regulations; however, the FERC has consistently interpreted the provision to allow dividends to be paid as long as i) the source of the dividends is clearly disclosed, ii) the dividend is not excessive and iii) there is no self-dealing on the part of corporate officials.
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The MPUC indirectly limits the amount of dividends OTP can pay to the Company by requiring an equity-to-total-capitalization ratio between 47.5% and 58.1% based on OTP’s 2020 capital structure petition effective by order of the MPUC on July 15, 2020. As of JuneSeptember 30, 2021, OTP’s equity-to-total-capitalization ratio including short-term debt was 52.1%52.6% and its net assets restricted from distribution totaled approximately $682.0$674.9 million. Under the 2020 capital structure petition, total capitalization for OTP cannot exceed $1.7 billion.
11. Share-Based Payments
Stock Compensation Expense
Stock-based compensation expense arising from our employee stock purchase plan and share-based compensation plans, recognized within operating expenses in the consolidated statements of income, amounted to $1.3$0.8 million and $1.2$1.3 million for the three months ended JuneSeptember 30, 2021 and 2020, respectively, and $5.5$6.4 million and $4.0$5.3 million for the sixnine months ended JuneSeptember 30, 2021 and 2020, respectively.
Stock Awards. We grant restricted stock awards to members of our Board of Directors and restricted stock units to our employees. The awards vest, depending on award type and recipient, either ratably over periods of three and four years or cliff vest after four years. Vesting is accelerated in certain circumstances, including on retirement. Restricted stock awards granted to members of the Board of Directors are issued and outstanding on grant and carry the same voting and dividend rights of unrestricted outstanding common stock. Restricted stock units are not issued or outstanding on grant and do not provide for voting or dividend rights. Certain restricted stock unit award recipients are eligible to receive dividend equivalent payments during the vesting period, subject to forfeiture under the terms of the agreement.
The grant date fair value of each stock award is determined based on the market price of our common stock on the date of grant adjusted to exclude the value of dividends for those awards that do not receive dividend or dividend equivalent payments during the vesting period.
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The following is a summary of stock award activity for the sixnine months ended JuneSeptember 30, 2021:
SharesWeighted Average
Grant-Date
Fair Value
SharesWeighted Average
Grant-Date
Fair Value
Nonvested, January 1, 2021Nonvested, January 1, 2021128,664 $44.30 Nonvested, January 1, 2021128,664 $44.30 
GrantedGranted57,650 43.10 Granted57,650 43.10 
VestedVested(46,371)43.04 Vested(47,646)42.98 
ForfeitedForfeited(1,577)40.77 Forfeited(2,075)40.95 
Nonvested, June 30, 2021138,366 $44.26 
Nonvested, September 30, 2021Nonvested, September 30, 2021136,593 $44.30 
The fair value of vested awards was $2.1 million and $2.8 million during the sixnine months ended JuneSeptember 30, 2021 and 2020.
Stock Performance Awards. Stock performance awards are granted to executive officers and certain other key employees. The awards vest at the end of a three-year performance period. The number of common shares awarded, if any, at the end of the performance period ranges from 0zero to 150% of the target amount based on two performance measures: i) total shareholder return relative to a peer group and ii) return on equity. The awards have no voting or dividend rights during the vesting period. Vesting of the awards is accelerated in certain circumstances, including on retirement. The amount of common shares awarded on an accelerated vesting is based either on actual performance at the end of the performance period or the amount of common shares earned at target.
The grant date fair value of stock performance awards granted during the sixnine months ended JuneSeptember 30, 2021 and 2020 was determined using a Monte Carlo fair value simulation model incorporating the following assumptions:
20212020
Risk-free interest rate0.18 %1.42 %
Expected term (in years)3.003.00
Expected volatility32.00 %19.00 %
Dividend yield3.60 %2.80 %
The risk-free interest rate was derived from yields on U.S. government bonds of a similar term. The expected term of the award is equal to the three-year performance period. Expected volatility was estimated based on actual historical volatility of our common stock. Dividend yield was estimated based on historic and future yield estimates.
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The following is a summary of stock performance award activity for the sixnine months ended JuneSeptember 30, 2021 (share amounts reflect awards at target):
SharesWeighted Average
Grant-Date
Fair Value
SharesWeighted Average
Grant-Date
Fair Value
Nonvested, January 1, 2021Nonvested, January 1, 2021164,600 $42.32 Nonvested, January 1, 2021164,600 $42.32 
GrantedGranted79,000 38.34 Granted79,000 38.34 
VestedVested(54,000)35.73 Vested(54,000)35.73 
ForfeitedForfeitedForfeited— — 
Nonvested, June 30, 2021189,600 $42.54 
Nonvested, September 30, 2021Nonvested, September 30, 2021189,600 $42.54 
The fair value of vested awards was $2.5 million and $3.4 million during the sixnine months ended JuneSeptember 30, 2021 and 2020.
12. Earnings Per Share
The numerator used in the calculation of both basic and diluted earnings per common share is net income. The denominator used in the calculation of basic earnings per common share is the weighted average number of common shares outstanding during the period. The denominator used in the calculation of diluted earnings per common share is derived by adjusting basic shares outstanding for the dilutive effect of potential common shares outstanding, which consist of time and performance based stock awards and employee stock purchase plan shares.
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The following includes the computation of the denominator for basic and diluted weighted-average shares outstanding for the three and sixnine months ended JuneSeptember 30, 2021 and 2020:
Three Months Ended June 30,Six Months Ended June 30,Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)(in thousands)2021202020212020(in thousands)2021202020212020
Weighted Average Common Shares Outstanding – BasicWeighted Average Common Shares Outstanding – Basic41,500 40,513 41,478 40,365 Weighted Average Common Shares Outstanding – Basic41,504 40,914 41,487 40,548 
Effect of Dilutive Securities:Effect of Dilutive Securities:Effect of Dilutive Securities:
Stock Performance AwardsStock Performance Awards223 97 183 112 Stock Performance Awards262 98 209 107 
Stock AwardsStock Awards75 47 80 56 Stock Awards88 49 82 53 
Employee Stock Purchase Plan Shares and OtherEmployee Stock Purchase Plan Shares and Other20 20 18 28 Employee Stock Purchase Plan Shares and Other15 17 17 25 
Dilutive Effect of Potential Common SharesDilutive Effect of Potential Common Shares318 164 281 196 Dilutive Effect of Potential Common Shares365 164 308 185 
Weighted Average Common Shares Outstanding – DilutedWeighted Average Common Shares Outstanding – Diluted41,818 40,677 41,759 40,561 Weighted Average Common Shares Outstanding – Diluted41,869 41,078 41,795 40,733 
The amount of shares excluded from diluted weighted-average common shares outstanding because such shares were anti-dilutive was not material for the three and sixnine months ended JuneSeptember 30, 2021 and 2020.
13. Derivative Instruments
OTP enters into derivative instruments to manage its exposure to future price variability and reduce volatility in prices for our retail customers. These derivative instruments are not designated as qualifying hedging transactions but provide for an economic hedge against future price variability. The instruments are recorded at fair value on the consolidated balance sheets, with changes in fair value recorded in the consolidated statements of income. However, in accordance with rate-making and cost recovery processes, we recognize a regulatory asset or liability to defer losses or gains from derivative activity until settlement of the associated derivative instrument.
As of JuneSeptember 30, 2021, OTP had outstanding pay fixed, receive variablepay-fixed, receive-variable swap agreements with an aggregate notional amount of 356,200 megawatt-hours of electricity, which will be settled periodically through 2022. As of JuneSeptember 30, 2021, the aggregate fair value of these contracts was $1.9$6.9 million, of which $6.1 million is included in other current assets and $0.8 million is included in other noncurrent assets on the consolidated balance sheets.
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14. Fair Value Measurements
The following tables present our assets measured at fair value on a recurring basis as of JuneSeptember 30, 2021 and December 31, 2020 classified by the input method used to measure fair value:
Level 1Level 2Level 3Level 1Level 2Level 3
June 30, 2021
September 30, 2021September 30, 2021
Investments:Investments:Investments:
Money Market FundsMoney Market Funds$1,861 $ $ Money Market Funds$953 $ $ 
Mutual FundsMutual Funds5,201   Mutual Funds5,170   
Corporate Debt SecuritiesCorporate Debt Securities 2,393  Corporate Debt Securities 2,377  
Government-Backed and Government-Sponsored Enterprises’ Debt SecuritiesGovernment-Backed and Government-Sponsored Enterprises’ Debt Securities 6,835  Government-Backed and Government-Sponsored Enterprises’ Debt Securities 6,831  
Derivative InstrumentsDerivative Instruments 1,879  Derivative Instruments 6,923  
Total AssetsTotal Assets$7,062 $11,107 $ Total Assets$6,123 $16,131 $ 
December 31, 2020December 31, 2020December 31, 2020
Investments:Investments:Investments:
Money Market FundsMoney Market Funds$4,075 $— $— Money Market Funds$4,075 $— $— 
Mutual FundsMutual Funds1,662 — — Mutual Funds1,662 — — 
Corporate Debt SecuritiesCorporate Debt Securities— 2,627 — Corporate Debt Securities— 2,627 — 
Government-Backed and Government-Sponsored Enterprises’ Debt SecuritiesGovernment-Backed and Government-Sponsored Enterprises’ Debt Securities— 6,633 — Government-Backed and Government-Sponsored Enterprises’ Debt Securities— 6,633 — 
Total AssetsTotal Assets$5,737 $9,260 $— Total Assets$5,737 $9,260 $— 
The level 2 fair value measurements for government-backed and government-sponsored enterprises and corporate debt securities are determined on the basis of valuations provided by a third-party pricing service which utilizes industry accepted valuation models and observable market inputs to determine valuation. Some valuations or model inputs used by the pricing service may be based on broker quotes.
