SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 -------------------------------------------------------- FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCK PURCHASE, SAVINGS AND SIMILAR PLANS PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 -------------------------------------------------------- (Mark one) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [No Fee Required] FOR YEAR ENDED DECEMBER 31, 1998 or [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 [No fee required] For the transition period from to ------- --------- ----------------------------------------------------- COMMISSION FILE NUMBER 0-17605 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office: YANKEE ENERGY SYSTEM, INC. 599 Research Parkway Meriden, CT 06450 YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN FINANCIAL STATEMENTS AND SCHEDULES DECEMBER 31, 1998 AND 1997 INDEX PAGE REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS 1 FINANCIAL STATEMENTS: Statement of Net Assets Available for Benefits as of December 31, 1998 2 Statement of Net Assets Available for Benefits as of December 31, 1997 4 Statement of Changes in Net Assets Available for Benefits for the Year Ended December 31, 1998 5 Statement of Changes in Net Assets Available for Benefits for the Year Ended December 31, 1997 7 NOTES TO FINANCIAL STATEMENTS AND SCHEDULES 8-13 SUPPLEMENTAL SCHEDULES: Schedule I: Item 27a - Schedule of Assets Held for Investment Purposes as of December 31, 1998 14 Schedule II: Item 27d - Schedule of Reportable Transactions for the Year Ended December 31, 1998 15 All schedules, except as set forth above, are omitted as not applicable or not required. REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS To the Plan Administrator of the Yankee Energy System, Inc. 401(k) Employee Stock Ownership Plan: We have audited the accompanying statements of net assets available for benefits of Yankee Energy System, Inc. 401(k) Employee Stock Ownership Plan (the Plan) as of December 31, 1998 and 1997, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements and schedules referred to below are the responsibility of the Plan administrator. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits in accordance with generally accepted auditing standards. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 1998 and 1997, and the changes in net assets available for benefits for the years then ended in conformity with generally accepted accounting principles. Our audits were made for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of reportable transactions and assets held for investment purposes are presented for purposes of additional analysis and are not a required part of the basic financial statements but are supplementary information required by the Department of Labor Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. The supplemental schedules have been subjected to the auditing procedures applied in the audit of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole. Arthur Andersen LLP Hartford, Connecticut June 15, 1999 YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS AS OF DECEMBER 31, 1998 MERRILL LYNCH GROWTH FUND MERRILL LYNCH INVESTMENT RETIREMENT AND NORTHEAST MERRILL LYNCH CASH PRESERVATION RETIREMENT UTILITIES BASIC VALUE FUND TRUST CLASS A STOCK FUND FUND CLASS A --------- ---------- ------------ ---------- ------------- ASSETS: Short term investments $ - $8,563,481 $ - $ - $ - Mutual funds - - 5,300,316 - 5,543,301 Common stock - - - 1,242,714 - Employer contributions receivable - 6,400 3,564 - 2,722 Employee contributions receivable - 50,131 42,889 - 35,004 Accrued interest receivable 10,043 - - - - --------- ---------- ---------- ---------- ---------- Total assets 10,043 8,620,012 5,346,769 1,242,714 5,581,027 --------- ---------- ---------- ---------- ---------- LIABILITIES: Overdraft 240,257 - - - - Note payable - current - - - - - --------- ---------- ---------- ---------- ---------- NET ASSETS AVAILABLE FOR BENEFITS $(230,214) $8,620,012 $5,346,769 $1,242,714 $5,581,027 --------- ---------- ---------- ---------- ---------- --------- ---------- ---------- ---------- ---------- MERRILL LYNCH MERRILL LYNCH GLOBAL YES, INC. CAPITAL FUN