The level 2 fair value measurements for derivative instruments are determined by using inputs such as forward electric commodity prices, adjusted for location differences. These inputs are observable in the marketplace throughout the full term of the instrument, can be derived from observable data, or are supported by observable levels at which transactions are executed in the marketplace.
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In addition to assets recorded at fair value on a recurring basis, we also hold financial instruments that are not recorded at fair value in the consolidated balance sheets but for which disclosure of the fair value of these financial instruments is provided. The following reflects the carrying value and estimated fair value of these assets and (liabilities)liabilities as of JuneSeptember 30, 2021 and December 31, 2020:
June 30, 2021December 31, 2020 September 30, 2021December 31, 2020
(in thousands)(in thousands)Carrying
Amount
Fair ValueCarrying
Amount
Fair Value(in thousands)Carrying
Amount
Fair ValueCarrying
Amount
Fair Value
Assets:Assets:
Cash and Cash EquivalentsCash and Cash Equivalents$1,480 $1,480 $1,163 $1,163 Cash and Cash Equivalents$1,272 $1,272 $1,163 $1,163 
TotalTotal1,272 1,272 1,163 1,163 
Liabilities:Liabilities:
Short-Term DebtShort-Term Debt(127,957)(127,957)(80,997)(80,997)Short-Term Debt97,857 97,857 80,997 80,997 
Long-Term DebtLong-Term Debt(764,503)(875,405)(764,519)(858,455)Long-Term Debt764,581 873,632 764,519 858,455 
TotalTotal$862,438 $971,489 $845,516 $939,452 
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash Equivalents: The carrying amount approximates fair value because of the short-term maturity of those instruments.
Short-Term Debt: The carrying amount approximates fair value because the debt obligations are short-term and the balances outstanding are subject to variable rates of interest which reset frequently, a Level 2 fair value input.
Long-Term Debt: The fair value of long-term debt is estimated based on current market indications for borrowings of similar maturities, a Level 2 fair value input.








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ITEM 2.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
You should read the following discussion and analysis of our financial condition and results of operations together with our interim financial statements and the related notes appearing under Item 1 of this Quarterly Report on Form 10-Q, and our annual financial statements and the related notes along with the discussion and analysis of our financial condition and results of operations contained in our Annual Report on Form 10-K for the year ended December 31, 2020.
Otter Tail Corporation and its subsidiaries form a diverse group of businesses with operations classified into three segments: Electric, Manufacturing and Plastics. Our Electric business is a vertically integrated, regulated utility with generation, transmission and distribution facilities to serve our customers in western Minnesota, eastern North Dakota and northeastern South Dakota. Our Manufacturing segment provides metal fabrication for custom machine parts and metal components and manufactures extruded and thermoformed plastic products. Our Plastics segment manufactures PVC pipe for use in, among other applications, municipal and rural water, wastewater, and water reclamation projects.
COVID-19
We continue to monitor the progression of the novel coronavirus (COVID-19) and its impact on our businesses, employees, customers, construction contractors and vendors. As this pandemic continues, we are following the directives and advice of government leaders and medical professionals and have adopted practices to help curtail the spread of the virus and mitigate its impact on our communities, employees, construction contractors, customers and business operations. Our Electric segment business provides a critical service to our customers and our manufacturing businesses provide products and support to critical infrastructure industries. We continue to operate our businesses in a manner that is safe for our employees and our customers.
Beginning in March 2020, COVID-19 and the resulting economic conditions negatively impacted operating results of our Manufacturing segment as customer demand declined significantly in the second quarter of 2020. Sales volumes strengthened in the third and fourth quarters of 2020 due to strong recreational vehicle and lawn and garden end-market demand. Our Electric and Plastics segments operating results were also impacted in 2020. Within our Electric segment, we experienced reduced demand from commercial and industrial customers and increased costs for bad debts. In our Plastics segment, we experienced lower sales volumes in the second quarter of 2020 as distributors of our products reduced inventory levels given the uncertainty of the potential impact of COVID-19. Sales volumes recovered and gross profit margins increased in the third and fourth quarters of 2020, and have continued to increase in 2021, due to increased demand and concerns of supply disruptions.
The impact of COVID-19 and the resulting macroeconomic conditions on our business and financial results began to ease in the first quarter of 2021 and continued to do so through the secondthird quarter of 2021. However, uncertainty remains regarding the magnitude and duration of the pandemic and resulting financial effects. Increased infection rates and any future responses to mitigate the spread of the virus, including any potential vaccination mandates that would apply to our employees, could impact our business and our financial results in future periods.
Recently, the Department of Labor’s Occupational Safety and Health Administration (“OSHA”) drafted an emergency temporary standard requiring all employers with at least 100 employees to ensure their employees are fully vaccinated or require weekly testing for unvaccinated employees. On October 12, 2021, OSHA sent a draft of the standard to the White House regulatory office for approval and it is anticipated to be acted upon soon. Additionally, President Biden issued an executive order on September 9, 2021, which requires employees of certain federal contractors and covered subcontractors to be vaccinated, with no weekly testing option, unless they have an approved disability or religious exemption. We expect one, or both, of these new regulations will apply to at least some, and possibly all, of our businesses. The exact impact the new regulations could have on our companies is uncertain at this time. However, it could result in employee attrition, difficulty fulfilling future labor needs, additional costs related to compliance and may have an adverse effect on our future operating results.
We continue to monitor developments involving our workforce, customers, construction contractors, suppliers and vendors and the financial effects on our business. However, due to the unprecedented and evolving nature of this pandemic, we cannot predict the full extent of the impact COVID-19 will have on our operating results, financial condition and liquidity.
RESOURCE MATERIAL AVAILABILITY AND PRICING
Supply shortages of steel and resin, two key material inputs to our Manufacturing and Plastics segments, respectively, have impacted our operating results in 2021.
Steel supply shortages have arisenarose primarily due to steel mill capacity reductions in 2020 in response to lower steel demand due to COVID-19. Resin shortages arose as a result of production plant shutdowns due to abnormally low temperatures and ice storms in the Gulf Coast region of the United States in the first quarter of 2021. Production and availability of steel and resin have begun to improve as steel mill and resinfacilities have increased production facilities increase their capacities but we anticipate supply constraintsin response to persist through 2021. Thesestrong market demand for steel products. The combination of steel supply shortages haveand strong demand has led to significantly increased prices for steel and resin and limited our production capabilities.
prices. The increase in steel prices has led to increased sale prices for our products at BTD, our metal fabrication business within our Manufacturing segment, as we pass along material cost increases to our customers. In addition, limited steel availability has led to increased complexity in managing our business, including our production schedules, and other increased costs. We anticipate increased steel prices will continue throughout the remainder of 2021 but beginand into 2022.
Resin shortages initially arose as a result of production plant shutdowns due to subsideabnormally low temperatures and ice storms in 2022.
The increasethe Gulf Coast region of the United States in resin prices,the first quarter of 2021 and have been exacerbated by hurricane activity in the third quarter of the year. These supply constraints, along with low pipe inventories and robust domestic and global demand for PVC resin, have led to significantly increased resin prices. The increase in the price of resin, the primary material input into the PVC pipe manufactured by our Plastics segment businesses, along with strong customer demand for PVC pipe and low pipe inventories, due to the resin supply constraints, have led to rapidly increased sales prices for PVC pipe within our Plastics segment.pipe. The increase in sale prices for PVC pipe has outpaced the increase in resin cost increases,costs, leading to expanding gross profit margins and a significant increase in net earnings in our Plastics segment. We anticipate these market dynamics will continue throughoutpersist through the remainder of 2021 but beginand continue during the first half of 2022. We currently expect these conditions to subside beginning in 2022. Accordingly, we do not anticipate Plastics segment earnings in 2022 to remain at current levels given the unique market dynamics present this year.second half of 2022.
The marketplace dynamics impacting both our Manufacturing and Plastics segments are fluid and subject to change which may impact our operating results prospectively.

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RESULTS OF OPERATIONS – QUARTER TO DATE
Provided below is a summary and discussion of our operating results on a consolidated basis followed by a discussion of the operating results of each of our segments,segments: Electric, Manufacturing and Plastics. In addition to the segment results, we provide an overview of our Corporate costs. Our Corporate costs do not constitute a reportable segment but rather consist of unallocated general corporate expenses, such as corporate staff and overhead costs, the results of our captive insurance company and other items excluded from the measurement of segment performance. Corporate costs are added to operating segment totals to reconcile to totals on our consolidated statements of income.
Intersegment transactions were not material in 2021 or 2020 and amounted to less than $0.1 million of operating revenues and operating expenses for each period.
CONSOLIDATED RESULTS    
The following table summarizes consolidated operating results for the three months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$285,608 $192,756 $92,852 48.2 %Operating Revenues$316,294 $235,755 $80,539 34.2 %
Operating ExpensesOperating Expenses225,786 164,847 60,939 37.0 Operating Expenses241,766 183,026 58,740 32.1 
Operating IncomeOperating Income59,822 27,909 31,913 114.3 Operating Income74,528 52,729 21,799 41.3 
Interest ChargesInterest Charges9,555 8,662 893 10.3 Interest Charges9,648 8,568 1,080 12.6 
Nonservice Cost Components of Postretirement BenefitsNonservice Cost Components of Postretirement Benefits624 868 (244)(28.1)Nonservice Cost Components of Postretirement Benefits505 842 (337)(40.0)
Other IncomeOther Income734 2,410 (1,676)(69.5)Other Income203 1,712 (1,509)(88.1)
Income Before Income TaxesIncome Before Income Taxes50,377 20,789 29,588 142.3 Income Before Income Taxes64,578 45,031 19,547 43.4 
Income Tax ExpenseIncome Tax Expense8,308 3,808 4,500 118.2 Income Tax Expense11,824 9,097 2,727 30.0 
Net IncomeNet Income$42,069 $16,981 $25,088 147.7 %Net Income$52,754 $35,934 $16,820 46.8 %
Operating Revenues increased $92.9$80.5 million primarily due to rising PVC pipe prices and increased sales volumes within our Plastics segment and increased volumes and material cost, leading to increased sales prices, in our Manufacturing segment. Retail,Increased transmission services and wholesale revenues, partially offset by decreased retail revenues, within our Electric segment also contributed to higher operating revenues in the secondthird quarter of 2021 compared to the same period last year. See our segment disclosures below for additional discussion of items impacting operating revenues.
Operating Expenses increased $60.9$58.7 million primarily due to increased costs of products sold in our Manufacturing and Plastics segments due to increased raw material costs and higher sales volumes.volumes, as well as increased labor costs. Operating expenses in our Electric segment increased primarily due to higher depreciation and amortization expense arising from our recent rate base investments and higher operating and maintenance expenses. See our segment disclosures below for additional discussion of items impacting operating expenses.
Interest Charges increased $0.9$1.1 million due to interest expense from our $40.0 million long-term debt issuance in August 2020, a higher level of short-term borrowings outstanding in 2021 compared to 2020 and a decrease in capitalized interest in 2021 following the completion and placement in-servicein service of Astoria Station in the first quarter of 2021.
Other Income decreased $1.7$1.5 million primarily due to lower earned equity AFUDC due to the completion and placement in-service of Astoria Station in the first quarter of 2021. During the construction of Astoria Station we earned AFUDC in our Minnesota jurisdiction. Also contributing to the decrease in other income was lower market-based gains on our corporate-owned life insurance policies and other investments in the second quarter of 2021 compared to the same period of 2020.
Income Tax Expense increased $4.5$2.7 million primarily due to increased income before income taxes. Our effective tax rate was 16.5%18.3% in the secondthird quarter of 2021 and 18.3%20.2% in the secondthird quarter of 2020. The decrease in our effective tax rate was driven by PTCs earned in the secondthird quarter of 2021 from our Merricourt wind farm, which was placed in service in the fourth quarter of 2020, partially offset by other permanent differences. See Note 8 to our consolidated financial statements included in this reportQuarterly Report on Form 10-Q for additional information regarding factors impacting our effective tax rate in 2021 and 2020.
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ELECTRIC SEGMENT RESULTS
The following table summarizes Electric segment operating results for the three months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Retail RevenuesRetail Revenues$88,987 $85,553 $3,434 4.0 %Retail Revenues$96,438 $99,605 $(3,167)(3.2)%
Transmission Services RevenuesTransmission Services Revenues11,840 9,673 2,167 22.4 Transmission Services Revenues13,300 12,288 1,012 8.2 
Wholesale RevenuesWholesale Revenues3,260 765 2,495 326.1 Wholesale Revenues6,944 1,500 5,444 362.9 
Other Electric RevenuesOther Electric Revenues2,068 2,162 (94)(4.3)Other Electric Revenues2,093 1,830 263 14.4 
Total Operating Revenue106,155 98,153 8,002 8.2 
Total Operating RevenuesTotal Operating Revenues118,775 115,223 3,552 3.1 
Production FuelProduction Fuel12,164 8,788 3,376 38.4 Production Fuel17,698 11,554 6,144 53.2 
Purchased PowerPurchased Power11,135 13,682 (2,547)(18.6)Purchased Power9,878 13,428 (3,550)(26.4)
Operating and Maintenance ExpensesOperating and Maintenance Expenses36,729 33,179 3,550 10.7 Operating and Maintenance Expenses36,465 32,845 3,620 11.0 
Depreciation and AmortizationDepreciation and Amortization18,153 15,740 2,413 15.3 Depreciation and Amortization17,874 15,647 2,227 14.2 
Property TaxesProperty Taxes4,342 4,168 174 4.2 Property Taxes4,474 4,333 141 3.3 
Operating IncomeOperating Income$23,632 $22,596 $1,036 4.6 %Operating Income$32,386 $37,416 $(5,030)(13.4)%
20212020change% change20212020change% change
Electric kilowatt-hour (kwh) Sales (in thousands)
Electric kilowatt-hour (kwh) Sales (in thousands)
  
Electric kilowatt-hour (kwh) Sales (in thousands)
  
Retail kwh SalesRetail kwh Sales1,086,631 1,033,053 53,578 5.2 %Retail kwh Sales1,076,580 1,075,336 1,244 0.1 %
Wholesale kwh Sales – Company GenerationWholesale kwh Sales – Company Generation104,151 42,140 62,011 147.2 Wholesale kwh Sales – Company Generation174,187 75,884 98,303 129.5 
Heating Degree DaysHeating Degree Days533 635 (102)(16.1)Heating Degree Days3 61 (58)(95.1)
Cooling Degree DaysCooling Degree Days237 170 67 39.4 Cooling Degree Days463 363 100 27.5 
The operating results of our Electric segment are impacted by fluctuations in weather conditions and the resulting demand for electricity for heating and cooling. The following table shows heating and cooling degree days as a percent of normal for the three months ended JuneSeptember 30, 2021 and 2020.
20212020 20212020
Heating Degree DaysHeating Degree Days101.1 %122.1 %Heating Degree Days5.8 %115.1 %
Cooling Degree DaysCooling Degree Days206.1 %156.0 %Cooling Degree Days132.7 %104.6 %
The following table summarizes the estimated effect on diluted earnings per share of the difference in retail kwh sales under actual weather conditions and expected retail kwh sales under normal weather conditions in 2021 and 2020, and between years.
 
2021 vs
Normal
2021 vs
2020
2020 vs
Normal
Effect on Diluted Earnings Per Share$0.03 $— $0.03 
 
2021 vs
Normal
2021 vs
2020
2020 vs
Normal
Effect on Diluted Earnings Per Share$0.03 $0.02 $0.01 
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Retail Revenues increased $3.4decreased $3.2 million primarily due to the following:
A $1.5The recognition of $2.6 million increaseof Minnesota transmission rider revenue in new retail revenuesthe third quarter of 2020 resulting from an interim rate increase in Minnesota, neta favorable judicial decision regarding the state jurisdictional treatment of estimated refunds, effective January 1, 2021 in connection with our rate case filed in November 2020.federally approved transmission projects.
A $1.5 million increase in retail revenue from commercial and industrial customers primarily due to increased demand as volumes improve from 2020, which was negatively impacted by COVID-19.
A $1.4 million increase in revenues primarily related to the recovery of Merricourt and Astoria Station project costs and operating expenses.
Recovery of increased conservation improvement program expenditures as well as increased transmission rider revenues.
These increases in revenue were partially offset by a $2.1$1.2 million decrease in fuel recovery revenues largely due to lower purchased power costs and credits provided to retail customers from increased margins on wholesale sales.sales, but partially offset by increased recovery of higher production fuel costs.
A decrease in revenue from the combination of reduced demand from residential and commercial and industrial customers, exclusive of the impact of weather, net of the effect of a change in customer usage mix.
These decreases in revenue were partially offset by a $1.2 million increase in consumption from the favorable impact of weather in the third quarter of 2021 compared to the same period last year.
Transmission Services Revenues increased $2.2$1.0 million primarily due to higher transmission volume from increased electrical demand as well as increased generator interconnection revenues.
Wholesale Revenues increased $2.5$5.4 million as a result of a 147.2%129.5% increase in wholesale sales volumes and a 72.4%101.7% increase in wholesale prices driven by highincreased fuel costs and market demand for wholesale energy.
Production Fuel costs increased $3.4$6.1 million mainly as a result of a 42.0%41.4% increase in kwhs generated from our fuel-burning plants due to higher demand and favorable prices for energy in wholesale markets. In addition, increased fuel cost per kwh also contributed to higher production fuel costs in the third quarter of 2021.
Purchased Power costs to serve retail customers decreased $2.5$3.6 million primarily due to a 15.7%48.9% decrease in the volume of purchased power as our recent capacity additions provide additional generation resources to serve customer demand.demand and market conditions led to operating our
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existing facilities at higher capacity factors in lieu of purchasing power at higher market prices, but partially offset by an increase in the cost of purchased power per kwh in the third quarter of 2021.
Operating and Maintenance Expense increased $3.6 million mainly due to:
$1.4 million of Merricourt and Astoria Station operating and maintenance expenses incurred in the secondthird quarter of 2021 as these facilities are now commercially operational.
A $0.8$2.1 million increaseof maintenance costs arising from our planned outage at Big Stone plant, which began in transmission tariff expenses.the third quarter of 2021 and we expect will be completed in the fourth quarter of the year.
Other additional expenses includinginclude an increase in conservation improvement program expenditures, which are recovered through retail rates,transmission tariff expense from higher transmission volumes and increased vegetative maintenance expenses and plant maintenance expenses.travel costs as business travel recovers from the impact of COVID-19.
These expense increases were partially offset by, among other items, lower operating costs following the closure of Hoot Lake Plant in May 2021 and lower bad debt expense due to improving customer collections as the economic impact of COVID-19 has eased.
Depreciation and Amortization expense increased $2.4$2.2 million primarily due to Merricourt and Astoria Station being placed in service in the fourth quarter of 2020 and the first quarter of 2021, respectively.