YES, INC. ALLOCATION ALLOCATION CLASS A LOAN FUND FUND CLASS A FUND ---------- ---------- ------------- ---------- ASSETS: Short term investments $ - $1,050,604 $ - $ - Mutual funds 2,610,466 - 626,544 - Common stock - - - 4,476,024 Employer contributions receivable 1,957 - 582 775,986 Employee contributions receivable 18,725 - 5,912 - Accrued interest receivable - - - - ---------- ---------- -------- ---------- Total assets 2,631,148 1,050,604 633,038 5,252,010 ---------- ---------- -------- ---------- LIABILITIES: Overdraft - - - - Note payable - current - - - - ---------- ---------- -------- ---------- NET ASSETS AVAILABLE FOR BENEFITS $2,631,148 $1,050,604 $633,038 $5,252,010 ========== ========== ======== ========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS AS OF DECEMBER 31, 1998 YES, INC. MFS ALLIANCE VOLUNTARY STRATEGIC PREMIER LORD ABBETT STOCK INCOME GROWTH DEVELOPING FUND FUND FUND GROWTH FUND --------- --------- -------- ----------- ASSETS: Short term investments $ - $ - $ - $ - Mutual funds - 189,693 1,107,981 470,064 Common stock 1,920,345 - - - Employer contributions receivable 1,494 156 593 219 Employee contributions receivable 10,580 3,767 13,355 5,945 Accrued interest receivable - - - - ---------- -------- ---------- -------- Total assets 1,932,419 193,616 1,121,929 476,228 ---------- -------- ---------- -------- LIABILITIES: Overdraft - - - - Note payable - current - - - - ---------- -------- ---------- -------- NET ASSETS AVAILABLE FOR BENEFITS $1,932,419 $193,616 $1,121,929 $476,228 ========== ======== ========== ======== MERRILL AIM LYNCH INTERNATIONAL S&P 500 LOAN 1998 EQUITY FUND INDEX FUND SUSPENSE TOTAL ------------- ----------- --------- ----- ASSETS: Short term investments $ - $ - $ - $ 9,614,085 Mutual funds 198,860 794,594 - 16,841,819 Common stock - - 1,828,736 9,467,819 Employer contributions receivable 95 413 - 794,181 Employee contributions receivable 3,544 8,314 - 198,166 Accrued interest receivable - - - 10,043 -------- -------- ---------- ----------- Total assets 202,499 803,321 1,828,736 36,926,113 -------- -------- ---------- ----------- LIABILITIES: Overdraft - - - 240,257 Note payable - current - - 200,000 200,000 -------- -------- ---------- ----------- NET ASSETS AVAILABLE FOR BENEFITS $202,499 $803,321 $1,628,736 $36,485,856 ======== ======== ========== =========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS AS OF DECEMBER 31, 1997 MERRILL LYNCH GROWTH FUND MERRILL LYNCH INVESTMENT RETIREMENT AND NORTHEAST MERRILL LYNCH MERRILL LYNCH CASH PRESERVATION RETIREMENT UTILITIES BASIC VALUE CAPITAL FUND FUND TRUST CLASS A STOCK FUND FUND CLASS A CLASS A ---- ------------ ------------- ---------- ------------- ------------- ASSETS: Cash $90,629 $ - $ - $ - $ - $ - Short term investments - 7,910,067 - - - - Mutual funds - - 6,984,408 - 4,394,646 2,213,837 Common stock - - - 1,047,860 - - Employer contributions receivable - 7,212 4,202 - 2,506 2,076 Employee contributions receivable - 44,590 53,412 - 30,682 18,051 Accrued interest receivable 8,950 - - - - - ------- ---------- ---------- ---------- ---------- ---------- Total assets 99,579 7,961,869 7,042,022 1,047,860 4,427,834 2,233,964 ------- ---------- ---------- ---------- ---------- ---------- LIABILITIES: Note payable - long term - - - - - - Note payable - current - - - - - - ------- ---------- ---------- ---------- ---------- ---------- Total liabilities - - - - - - ------- ---------- ---------- ---------- ---------- ---------- NET ASSETS AVAILABLE FOR BENEFITS $99,579 $7,961,869 $7,042,022 $1,047,860 $4,427,834 $2,233,964 ======= ========== ========== ========== ========== ========== MERRILL LYNCH YES, INC. GLOBAL YES, INC. VOLUNTARY YES, INC. ALLOCATION FUND ALLOCATION STOCK LOAN 1997 LOAN FUND CLASS A FUND FUND SUSPENSE TOTAL --------- --------------- ---------- ---------- -------- ------ ASSETS: Cash $ - $ - $ - $ - $ - $ 90,629 Short term investments 951,067 - - - - 8,861,134 Mutual funds - 712,512 - - - 14,305,403 Common stock - - 3,980,953 1,936,395 2,224,355 9,189,563 Employer contributions receivable - 670 531,686 1,869 - 550,221 Employee contributions receivable - 7,096 - 11,622 - 165,453 Accrued interest receivable - - - - - 8,950 -------- -------- ---------- ---------- ---------- ----------- Total assets 951,067 720,278 4,512,639 1,949,886 2,224,355 33,171,353 -------- -------- ---------- ---------- ---------- ----------- LIABILITIES: Note payable - long term - - - - 200,000 200,000 Note payable - current - - - - 400,000 400,000 -------- -------- ---------- ---------- ---------- ----------- Total liabilities - - - - 600,000 600,000 -------- -------- ---------- ---------- ---------- ----------- NET ASSETS AVAILABLE FOR BENEFITS $951,067 $720,278 $4,512,639 $1,949,886 $1,624,355 $32,571,353 ======== ======== ========== ========== ========== =========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS FOR THE YEAR ENDED DECEMBER 31, 1998 PARTICIPANT DIRECTED ----------------------------------------------------------------------------- MERRILL MERRILL LYNCH LYNCH MERRILL MERRILL LYNCH GROWTH FUND NORTHEAST BASIC LYNCH RETIREMENT INVESTMENT AND UTILITIES VALUE CAPITAL CASH PRESERVATION RETIREMENT STOCK FUND FUND FUND TRUST CLASS A FUND CLASS A CLASS A ---- ------------- --------------- --------- --------- ------- ADDITIONS: Employee contributions and rollovers $ 274 $1,327,051 $ 1,433,080 $ - $ 937,339 $ 507,752 Employer contributions - 67,841 40,410 - 27,897 20,909 Interfund transfers in 1,463,108 692,961 - 926,078 259,499 Earnings - Interest/other income 194,120 26,827 24,527 - 12,208 8,210 Dividends - 525,128 113,723 27,033 453,496 168,267 Realized gain (loss) - - (36,619) (71,131) 190,936 28,215 Unrealized gain (loss) - - (1,815,510) 451,777 (71,460) (56,849) --------- ---------- ----------- ---------- ---------- ---------- Total additions 194,394 3,409,955 452,572 407,679 2,476,494 936,003 --------- ---------- ----------- ---------- ---------- ---------- DEDUCTIONS: Interfund transfers out - 1,653,563 1,596,628 63,942 1,096,501 421,154 Benefit distributions 524,187 1,098,249 551,197 148,883 226,800 117,665 --------- ---------- ----------- ---------- ---------- ---------- Total deductions 524,187 2,751,812 2,147,825 212,825 1,323,301 538,819 --------- ---------- ----------- ---------- ---------- ---------- Net increase (decrease) (329,793) 658,143 (1,695,253) 194,854 1,153,193 397,184 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 99,579 7,961,869 7,042,022 1,047,860 4,427,834 2,233,964 --------- ---------- ----------- ---------- ---------- ---------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $(230,214) $8,620,012 $ 5,346,769 $1,242,714 $5,581,027 $2,631,148 ========= ========== =========== ========== ========== ========== PARTICIPANT DIRECTED ----------- MERRILL LYNCH YES, INC. GLOBAL YES, INC. LOAN ALLOCATION ALLOCATION FUND FUND CLASS A FUND --------- -------------- ------------ ADDITIONS: Employee contributions and rollovers $ (428,937) $194,358 $ - Employer contributions - 6,437 791,478 Interfund transfers in - 70,676 - Earnings - Interest/other income 116,725 1,984 - Dividends - 75,894 - Realized gain (loss) - (9,814) 38,096 Unrealized gain (loss) - (59,219) 318,167 ---------- -------- ---------- Total additions (312,212) 280,316 1,147,741 ---------- -------- ---------- DEDUCTIONS: Interfund transfers out - 289,244 1,508 Benefit distributions (411,749) 78,312 406,862 ---------- -------- ---------- Total deductions (411,749) 367,556 408,370 ---------- -------- ---------- Net increase (decrease) 99,537 (87,240) 739,371 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 951,067 720,278 4,512,639 ---------- -------- ---------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $1,050,604 $633,038 $5,252,010 ========== ======== ========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS FOR THE YEAR ENDED DECEMBER 31, 1998 PARTICIPANT DIRECTED ------------------------------------------------------------------------------------------------- MERRILL YES, INC. ALLIANCE LORD AIM LYNCH VOLUNTARY MFS PREMIER ABBETT INTERNATIONAL S&P 500 STOCK STRATEGIC GROWTH DEVELOPING EQUITY INDEX FUND INCOME FUND FUND GROWTH FUND FUND FUND --------- ----------- ---------- ----------- ------------- -------- ADDITIONS: Employee contributions and rollovers $ 218,102 $ 33,376 $ 234,051 $151,014 $ 36,978 $ 72,223 Employer contributions 17,986 778 2,901 1,168 453 1,351 Interfund transfers in 94,791 