MANUFACTURING SEGMENT RESULTS
The following table summarizes Manufacturing segment operating results for the three months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$84,284 $45,948 $38,336 83.4 %Operating Revenues$89,977 $59,849 $30,128 50.3 %
Cost of Products Sold62,725 36,087 26,638 73.8 
Cost of Products Sold (excluding depreciation)Cost of Products Sold (excluding depreciation)70,148 44,444 25,704 57.8 
Other Operating ExpensesOther Operating Expenses9,735 5,499 4,236 77.0 Other Operating Expenses10,161 6,901 3,260 47.2 
Depreciation and AmortizationDepreciation and Amortization3,844 3,739 105 2.8 Depreciation and Amortization3,794 3,759 35 0.9 
Operating IncomeOperating Income$7,980 $623 $7,357 n/mOperating Income$5,874 $4,745 $1,129 23.8 %
Operating Revenues increased $38.3$30.1 million primarily due to a 41.3% increase in material costs at BTD, which is passed through to customers, as steel prices increased significantly from the previous year. Steel prices have increased sales volumes at BTD. BTD experienced a 52.4%as steel mill production has not matched customer demand as mill capacity recovers from shutdowns in 2020 resulting from the COVID-19 pandemic. A 4.0% increase in sales volumes and $12.0 millionan increase in material costs, which are passed through to customers through increased sales prices. Sales volumes in the second quarter of 2020 were negatively impacted by COVID-19 as customers implemented temporary plant shutdownsscrap revenues, primarily due to higher scrap metal prices, also contributed to the pandemic. Sales volumes in the second quarter of 2021 have rebounded as customer demand across all end markets has been robust. The increase in material costs are largely the result of historically high steel prices due to supply shortages as steel mill capacity rebounds from COVID-19 related capacity reductions in 2020.operating revenues. We anticipate steel prices will remain elevated for the remainder of 2021. Also contributing to the improved financial performance was an increase in scrap revenues primarily due to increased scrap metal prices but also higher volumes,2021 and improved gross profit margins resulting from an increase in production volumes.into 2022. Increased horticultural product sales volumes at T.O. Plastics in 2021, driven by increasing customer demand, as well as increased sales prices also contributed to increased operating revenues in 2021 as compared to 2020.
Cost of Products Sold increased $26.6$25.7 million primarily due to increased volumes and higher material, labor and freight costs at BTD. The increase in material cost is largely driven by increased steel prices as mentioned above. The increaseincreases in sales volumes and production activity in 2021 has led to improved gross profit margins despite the higher labor and freight costs dueand lower productivity resulted in lower gross profit margins compared to increased leveragingthe same period in 2020. Lower productivity during the period was primarily the result of fixed production costs.recent increases in headcount and the time required for new employee to achieve peak productivity. Increased sales volumes and production activity at T.O. Plastics also contributed to the increase in cost of products sold in 2021.
Other Operating Expenses increased $4.2$3.3 million in the secondthird quarter of 2021 compared to 2020. OtherIn the third quarter of 2021 other operating expenses in the second quarter of 2020 were reduced by approximately $2.3 million as a result of initiatives taken to reduce operating costs to mitigate the impact of declining sales volumes from the effects of COVID-19. Other operating expenses in 2021 were impacted by increased incentive based compensation resulting from the improvement in segment financial results, and an increase inother costs necessary to meet the increase insupport higher business volumes.
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PLASTICS SEGMENT RESULTS
The following table summarizes Plastics segment operating results for the three months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$95,169 $48,679 $46,490 95.5 %Operating Revenues$107,542 $60,693 $46,849 77.2 %
Cost of Products Sold59,853 37,747 22,106 58.6 
Cost of Products Sold (excluding depreciation)Cost of Products Sold (excluding depreciation)64,064 42,415 21,649 51.0 
Other Operating ExpensesOther Operating Expenses3,674 2,970 704 23.7 Other Operating Expenses3,832 3,250 582 17.9 
Depreciation and AmortizationDepreciation and Amortization1,112 872 240 27.5 Depreciation and Amortization1,099 905 194 21.4 
Operating IncomeOperating Income$30,530 $7,090 $23,440 330.6 %Operating Income$38,547 $14,123 $24,424 172.9 %
Operating Revenues increased $46.5$46.8 million, primarily due to a 73.9%103.6% increase in the price per pound of PVC pipe sold and a 12.4%sold. The increase in sales volumes. Salessale prices of PVC pipe have rapidly escalated primarilywas largely due to continuedthe combination of PVC resin supply constraints, as resin production facilities recover from plant shutdownswhich has led to limited PVC pipe inventory, and strong demand for PVC pipe products. Resin supply in the third quarter of 2021 was negatively impacted by disruptions caused by Hurricane Ida in the Gulf Coast region, which compounded supply constraints that began in the first quarter of 2021. The undersupply2021 as a result of resin has led to limitedplant shutdowns caused by extreme winter weather. Pounds of pipe inventories acrosssold in the country. In addition, significant global demand for PVC resin has also impacted domestic selling prices.third quarter of 2021 decreased 13.0% from the same period last year. We anticipate sales prices will remain elevated throughthroughout the endremainder of 2021 and into 2022, as resin suppliers work to fulfill purchase allotments and pipe manufacturers continue to replenish depleted inventories while customer demand remains strong. Sales volumes in the second quarter of 2020 were negatively impacted by COVID-19 as distributors reduced inventory levels due to the uncertainty over the impact of the pandemic.
Cost of Products Sold increased $22.1$21.6 million primarily due to increased PVC resin and other input material costs as described above. The 12.4% increaseper pound, which increased 91.7% compared to the same period in sales volumesthe previous year. Increases in labor and freight costs in 2021 also contributed to the increase in cost of products sold.
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Other Operating Expenses increased $0.7$0.6 million primarily as a result of an increase in variable costs associated with the increased incentive based compensation cost directly related to increased segment profitability.financial results in 2021.
CORPORATE COSTS
The following table summarizes Corporate operating results for the three months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Other Operating ExpensesOther Operating Expenses$2,260 $2,315 $(55)(2.4)%Other Operating Expenses$2,231 $3,471 $(1,240)(35.7)%
Depreciation and AmortizationDepreciation and Amortization60 85 (25)(29.4)Depreciation and Amortization48 84 (36)(42.9)
Operating LossOperating Loss$2,320 $2,400 $(80)(3.3)%Operating Loss$2,279 $3,555 $(1,276)(35.9)%
Other Operating Expenses decreased $1.2 million primarily due to decreased stock and incentive based compensation cost as a result of the timing of expense recognition, which can fluctuate due to changes in estimates of annual financial performance relative to targeted amounts.
RESULTS OF OPERATIONS – YEAR TO DATE
Intersegment transactions were not material in 2021 or 2020 and amounted to less than $0.1 million of operating revenues and operating expenses for each period.
CONSOLIDATED RESULTS
The following table summarizes consolidated operating results for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$547,318 $427,503 $119,815 28.0 %Operating Revenues$863,612 $663,258 $200,354 30.2 %
Operating ExpensesOperating Expenses443,297 360,305 82,992 23.0 Operating Expenses685,063 543,331 141,732 26.1 
Operating IncomeOperating Income104,021 67,198 36,823 54.8 Operating Income178,549 119,927 58,622 48.9 
Interest ChargesInterest Charges18,953 16,785 2,168 12.9 Interest Charges28,601 25,353 3,248 12.8 
Nonservice Cost Components of Postretirement BenefitsNonservice Cost Components of Postretirement Benefits1,006 1,739 (733)(42.2)Nonservice Cost Components of Postretirement Benefits1,511 2,581 (1,070)(41.5)
Other IncomeOther Income1,892 2,021 (129)(6.4)Other Income2,095 3,733 (1,638)(43.9)
Income Before Income TaxesIncome Before Income Taxes85,954 50,695 35,259 69.6 Income Before Income Taxes150,532 95,726 54,806 57.3 
Income Tax ExpenseIncome Tax Expense13,556 9,446 4,110 43.5 Income Tax Expense25,380 18,543 6,837 36.9 
Net IncomeNet Income$72,398 $41,249 $31,149 75.5 %Net Income$125,152 $77,183 $47,969 62.1 %
Operating Revenues increased $119.8$200.4 million primarily due to higher PVC pipe prices and sales volumes within our Plastics segment and increased volumes and material costs, leading to higher sales prices, in our Manufacturing segment. Retail,Increased transmission services and wholesale revenue withrevenues within our Electric segment also contributed to the higher operating revenues in 2021. See our segment disclosures below for additional discussion of items impacting operating revenues.
Operating Expenses increased $83.0$141.7 million in 2021 primarily due to increased costs of products sold in our Plastics and Manufacturing segments due to higher raw material costs and sales volumes. Operating expenses in our Electric segment increased primarily from higher operating and maintenance and depreciation and amortization expenses, in each case largely the result of our recent rate base investments and the associated operating costs of such investments. See our segment disclosures below for additional discussion of items impacting operating expenses.
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Interest Charges increased $2.2$3.2 million in 2021 due to a debt issuance in our Electric segment in the third quarter of 2020, increased outstanding borrowings under our short-term debt arrangements, both of which were largely used to finance rate base investments in our Electric segment, and a decrease in capitalized interest in 2021 due to the completion and placement in service of Astoria Station in the first quarter of 2021.
Nonservice Cost Components of Postretirement Benefits decreased $0.7$1.1 million in 2021 due to a change in how prescription drug coverage is provided to retirees and the impact of nonservice costs from a decrease in the discount rate from 2020 to 2021.
Other Income decreased $0.1$1.6 million in 2021 due to a $1.6$2.7 million decrease in earned equity AFUDC due primarily to the completion and placement in service of Astoria Station in the first quarter of 2021, but largelypartially offset by increases in the values of corporate-owned life insurance policies and other investments in 2021 compared to 2020.
Income Tax Expense increased $4.1$6.8 million in 2021 primarily due to increased income before income taxes. Our effective tax rate was 15.8%16.9% in 2021 and 18.6%19.4% in 2020 with the decrease primarily driven by PTCs earned in 2021 from our Merricourt wind farm, which was placed in service in the fourth quarter of 2020. See Note 8 to our consolidated financial statements included in the report on Form 10-Q for additional information regarding factors impacting our effective tax rate.