202,930 930,401 446,402 211,854 789,154 Earnings - Interest/other income 11,217 230 461 577 445 174 Dividends 95,681 7,208 21,238 - 3,209 31,357 Realized gain (loss) 71,850 (1,110) (15,763) (16,904) (308) (2,333) Unrealized gain (loss) 97,237 (9,039) 116,049 39,646 (6,318) 20,009 ---------- -------- ---------- -------- -------- -------- Total additions 606,864 234,373 1,289,338 621,903 246,313 911,935 ---------- -------- ---------- -------- -------- -------- DEDUCTIONS: Interfund transfers out 460,334 40,741 166,251 145,625 43,774 108,589 Benefit distributions 163,997 16 1,158 50 40 25 ---------- -------- ---------- -------- -------- -------- Total deductions 624,331 40,757 167,409 145,675 43,814 108,614 ---------- -------- ---------- -------- -------- -------- Net increase (decrease) (17,467) 193,616 1,121,929 476,228 202,499 803,321 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 1,949,886 - - - - - ---------- -------- ---------- -------- -------- -------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $1,932,419 $193,616 $1,121,929 $476,228 $202,499 $803,321 ========== ======== ========== ======== ======== ======== LOAN 1998 SUSPENSE TOTAL -------- ----- ADDITIONS: Employee contributions and rollovers $ - $ 4,716,661 Employer contributions (147,178) 832,431 Interfund transfers in - 6,087,854 Earnings - Interest/other income - 397,705 Dividends - 1,522,234 Realized gain (loss) - 175,115 Unrealized gain (loss) 151,559 (823,951) ---------- ----------- Total additions 4,381 12,908,049 ---------- ----------- DEDUCTIONS: Interfund transfers out - 6,087,854 Benefit distributions - 2,905,692 ---------- ----------- Total deductions - 8,993,546 ---------- ----------- Net increase (decrease) 4,381 3,914,503 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 1,624,355 32,571,353 ---------- ----------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $1,628,736 $36,485,856 ========== =========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS FOR THE YEAR ENDED DECEMBER 31, 1997 PARTICIPANT DIRECTED -------------------------------------------------------------------------------- MERRILL MERRILL LYNCH LYNCH MERRILL MERRILL LYNCH GROWTH FUND NORTHEAST BASIC LYNCH RETIREMENT INVESTMENT AND UTILITIES VALUE CAPITAL CASH PRESERVATION RETIREMENT STOCK FUND FUND FUND TRUST CLASS A FUND CLASS A CLASS A ---- ------------- -------------- ---------- --------- -------- ADDITIONS: Employee contributions and rollovers $ - $ 594,352 $ 719,880 $ - $ 436,681 $ 242,693 Employer contributions - 80,099 40,609 - 23,753 20,299 Interfund transfers in - 724,513 497,689 - 503,271 131,415 Earnings - Interest/other income 2,246 22,946 16,042 - 9,916 7,872 Dividends - 498,892 551,523 24,170 327,192 180,196 Realized gain (loss) - - 134,653 (176,425) 58,317 10,272 Unrealized gain (loss) - - 356,739 45,303 520,943 175,699 -------- ---------- ---------- ---------- ---------- ---------- Total additions 2,246 1,920,802 2,317,135 (106,952) 1,880,073 768,446 -------- ---------- ---------- ---------- ---------- ---------- DEDUCTIONS: Interfund transfers out - 911,685 313,144 116,122 149,348 93,268 Benefit distributions (87,986) 595,566 449,074 75,491 206,417 73,226 -------- ---------- ---------- ---------- ---------- ---------- Total deductions (87,986) 1,507,251 762,218 191,613 355,765 166,494 -------- ---------- ---------- ---------- ---------- ---------- Net increase (decrease) 90,232 413,551 1,554,917 (298,565) 1,524,308 601,952 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 9,347 7,548,318 5,487,105 1,346,425 2,903,526 1,632,012 -------- ---------- ---------- ---------- ---------- ---------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $ 99,579 $7,961,869 $7,042,022 $1,047,860 $4,427,834 $2,233,964 ======== ========== ========== ========== ========== ========== PARTICIPANT PARTICIPANT DIRECTED DIRECTED ----------- ----------- MERRILL LYNCH YES, INC. YES, INC. GLOBAL YES, INC. VOLUNTARY LOAN ALLOCATION ALLOCATION STOCK LOAN 1997 FUND FUND CLASS A FUND FUND SUSPENSE TOTAL --------- ------------ ---------- --------- -------- ----- ADDITIONS: Employee contributions and rollovers $(322,609) $138,761 $ - $ 175,453 $ - $ 1,985,211 Employer contributions - 7,004 531,686 20,572 (53,533) 670,489 Interfund transfers in - 165,405 - 40,137 - 2,062,430 Earnings - Interest/other income - 1,787 - 57,613 - 118,422 Dividends - 89,538 - 100,870 - 1,772,381 Realized gain (loss) - 2,748 8,310 18,975 - 56,850 Unrealized gain (loss) - (36,449) 805,365 381,526 442,737 2,691,863 --------- -------- ---------- ---------- ---------- ----------- Total additions (322,609) 368,794 1,345,361 795,146 389,204 9,357,646 --------- -------- ---------- ---------- ---------- ----------- DEDUCTIONS: Interfund transfers out - 21,422 13,554 443,887 - 2,062,430 Benefit distributions (632,142) 16,981 277,605 166,734 - 1,140,966 --------- -------- ---------- ---------- ---------- ----------- Total deductions (632,142) 38,403 291,159 610,621 - 3,203,396 --------- -------- ---------- ---------- ---------- ----------- Net increase (decrease) 309,533 330,391 1,054,202 184,525 389,204 6,154,250 NET ASSETS AVAILABLE FOR BENEFITS, beginning of year 641,534 389,887 3,458,437 1,765,361 1,235,151 26,417,103 --------- -------- ---------- ---------- ---------- ----------- NET ASSETS AVAILABLE FOR BENEFITS, end of year $ 951,067 $720,278 $4,512,639 $1,949,886 $1,624,355 $32,571,353 ========= ======== ========== ========== ========== =========== The accompanying notes are an integral part of these financial statements. YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN NOTES TO FINANCIAL STATEMENTS AND SCHEDULES DECEMBER 31, 1998 AND 1997 1. ESTABLISHMENT OF THE PLAN: The Yankee Energy System, Inc. 401(k) Employee Stock Ownership Plan (the Plan) was established and effective on July 1, 1989 (the effective date) following the divestiture of the gas business of the Connecticut Light and Power Company (CL&P), a wholly-owned subsidiary of Northeast Utilities (NU), and the related creation of Yankee Energy System, Inc. (YES). Each transferred gas employee participating in the Northeast Utilities Tax Reduction Act Employee Stock Ownership Plan (TRAESOP), Payroll Based Employee Stock Ownership Plan (PAYSOP) or Supplemental Retirement Savings Plan became a participant in the Plan effective July 1, 1989. Participant account balances and $7,203,056 in assets were transferred to the Plan on the effective date. The assets were comprised of NU common stock and cash. 2. PLAN DESCRIPTION: The following description of the Plan provides only general information. Participants should refer to the Plan agreement for a more complete description of the Plan's provisions. GENERAL - The Plan is a defined contribution 401(k) Employee Stock Ownership Plan established to provide benefits to eligible employees. Participation in the Plan is voluntary. Union employees become eligible to participate on the first day of the month following the completion of one year of service. Non-union employees become eligible to participate on the first day of the month following the completion of six months of service. CONTRIBUTIONS - Participants contribute between 1% and 15% of compensation subject to limitations set forth by the Plan. Investment of employee contributions in the various funds is at the employees' discretion. YES matches 100% of non-union employee pre-tax contributions annually up to 3% of compensation and 50% of union employee pre-tax contributions each month up to 5% of compensation. Effective January 1, 1998, YES began matching 100% of non-union Yankee Energy Services Company employee pre-tax contributions annually up to 5% of compensation. BENEFIT PAYMENTS - Unless a participant elects otherwise, benefit distributions are made in a lump sum not later than sixty days following the end of the Plan year following the later of the participant's 65th birthday, the 10th anniversary of the date on which participation commenced or the termination of employment. In the event of the death of a participant prior to distribution, benefits will be paid to a designated beneficiary in a lump sum. VESTING - Non-union employees become 100% vested upon commencing participation in the Plan. Union employees shall at all times be fully vested in employee contributions and will vest in the employer contributions in accordance with the following schedule: YEARS OF SERVICE VESTING % 1 20% 2 40% 3 60% 4 80% 5 or more 100% The