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ELECTRIC SEGMENT RESULTS
The following table summarizes Electric segment operating results for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Retail RevenuesRetail Revenues$194,693 $192,156 $2,537 1.3 %Retail Revenues$291,130 $291,761 $(631)(0.2)%
Transmission Services RevenuesTransmission Services Revenues23,785 20,514 3,271 15.9 Transmission Services Revenues37,085 32,802 4,283 13.1 
Wholesale RevenuesWholesale Revenues7,767 1,641 6,126 373.3 Wholesale Revenues14,711 3,141 11,570 368.4 
Other Electric RevenuesOther Electric Revenues3,610 3,718 (108)(2.9)Other Electric Revenues5,703 5,548 155 2.8 
Total Operating Revenue229,855 218,029 11,826 5.4 
Total Operating RevenuesTotal Operating Revenues348,629 333,252 15,377 4.6 
Production FuelProduction Fuel26,878 22,523 4,355 19.3 Production Fuel44,576 34,077 10,499 30.8 
Purchased PowerPurchased Power30,395 32,512 (2,117)(6.5)Purchased Power40,273 45,940 (5,667)(12.3)
Operating and Maintenance ExpensesOperating and Maintenance Expenses78,150 73,794 4,356 5.9 Operating and Maintenance Expenses114,615 106,639 7,976 7.5 
Depreciation and AmortizationDepreciation and Amortization35,461 31,416 4,045 12.9 Depreciation and Amortization53,335 47,063 6,272 13.3 
Property TaxesProperty Taxes8,662 8,268 394 4.8 Property Taxes13,136 12,601 535 4.2 
Operating IncomeOperating Income$50,309 $49,516 $793 1.6 %Operating Income$82,694 $86,932 $(4,238)(4.9)%
Electric kilowatt-hour (kwh) Sales (in thousands)
Electric kilowatt-hour (kwh) Sales (in thousands)
  
Electric kilowatt-hour (kwh) Sales (in thousands)
  
Retail kwh SalesRetail kwh Sales2,435,150 2,462,963 (27,813)(1.1)%Retail kwh Sales3,511,730 3,538,299 (26,569)(0.8)%
Wholesale kwh Sales – Company GenerationWholesale kwh Sales – Company Generation184,574 81,064 103,510 127.7 Wholesale kwh Sales – Company Generation358,761 156,948 201,813 128.6 
Heating Degree DaysHeating Degree Days3,611 3,907 (296)(7.6)Heating Degree Days3,614 3,968 (354)(8.9)
Cooling Degree DaysCooling Degree Days237 170 67 39.4 Cooling Degree Days700 533 167 31.3 
The operating results of our Electric segment are impacted by fluctuations in weather conditions and the resulting demand for electricity for heating and cooling. The following table shows heating and cooling degree days as a percent of normal for the sixnine months ended JuneSeptember 30, 2021 and 2020.
20212020 20212020
Heating Degree DaysHeating Degree Days91.0 %99.1 %Heating Degree Days89.9 %99.3 %
Cooling Degree DaysCooling Degree Days206.1 %156.0 %Cooling Degree Days150.9 %116.9 %
The following table summarizes the estimated effect on diluted earnings per share of the difference in retail kwh sales under actual weather conditions and expected retail kwh sales under normal weather conditions in 2021 and 2020, and between years.
 
2021 vs
Normal
2021 vs
2020
2020 vs
Normal
Effect on Diluted Earnings Per Share$— $(0.01)$0.01 
 
2021 vs
Normal
2021 vs
2020
2020 vs
Normal
Effect on Diluted Earnings Per Share$0.02 $0.01 $0.01 
Retail Revenues increased $2.5decreased $0.6 million primarily due to the following:
A $3.7$4.7 million decrease in fuel recovery revenues largely due to lower purchased power costs and credits provided to retail customers from increased margins on wholesale sales, but partially offset by increased recovery of higher production fuel costs.
The recognition of $2.6 million of Minnesota transmission rider revenue in the third quarter of 2020 resulting from a favorable judicial decision regarding the state jurisdictional treatment of federally approved transmission projects.
A $1.6 million decrease in revenue from the combination of reduced demand from residential and commercial and industrial customers, exclusive of the impact of weather, net of the effect of a change in customer usage mix.
These decreases in revenue were partially offset by the following:
A $3.6 million increase in rider revenues primarily related to the recovery of Merricourt and Astoria Station project costs and operating expenses.
A $3.0 million increase in new retail revenuesrevenue from an interim rate increase in Minnesota, net of estimated refunds, effective January 1, 2021 in connection with our rate case filed in November 2020.
A $3.0$2.1 million increase in revenue from transmission rider revenues primarily relatedrecovery, due to the recovery of Merricourt operating expensesincreased transmission investments, and Astoria Station project costs.
A $1.5 million increase in rider revenue for the recovery of increased conservation improvement program spending.
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These increases in revenue were partially offset by the following:
A $3.5 million decrease in fuel recovery revenues largely due to credits provided to customers from increased margins on wholesale sales.
A $2.2 million decrease in retail revenues from lower demand, including a $0.7 million impact from milder weather in 2021 compared with 2020. Retail sales volumes were lower in the first quarter of 2021 as compared to the first quarter of 2020 due to the ongoing impacts of COVID-19.
Transmission Services Revenues increased $3.3$4.3 million primarily due to increased recovery of higher transmission volume from increasing electrical demandcosts and increased transmission investment as well as increased generator interconnection revenues.
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Wholesale Revenues increased $6.1$11.6 million as a result of a 127.7%128.6% increase in wholesale sales volumes and a 107.9%104.9% increase in wholesale electric prices, primarily driven by increased fuel costs and high market demand and availability constraints during February of 2021,for wholesale energy, which droveserves to drive up spot market prices for electricity.
Production Fuel costs increased $4.4$10.5 million primarily as a result of a 25.4%30.8% increase in kwhs generated from our fuel-burning plants due to higher demand and favorable prices for energy in wholesale markets.
Purchased Power costs to serve retail customers decreased $2.1$5.7 million mainly due to a 17.5%26.7% decrease in the volume of purchased power as our recent capacity additions provide additional generation resources to serve customer demand.demand and market conditions led to operating our existing facilities at higher capacity factors in lieu of purchasing power at higher market prices.
Operating and Maintenance Expense increased $4.4$8.0 million, which was primarily the result of:
$2.64.0 million of Merricourt and Astoria Station operating and maintenance expenses incurred in 2021 as these facilities are now commercially operational.
A $1.5$2.1 million increaseof maintenance costs arising from our planned outage at Big Stone plant, which began in conservation improvement program expenditures, which are recovered through retail rates.the third quarter of 2021 and we expect will be completed in the fourth quarter of the year.
Other additional costs including a $1.0$1.6 million increase in transmission tariff expenses, a $1.0 million increase in vegetative maintenance cost, and increased compensation and insurance costs.an increase in conservation program expenditures.
These expense increases were partially offset by, among other items, $1.7 million of lower bad debt expense due to improving customer collections as the economic impact of COVID-19 has eased.eased and lower operating costs following the closure of Hoot Lake Plant in May 2021.
Depreciation and Amortization expense increased $4.0$6.3 million primarily due to Merricourt and Astoria Station being placed in service in the fourth quarter of 2020 and in February 2021, respectively.
MANUFACTURING SEGMENT RESULTS
The following table summarizes Manufacturing segment operating results for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$160,107 $114,427 $45,680 39.9 %Operating Revenues$250,085 $174,276 $75,809 43.5 %
Cost of Products Sold119,036 86,701 32,335 37.3 
Cost of Products Sold (excluding depreciation)Cost of Products Sold (excluding depreciation)189,183 131,145 58,038 44.3 
Other Operating ExpensesOther Operating Expenses17,946 12,777 5,169 40.5 Other Operating Expenses28,109 19,678 8,431 42.8 
Depreciation and AmortizationDepreciation and Amortization7,601 7,485 116 1.5 Depreciation and Amortization11,395 11,244 151 1.3 
Operating IncomeOperating Income$15,524 $7,464 $8,060 108.0 %Operating Income$21,398 $12,209 $9,189 75.3 %
Operating Revenues increased $45.7$75.8 million primarily due to higher revenues at BTD, which was largely driven by a 21.7%15.6% increase in sales volumes and a $16.4 million25.5% increase in material costs, which are passed through to customers through increased sales prices. Sales volumes in the second quarter of 2021 were impacted by strong end market demand in most markets served after recovering from significantly lower volumes in the second quarter of 2020 due to the effects of the COVID-19 pandemic. The increase in material costs is largely the result of historically high steel prices due to supply shortages as steel mill capacity rebounds from capacity reductions in 2020. Sales volumes in 2020 were negatively impacted by COVID-19 as customers implemented temporary plant shutdowns due to the pandemic. Sales volumes in 2021 have rebounded as customer demand across most end markets has been robust. An increase in horticultural product sales volumes at T.O. Plastics in 2021, driven by increasing customer demand, hasas well as increased sales prices, also contributed to increased operating revenues in 2021.
Cost of Products Sold increased $32.3$58.0 million primarily due to increased volumes and higher material, labor and freight costs at BTD. The increase in material cost is largely the result of high steel prices as mentioned above. GrossYear to date gross profit margins have improvedare consistent with the prior year as increases in 2021, despite the higher labor and freight costs and lower productivity in the third quarter of 2021 have been offset by higher sales volumes, as higher production activitiesvolumes have resulted in greater leveraging of fixed production costs. Increased sales volumes and production activity at T.O. Plastics has also contributed to the increase in cost of products sold in 2021. Year to date gross profit margins at T.O. Plastics increased compared to the same period in 2020, as higher production activities have resulted in greater leveraging of fixed production costs and sales prices have increased, resulting from input material cost inflation.
Other Operating Expenses increased $5.2$8.4 million in 2021 compared to 2020. Other operating expenses in 2020 were reduced by $2.5 million as a result of initiatives taken to reduce costs in an effort to mitigate the impact of declining sales volumes from the effects of COVID-19. Other operating expenses in 2021 were impacted by increasedan increase in incentive based compensation arising from the improvement in financial results, and an increase in costs necessary to support the increase in business volumes.
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PLASTICS SEGMENT RESULTS
The following table summarizes Plastics segment operating results for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Operating RevenuesOperating Revenues$157,356 $95,076 $62,280 65.5 %Operating Revenues$264,898 $155,769 $109,129 70.1 %
Cost of Products Sold105,519 73,017 32,502 44.5 
Cost of Products Sold (excluding depreciation)Cost of Products Sold (excluding depreciation)169,584 115,432 54,152 46.9 
Other Operating ExpensesOther Operating Expenses6,619 5,740 879 15.3 Other Operating Expenses10,450 8,990 1,460 16.2 
Depreciation and AmortizationDepreciation and Amortization2,102 1,762 340 19.3 Depreciation and Amortization3,200 2,667 533 20.0 
Operating IncomeOperating Income$43,116 $14,557 $28,559 196.2 %Operating Income$81,664 $28,680 $52,984 184.7 %
Operating Revenues increased $62.3$109.1 million, primarily due to a 54.8%71.1% increase in the price per pound of PVC pipe sold and a 6.9% increase in sales volumes.sold. As discussed above, sale prices have rapidly increased in 2021 principally due to the combination of PVC resin supply constraints, following production plant shutdowns and feedstock shortages arising from abnormally low temperatures and ice storms in the Gulf Coast region of the United States in February 2021. Resin supply shortages havewhich has led to limited PVC pipe inventories across the country. Increased globalinventory, and strong demand for PVC resinpipe products. Resin supply constraints has also contributed to rising domestic prices. Salesimpacted our production and sales volumes in the second quarter of 2020 were negatively impacted by COVID-19 as distributors reduced inventory levels duedown slightly compared to the uncertainty over the impact of the pandemic.previous year.
Cost of Products Sold increased $32.5$54.2 million primarily due to increased PVC resin and other input costs, as described above. The 6.9% increasewhich increased 60.3% compared to the same period in sales volumesthe previous year. Increases in labor and freight costs in 2021 also contributed to the increase in cost of products sold.
Other Operating Expenses increased $0.9$1.5 million largely due toas a result of an increase in variable costs associated with increased incentive based compensation costs resulting from increased segment operating results.financial results in 2021.
CORPORATE COSTS
The following table summarizes Corporate operating results for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020$ change% change(in thousands)20212020$ change% change
Other Operating ExpensesOther Operating Expenses$4,797 $4,167 $630 15.1 %Other Operating Expenses$7,028 $7,638 $(610)(8.0)%
Depreciation and AmortizationDepreciation and Amortization131 172 (41)(23.8)Depreciation and Amortization179 256 (77)(30.1)
Operating LossOperating Loss$4,928 $4,339 $589 13.6 %Operating Loss$7,207 $7,894 $(687)(8.7)%
Other Operating Expenses increaseddecreased $0.6 million primarily due to increased incentive based compensation cost as a result of increased consolidated earnings.net decreases in corporate overhead and operating costs.
REGULATORY RATE MATTERS
The following provides a summary of general rate case filings, and rate rider filings and other regulatory filings that have or are expected to have a material impact on our operating results, financial position or cash flows.
GENERAL RATES
Minnesota Rate Case: On November 2, 2020, OTP filed a request with the MPUC for an increase in revenue recoverable under generalthrough base rates in Minnesota. In its filing, OTP requested a net increase in annual revenue of approximately $14.5 million, or 6.77%, based on an allowed rate of return on rate base of 7.59% and an allowed rate of return on equity of 10.20% on an equity ratio of 52.5% of total capital. Through this proceeding, OTP has proposed changes to the mechanism of cost recovery, with some costs moving from riders into base rates and fuel, purchased power, and conservation program costs moving out of base rates and into riders. The filing also included a revenue decoupling mechanism proposal. Such mechanisms are designed to separate a utility's revenue from changes in energy sales. The decoupling mechanism uses a tracker balance inthrough which authorized customer margins are subject to a true-up mechanism to maintain or cap a given level of revenues.
On December 3, 2020, the MPUC approved an interim annual rate increase of $6.9 million, or 3.2%, effective January 1, 2021. This approval was provided after an alternative recovery proposal was submitted by OTP, which, among other changes, requested the extension of depreciable lives of certain wind-related assets and deferred certain cost recovery decisions to the final rate determination. In the aggregate, this alternative recovery proposal reduced operating costs and delayed recovery of certain other costs by approximately $7.0 million to lessen the interim rate impact on customers.
In a filing submitted to the MPUC on April 30, 2021, OTP lowered its requested net annual revenue increase from its initial request of $14.5 million to $8.2 million, primarily due to a reduction in operating costs from amounts included in its November 2020 filing. The cost reductions include, among other items, lower depreciation expense on our wind generation assets due to the extension of depreciable lives from 25 to 35 years and a reduction in postretirement benefit costs.
On September 20, 2021, the Administrative Law Judge assigned to our rate case issued his recommendations to the MPUC, and the MPUC is expected to hold deliberations in early November with a written order expected to be issued by the end of January 2022. We anticipate final rates will be implemented by mid-2022.
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RATE RIDERS
The following table includes a summary of pending and recently concluded rate rider proceedings:
RecoveryRecoveryFilingAmountEffectiveRecoveryFilingAmountEffective
MechanismMechanismJurisdictionStatusDate(in millions)DateNotesMechanismJurisdictionStatusDate(in millions)DateNotes
RRRRRR2019MNApproved06/21/19$12.5 01/01/20Includes return on Merricourt construction costs.RRR2019MNApproved06/21/19$12.5 01/01/20Includes return on Merricourt construction costs.
TCRTCR2018MNApproved05/07/2010.3 01/21/20See below for additional details.TCR2018MNApproved05/07/2010.3 01/21/20See below for additional details.
EUICEUIC2021MNRequested06/07/211.3 01/01/22Includes recovery of new infrastructure costs, including advanced metering, outage management and demand response systems.EUIC2021MNRequested06/07/211.3 01/01/22Includes recovery of new infrastructure costs, including advanced metering, outage management and demand response systems.
RRRRRR2021NDApproved03/07/2111.804/01/21Includes return on Merricourt construction costs.RRR2021NDApproved03/07/2111.804/01/21Includes return on Merricourt construction costs.
GCRGCR2020NDApproved06/10/206.2 07/01/20Includes return on Astoria Station construction costs.GCR2020NDApproved06/10/206.2 07/01/20Includes return on Astoria Station construction costs.
TCRTCR2022NDRequested09/15/216.1 01/01/22Includes recovery of three new transmission projects/programs.
RRRRRR2020NDApproved03/18/205.8 04/01/20Includes return on Merricourt construction costs.RRR2020NDApproved03/18/205.8 04/01/20Includes return on Merricourt construction costs.
TCRTCR2020NDApproved08/31/205.6 01/21/20Includes recovery of new transmission assets.TCR2020NDApproved08/31/205.6 01/21/20Includes recovery of new transmission assets.
TCRTCR2021NDApproved11/18/205.601/01/21Includes recovery of eight new transmission projects.TCR2021NDApproved11/18/205.601/01/21Includes recovery of eight new transmission projects.
GCRGCR2021NDApproved03/01/215.207/01/21Includes recovery of Astoria Station, net of anticipated savings associated with the retirement of Hoot Lake Plant.GCR2021NDApproved03/01/215.207/01/21Includes recovery of Astoria Station, net of anticipated savings associated with the retirement of Hoot Lake Plant.
TCRTCR2020SDApproved01/29/202.303/02/20Annual update to transmission cost recovery rider.TCR2020SDApproved01/29/202.303/02/20Annual update to transmission cost recovery rider.
TCRTCR2021SDApproved02/19/212.203/01/21Includes recovery of two new transmission projects.TCR2021SDApproved02/19/212.203/01/21Includes recovery of two new transmission projects.
PIRPIR2020SDApproved05/31/201.609/01/20Includes return on Merricourt and Astoria Station construction costs.PIR2020SDApproved05/31/201.609/01/20Includes return on Merricourt and Astoria Station construction costs.
Minnesota TCR. On May 1, 2017, the MPUC ordered OTP to include in the TCR rider retail rate base the Minnesota jurisdictional share of OTP's investments in certain transmission assets and all revenues received from other utilities under MISO's tariffed rates as a credit in its TCR revenue requirement calculations. The order had the effect of diverting interstate wholesale revenues that have been approved by the FERC to offset the FERC-approved expenses, effectively reducing OTP's recovery of FERC-approved expense levels.
On August 18, 2017, OTP filed an appeal of the MPUC order with the Minnesota Court of Appeals to contest the portion of the order requiring OTP to jurisdictionally allocate costs of the FERC transmission projects in the TCR rider. On June 11, 2018, the Minnesota Court of Appeals reversed the MPUC's order. On July 11, 2018, the MPUC filed a petition for review of the decision to the Minnesota Supreme Court, which granted review of the appellate court decision. The Minnesota Supreme Court issued its opinion on April 22, 2020, concluding the MPUC lacked authority to amend an existing TCR rider approved under Minnesota state law to include the costs and revenues associated with these transmission projects and affirming the decision of the Minnesota Court of Appeals.
On October 22, 2020, the MPUC approved OTP's request for a Minnesota TCR rider update with the exclusion of these transmission projects. In addition, the MPUC approved the inclusion of three new projects previously requested in the Minnesota TCR rider eligibility petition. Updated rates went into effect in January 2021. With this decision, one-half of the projected TCR rider tracker balance at December 2020 of $13.4 million will be included in the 2021 TCR rider annual revenue requirement, with the remainder included in the next annual update. The annual updates provide for recovery of approximately $2.6 million in MISO revenues credits to Minnesota customers through the TCR rider prior to September 30, 2020. As a result, OTP recognized additional rider revenue of $2.6 million during the third quarter of 2020.
INTEGRATED RESOURCE PLAN
Minnesota law requires utilities to submit to the MPUC for approval a 15-year advance IRP. A resource plan is a set of resource options a utility could use to meet the service needs of its customers over a forecast period, including an explanation of the utility’s supply and demand circumstances, and the extent to which each resource option would be used to meet those service needs. Typically, the filings are submitted every two years.