account balances of union employees, as of June 3, 1989, formerly participating in the NU Supplemental Retirement Savings Plan and NU TRAESOP and PAYSOP became fully vested on July 1, 1989. Notwithstanding the foregoing, union participants shall be fully vested in employer contributions upon reaching age 65 or in the event of death or total disability. Any union employee forfeitures will be used to reduce future employer contributions. LOANS - Participants may borrow up to the lesser of 50% of the participant's vested interest in his total account or $50,000, reduced by the highest outstanding balance of loans from the Plan during the one-year period preceding the date of the loan. INVESTMENT OPTIONS - The Plan consists of fifteen funds as follows: Cash Fund - Represents a cash fund which is used as a temporary account for overnight transactions and features an investment sweep option to earn interest daily. Merrill Lynch Retirement Preservation Trust - Provides preservation of participants' investments, liquidity and current income that is typically higher than money market funds. Merrill Lynch Growth Fund Investment and Retirement Class A - Invests in securities, primarily equities. Northeast Utilities Stock Fund - Account maintains Northeast Utilities stock belonging to transferred CL&P and Northeast Utilities Service Company (NUSCO) employees formerly participating in the NU Supplemental Retirement Savings Plan. Merrill Lynch Basic Value Fund Class A - Invests in securities, primarily equities. Merrill Lynch Capital Fund Class A - Invests in equity securities, corporate bonds and money market securities. YES, Inc. Loan Fund - Represents a clearing account for participant loans. Merrill Lynch Global Allocation Fund Class A - Invests in U.S. and foreign equity, debt and money market securities. YES, Inc. Allocation Fund - Represents the employer matching fund, which invests in Yankee Energy System, Inc. common stock. YES, Inc. Voluntary Stock Fund - Invests in Yankee Energy System, Inc. common stock. MFS Strategic Income Fund - Invests in foreign and domestic fixed-income securities. Alliance Premier Growth Fund - Invests in a limited number of primarily large U.S. company common stocks and other equity securities. Lord Abbett Developing Growth Fund - Invests in small company stocks. AIM International Equity Fund - Invests in primarily foreign equity securities. Merrill Lynch S&P 500 Index Fund - Invests in securities listed on Standard & Poor's 500 Index. 3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: BASIS OF ACCOUNTING - The accompanying financial statements and schedules of the Plan have been prepared on the accrual basis of accounting. USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS - The preparation of financial statements in conformity with generally accepted accounting principles and the Department of Labor Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974 requires management of the plan to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates. RECLASSIFICATIONS - Certain prior year amounts have been reclassified to conform with current year classifications. ADMINISTRATIVE EXPENSES - Administrative expenses of the Plan are paid from the Plan assets unless paid by YES. Administrative expenses of approximately $70,500 and $59,000 were paid by YES in 1998 and 1997, respectively. VALUATION OF INVESTMENTS - The Plan's investments are stated at fair value. Securities traded on the national securities exchange are valued at the last reported sales price on the last business day of the plan year. Investments traded in the over-the-counter market and listed securities for which no sale was reported on that date are valued at the last reported bid price. 