On September 1, 2021, OTP filed its 2022 IRP concurrently with regulators in the three states where OTP operates, Minnesota, North Dakota and South Dakota. The 2022 IRP includes OTP’s preferred plan for meeting customers’ anticipated capacity and energy needs while maintaining system reliability and low electric service rates.
The components of OTP's preferred plan include:
the addition of dual fuel capability at our Astoria Station natural gas plant, allowing for the plant to burn fuel oil in addition to natural gas;
the addition of 150 megawatts of solar generation in 2025;
the addition of 100 megawatts of wind generation in 2027;
the commencement of the process of withdrawing from our 35 percent ownership interest in Coyote Station, a jointly owned, coal-fired generation plant, by December 31, 2028; and
the addition of 50 megawatts of solar generation in 2033.
The 2022 IRP requests approval for certain activities planned to commence within the next five years, which include the addition of dual fuel capacity at our Astoria Station natural gas plant, the addition of 150 megawatts of solar generation, and the withdrawal from our ownership interest in Coyote Station.
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The preferred plan proposes to, subject to regulatory approval, create a regulatory asset as a vehicle to recover costs related to the future withdrawal from Coyote Station, including the net book value of the plant on the withdrawal date, anticipated decommissioning costs, and any costs incurred if a termination of the existing lignite sales agreement under which Coyote Station acquires all of its lignite coal fuel from a nearby mine is necessary. For its economic analysis, OTP developed an estimate of the reasonably foreseeable costs of withdrawing from Coyote Station at the end of 2028 of $68.5 million. These costs may differ from actual results due to the uncertainty and timing of future events associated with the terms and conditions of a withdrawal.
LIQUIDITY
LIQUIDITY OVERVIEW
We believe our financial condition is strong and our cash, other liquid assets, operating cash flows, existing lines of credit, access to capital markets, and borrowing ability because of investment-grade credit ratings, when taken together, provide us ample liquidity to conduct our business operations and fund our capital expenditure plans. Our liquidity, including our operating cash flows and access to capital markets, can be impacted by macroeconomic factors outside of our control, such as those which may be caused by COVID-19. In addition, our liquidity could be impacted by non-compliance with covenants under our various debt instruments. As of JuneSeptember 30, 2021, we were in compliance with all debt covenants (see the Financial Covenants section under Capital Resources below).
The following table presents the status of our lines of credit as of JuneSeptember 30, 2021 and December 31, 2020:
2021202020212020
(in thousands)(in thousands)Line LimitAmount OutstandingLetters
of Credit
Amount AvailableAmount Available(in thousands)Line LimitAmount OutstandingLetters
of Credit
Amount AvailableAmount Available
OTC Credit AgreementOTC Credit Agreement$170,000 $59,245 $— $110,755 $104,834 OTC Credit Agreement$170,000 $36,624 $— $133,376 $104,834 
OTP Credit AgreementOTP Credit Agreement170,000 68,712 12,671 88,617 140,068 OTP Credit Agreement170,000 61,233 13,159 95,608 140,068 
TotalTotal$340,000 $127,957 $12,671 $199,372 $244,902 Total$340,000 $97,857 $13,159 $228,984 $244,902 
We have an internal risk tolerance metric to maintain a minimum of $50 million of liquidity under the OTC Credit Agreement. Should additional liquidity be needed, this agreement includes an accordion feature allowing us to increase the amount available to $290 million, subject to certain
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terms and conditions. The OTP Credit Agreement also includes an accordion feature allowing OTP to increase that facility to $250 million, subject to certain terms and conditions.
CASH FLOWS
The following is a discussion of our cash flows for the sixnine months ended JuneSeptember 30, 2021 and 2020:
(in thousands)(in thousands)20212020(in thousands)20212020
Net Cash Provided by Operating ActivitiesNet Cash Provided by Operating Activities$68,574 $73,901 Net Cash Provided by Operating Activities$154,752 $141,276 
Net Cash Provided by Operating Activities decreased $5.3increased $13.5 million for the sixnine months ended JuneSeptember 30, 2021 compared to the sixnine months ended JuneSeptember 30, 2020. AnThe increase in net income in 2021cash provided by operating activities was more thanthe result of increased earnings during the year, which was partially offset by an increase inincreased working capital requirements.needs. Our level of working capital increased year over year, and was impacted by increased accounts receivables within our Manufacturing and Plastics segments, due to strong sales volumes and significantly increased sales prices in 2021, and higher inventory levels within our Manufacturing segment due to higher production volumes and increased material costs in 2021, but partially offset by increased accounts payable due to higher production volumes and increased costs in our Manufacturing and Plastics segments in 2021. We made a discretionary contribution to our pension plan of $10.0 million in the sixnine months ended JuneSeptember 30, 2021 compared to a contribution of $11.2 million in 2020.
(in thousands)(in thousands)20212020(in thousands)20212020
Net Cash Used in Investing ActivitiesNet Cash Used in Investing Activities$76,403 $121,005 Net Cash Used in Investing Activities$117,084 $222,385 
Net Cash Used in Investing Activities decreased $44.6$105.3 million for the sixnine months ended JuneSeptember 30, 2021 compared to the sixnine months ended JuneSeptember 30, 2020. The decrease is primarily the result of lower capital investment within our Electric segment as capital spending on our large generation assets, Merricourt and Astoria Station, wereoccurred throughout 2020 and was largely completed inby the fourth quarter of 2020.
(in thousands)20212020
Net Cash Provided by Financing Activities$8,146 $65,417 
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(in thousands)20212020
Net Cash (Used in) Provided by Financing Activities$(37,559)$104,814 
Net Cash (Used in) Provided by Financing Activities decreased $57.3$142.4 million for the sixnine months ended JuneSeptember 30, 2021 compared to the sixnine months ended JuneSeptember 30, 2020, primarily as a result of a decrease in financing needs given the lower level of capital spending in our Electric segment in 2021 compared to 2020. Financing activities in the sixnine months ended JuneSeptember 30, 2021 included a net borrowing increase of $47.0$16.9 million under our line of credit facilities and dividend payments of $32.4$48.6 million ($0.781.17 per share).
Financing activities in the sixnine months ended JuneSeptember 30, 2020 included proceeds of $35.0$75.0 million from the issuance of long-term debt, a net borrowing increase of $35.2$42.6 million under our line of credit facilities and $26.9$34.8 million in proceeds raised from the issuance of common stock, net of issuance costs. We paid dividends of $29.9$45.1 million ($0.741.11 per share) in the sixnine months ended JuneSeptember 30, 2020.
CAPITAL REQUIREMENTS
CAPITAL EXPENDITURES
We have a capital expenditure program for expanding, upgrading and improving our plants and operating equipment. Typical uses of cash for capital expenditures are investments in electric generation facilities and environmental upgrades, transmission and distribution lines, manufacturing facilities and upgrades, equipment used in the manufacturing process, and computer hardware and information systems. Our capital expenditure program is subject to review and regulatory approval and is revised in light of changes in demands for energy, technology, environmental laws, regulatory changes, business expansion opportunities, the costs of labor, materials and equipment and our financial condition. Refer
Our 2022 IRP, filed with the MPUC on September 1, 2021, outlined our preferred plan for meeting our electric customers’ anticipated energy needs while maintaining system reliability, which included significant planned additions and enhancements to Item 7, Management's Discussion and Analysisour electric fleet of Financial Condition and Resultsassets. The following provides a summary of Operations, of our Form 10-Kthe actual capital expenditures for the year ended December 31, 2020, and the anticipated capital expenditures for the period 2021 through 2026, for our capital expenditure plan forElectric segment, inclusive of the five year period from 2021 through 2025.additions outlined in our 2022 IRP, and our non-electric businesses:
(in millions)2020
2021(1)
20222023202420252026Total
2022 - 2026
Electric Segment:
Renewables and Natural Gas Generation23 30 80 92 92 160 454 
Technology and Infrastructure26 30 18 — — 74 
Distribution Plant Replacements31 37 35 35 35 33 175 
Transmission (includes replacements)27 26 28 24 20 27 125 
Other34 30 29 32 36 23 150 
Total Electric Segment$357 $117 $149 $202 $201 $183 $243 $978 
Manufacturing and Plastics Segments15 36 33 46 31 21 22 153 
Total Capital Expenditures$372 $153 $182 $248 $232 $204 $265 $1,131 
Total Electric Utility Average Rate Base$1,385 $1,570 $1,630 $1,750 $1,860 $1,980 $2,100 
Annual Rate Base Growth13.4 %3.8 %7.4 %6.3 %6.5 %6.1 %
(1) Includes actual results for the nine months ended September 30, 2021, and anticipated capital expenditures for the fourth quarter of 2021.
CONTRACTUAL OBLIGATIONS
Our contractual obligations primarily include principal and interest payments due under our outstanding debt obligations, commitments to acquire coal, energy and capacity commitments, payments to meet our postretirement benefit obligations, and payment obligations under land easement and leasing arrangements. Our contractual obligations as of December 31, 2020 are included in Item 7, Management's Discussion and Analysis of Financial Condition and Results of Operations, of our Annual Report on Form 10-K for the year ended December 31, 2020. There were no material changes in our contractual obligations outside of the ordinary course of our business during the sixnine months ended JuneSeptember 30, 2021.
COMMON STOCK DIVIDENDS
We paid dividends to our common stockholders totaling $32.4$48.6 million, or $0.78$1.17 per share, in the first sixnine months of 2021. The determination of the amount of future cash dividends to be paid will depend on, among other things, our financial condition, improvement in earnings per share, cash flows from operations, the level of our capital expenditures and our future business prospects. As a result of certain statutory limitations or regulatory or financing agreements, restrictions could occur on the amount of distributions allowed to be made by our subsidiaries. See Note 10 to our consolidated financial statements included in this reportQuarterly Report on Form 10-Q for additional information. The decision to declare a dividend is reviewed quarterly by our Board of Directors.
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CAPITAL RESOURCES
Financial flexibility is provided by operating cash flows, unused lines of credit, and access to capital markets, which is aided by strong financial coverages and investment grade credit ratings. Equity or debt financing will be required in the period 2021 through 2025 to support our capital investments, primarily within our Electric segment to fund construction of new rate base and transmission investments. In addition, we may issue equity or debt financing to opportunistically reduce borrowings under our lines of credit, to satisfy or early retire our outstanding long-term debt, or to finance potential acquisition opportunities or for other corporate purposes.
REGISTRATION STATEMENTS
On May 3, 2021, we filed two registration statements with the SEC. The first statement, a shelf registration, allows us to offer for sale, from time to time, either separately or together in any combination, equity, debt or other securities described in the registration statement. The second registration statement allows for the issuance of up to 1,500,000 common shares under our Automatic Dividend Reinvestment and Share Purchase Plan, which provides our common shareholders, retail customers of OTP and other interested investors a method of purchasing our common shares by reinvesting their dividends and/or making optional cash investments. Shares purchased under the plan may be new issue common shares or common shares purchased on the open market. Both registration statements expire in May 2024.
SHORT-TERM DEBT
Otter Tail Corporation and Otter Tail Power Company are each party to a credit agreement (the OTC Credit Agreement and OTP Credit Agreement, respectively) which each provide for unsecured revolving lines of credit. On September 30, 2021, Otter Tail Corporation entered into a Fourth Amended and Restated Credit Agreement and Otter Tail Power Company entered into a Third Amended and Restated Credit Agreement, amending and restating the previously existing credit agreements to extend the maturity date of each agreement to September 30, 2026. The borrowing capacity and other significant terms of the agreements remained unchanged from the previous credit agreements. The following is a summary of key provisions and borrowing information as of, and for the sixnine months ended, JuneSeptember 30, 2021:
(in thousands, except interest rates)OTC Credit AgreementOTP Credit Agreement
Borrowing Limit$170,000 $170,000 
Borrowing Limit if Accordion Exercised1
290,000 250,000 
Amount Restricted Due to Outstanding Letters of Credit as of June 30, 2021— 12,671 
Amount Outstanding as of June 30, 202159,245 68,712 
Average Amount Outstanding During the Six Months Ended June 30, 202167,335 49,017 
Maximum Amount Outstanding During the Six Months Ended June 30, 202179,718 72,471 
Interest Rate as of June 30, 20211.6 %1.3 %
Maturity DateOctober 31, 2024October 31, 2024
1Each facility includes an accordion featuring allowing the borrower to increase the borrowing limit if certain terms and conditions are met.
Note 6 to our consolidated financial statements included in this report on Form 10-Q includes additional information regarding these instruments.
(in thousands, except interest rates)OTC Credit AgreementOTP Credit Agreement
Borrowing Limit$170,000 $170,000 
Borrowing Limit if Accordion Exercised1
290,000 250,000 
Amount Restricted Due to Outstanding Letters of Credit as of September 30, 2021— 13,159 
Amount Outstanding as of September 30, 202136,624 61,233 
Average Amount Outstanding During the Nine Months Ended September 30, 202158,703 51,911 
Maximum Amount Outstanding During the Nine Months Ended September 30, 202179,718 72,471 
Interest Rate as of September 30, 20211.59 %1.33 %
Maturity DateSeptember 30, 2026September 30, 2026
1Each facility includes an accordion featuring allowing the borrower to increase the borrowing limit if certain terms and conditions are met.
LONG-TERM DEBT
At JuneSeptember 30, 2021, we had $767.0 million of principal outstanding under long-term debt arrangements. These instruments generally provide for unsecured borrowings at fixed rates of interest with maturities ranging from 2021 to 2050.
On June 10, 2021, OTP entered into a Note Purchase Agreement pursuant to which OTP agreed to issue, in a private placement transaction, $230 million aggregate principal amount of OTP’s senior unsecured notes. The funding of the notes will occur in two issuances, $140.0$140 million in November 2021 and $90.0$90 million in May 2022. The issuance of the notes is subject to the satisfaction of certain customary conditions to closing. We intend to use the proceeds of the notes to refinance existing long-term indebtedness, including long-term debt instruments with outstanding principal balances of $140 million and $30.0$30 million, which mature in December 2021 and August 2022, respectively, and for general corporate purposes.
Note 6 to our consolidated financial statements included in this reportQuarterly Report on Form 10-Q includes additional information regarding these short-term and long-term debt instruments.
Financial Covenants
Certain of our short- and long-debt agreements require Otter Tail Corporation and OTP to maintain certain financial covenants. As of JuneSeptember 30, 2021, we were in compliance with these financial covenants as further described below:
Otter Tail Corporation under its financial covenants, may not permit its ratio of Interest-Bearing Debtinterest-bearing debt to Total Capitalizationtotal capitalization to exceed 0.60 to 1.00, may not permit its Interestinterest and Dividend Coverage Ratiodividend coverage ratio to be less than 1.50 to 1.00, and may not permit its Priority Indebtednesspriority indebtedness to exceed 10% of our Total Capitalization.total capitalization. As of JuneSeptember 30, 2021, our Interest-Bearing Debtinterest-bearing debt to Total Capitalizationtotal capitalization was 0.490.47 to 1.00, our Interestinterest and Dividend Coverage Ratiodividend coverage ratio was 5.355.73 to 1.00, and we had no Priority Indebtednesspriority indebtedness outstanding.
OTP under its financial covenants, may not permit its ratio of Debtdebt to Total Capitalizationtotal capitalization to exceed 0.60 to 1.00, may not permit its Interestinterest and Dividend Coverage Ratiodividend coverage ratio to be less than 1.50 to 1.00, and may not permit its Priority Debtpriority debt to exceed 20% of its Total Capitalization.total capitalization. As of JuneSeptember 30, 2021, OTP's Interest-Bearing Debtinterest-bearing debt to Total Capitalizationtotal capitalization was 0.480.47 to 1.00, its Interestinterest and Dividend Coverage Ratiodividend coverage ratio was 3.443.16 to 1.00, and itOTP had no Priority Indebtednesspriority indebtedness outstanding.
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OFF-BALANCE-SHEET ARRANGEMENTS
As of JuneSeptember 30, 2021 we have outstanding letters of credit totaling $16.4$16.9 million, a portion of which reduces our borrowing capacity under our lines of credit. No outstanding letters of credit are reflected in outstanding short-term debt on our consolidated balance sheets. We do not have any other off-balance-sheet arrangements or any relationships with unconsolidated entities or financial partnerships. These entities are often referred to as structured finance special purpose entities or variable interest entities, which are established for the purpose of facilitating off-balance-sheet arrangements or for other contractually narrow or limited purposes. We are not exposed to any financing, liquidity, market or credit risk that could arise if we had such relationships.
CRITICAL ACCOUNTING POLICIES INVOLVING SIGNIFICANT ESTIMATES
The discussion and analysis of our results of operations are based on financial statements prepared in accordance with accounting principles generally accepted in the United States of America. Certain of our accounting policies require management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities in the preparation of our consolidated financial statements. We have disclosed in our Annual Report on Form 10-K for the year ended December 31, 2020 the critical accounting policies that affect our most significant estimates and assumptions used in preparing our consolidated financial statements. There have been no material changes to our critical accounting policies and estimates from those disclosed in the most recent Annual Report on Form 10-K.
ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
There have been no material changes in our market risk from those disclosed in Item 7A, Quantitative and Qualitative Disclosures About Market Risk, in our Annual Report on Form 10-K for the year ended December 31, 2020.
ITEM 4.CONTROLS AND PROCEDURES
Evaluation of Disclosures Controls and Procedures. Under the supervision and with the participation of the Company’s management, including the Chief Executive Officer and the Chief Financial Officer, we evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the Exchange Act)) as of JuneSeptember 30, 2021, the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of JuneSeptember 30, 2021.
Changes in Internal Control over Financial Reporting. There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) under the Exchange Act) during the quarter ended JuneSeptember 30, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION
ITEM 1.LEGAL PROCEEDINGS
We are the subject of various legal and regulatory proceedings in the ordinary course of our business. Such matters are subject to many uncertainties and to outcomes that are not predictable with assurance. We record a liability in our consolidated financial statements for costs related to claims, including future legal costs, settlements and judgments, where we have assessed that a loss is probable, and an amount can be reasonably estimated. Material proceedings are described under Note 9, Commitments and Contingencies, to the consolidated financial statements, and in Management's DiscussionManagement's Discussion and AnalysisAnalysis of Financial Condition and Results of Operations,, Regulatory Rate MattersMatters.
ITEM 1A.RISK FACTORS
There have been no material changes from the risk factors disclosed in Item 1A, Risk Factors, of our Annual Report on Form 10-K for the year ended December 31, 2020.
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ITEM 6.EXHIBITS
The following Exhibits are filed as part of, or incorporated by reference into, this report.
 No.Description
3.110.1
10.2
3.2
4.1
31.1
31.2
32.1
32.2
101.SCH—Inline XBRL Taxonomy Extension Schema Document.Document
101.CAL—Inline XBRL Taxonomy Extension Calculation Linkbase Document.Document
101.LAB—Inline XBRL Taxonomy Extension Label Linkbase Document.Document
101.PRE—Inline XBRL Taxonomy Extension Presentation Linkbase Document.Document
101.DEF—Inline XBRL Taxonomy Extension Definition Linkbase Document.Document
104—Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

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SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
 OTTER TAIL CORPORATION
By:/s/ Kevin G. Moug
  Kevin G. Moug
Chief Financial Officer and Senior Vice President
(duly authorized officer and principal financial officer)
 Dated: August 6,November 3, 2021
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