4. INVESTMENTS: The fair market value of individual investments that represent 5% or more of the Plan's total net assets as of December 31, 1998 and 1997 are as follows: 1998 1997 ---- ---- Yankee Energy System, Inc. common stock $8,225,105 $8,141,703 Merrill Lynch Growth Fund Investment and Retirement Class A 5,300,316 6,984,408 Merrill Lynch Retirement Preservation Trust Money Market 8,563,481 7,910,067 Merrill Lynch Basic Value Fund Class A 5,543,301 4,394,646 Merrill Lynch Capital Fund Class A 2,610,466 2,213,837 During 1998, the Plan's investments depreciated in fair value by $(648,836) as follows: NET (DEPRECIATION) APPRECIATION IN FAIR VALUE DURING YEAR ----------------- Fair value as determined by quoted market value: Mutual funds $(1,706,391) YES common stock 676,909 NU common stock 380,646 ----------- $ (648,836) ----------- ----------- During 1997, the Plan's investments appreciated in fair value by $2,748,713 as follows: NET APPRECIATION (DEPRECIATION) IN FAIR VALUE DURING YEAR ----------------- Fair value as determined by quoted market value: Mutual funds $ 1,222,922 YES common stock 1,656,913 NU common stock (131,122) ----------- $ 2,748,713 ----------- ----------- 5. NOTE PAYABLE: The Plan has secured a $4,000,000 loan from a commercial bank to Fleet Bank, N.A., the former trustee, the proceeds of which were used to buy YES common stock for the Plan. YES has guaranteed the loan. The loan will be repaid over a ten year period ending July 1, 1999 at $400,000 per year plus interest at a rate of 10.38%. Employer non-union matching contributions are used to make annual principal payments. Interest is paid from the earnings of the YES, Inc. allocation fund. As the loan is paid down, an equivalent amount of YES stock, which serves as collateral, is released and allocated to participants. 6. TAX STATUS: The Plan obtained its latest determination letter on March 20, 1996 in which the Internal Revenue Service stated that the form of the Plan, as then designed, was in compliance with the applicable requirements of the Internal Revenue Code. The Plan has been amended since the determination letter was received. However, the Plan administrator believes that the Plan is currently designed and being operated in compliance with the applicable requirements of the Internal Revenue Code. Therefore, the Plan administrator believes that the Plan is qualified. 7. VOTING RIGHTS: Each participant is entitled to exercise voting rights attributable to the shares allocated to his account and is notified by Merrill Lynch Trust Company (the Trustee) prior to the time that such rights are to be exercised. The Trustee is not permitted to vote any share for which instructions have not been given by a participant. The Trustee is required, however, to vote any unallocated shares on behalf of the collective best interest of plan participants and beneficiaries. 8. TERMINATION OF THE PLAN: YES may suspend, terminate, or completely discontinue contributions under the Plan with respect to its employees subject to the provisions of the Employee Retirement Income Security Act of 1974 relating to plan terminations. Upon termination or partial termination of the Plan, the rights of all affected participants to their accounts to the date of such termination shall be fully vested to the extent funded. 9. SUBSEQUENT EVENT: On June 15, 1999, YES announced that it entered into an agreement to be acquired by NU. The effect of the acquisition on the Plan has not yet been determined. SCHEDULE I EIN# 06-1236430 PLAN# 001 YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN ITEM 27a - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AS OF DECEMBER 31, 1998 (c) Description of investment, including maturity date, rate of (b) Identity of issue, borrower, interest, collateral, (e) Current (a) lessor or similar party par or maturity value (d) Cost value - --- -------------------------------- ---------------------- -------- ----------- Common Stock: ------------- * Yankee Energy System, Inc. 282,406 shares $ 6,191,382 $ 8,225,105 * Northeast Utilities 77,669 shares 1,663,548 1,242,714 ----------- ----------- Total common stock 7,854,930 9,467,819 ----------- ----------- Mutual Funds: ------------- * Merrill Lynch Growth Fund Investment and Retirement Class A 246,412 shares 6,107,616 5,300,316 * Merrill Lynch Basic Value Fund Class A 145,799 shares 4,816,572 5,543,301 * Merrill Lynch Capital Fund Class A 75,863 shares 2,453,768 2,610,466 * Merrill Lynch Global Allocation Fund Class A 49,686 shares 720,054 626,544 * Merrill Lynch S&P 500 Index Fund 51,934 shares 774,585 794,594 Lord Abbett Developing Growth Fund 30,406 shares 430,419 470,064 AIM International Equity Fund 8,952 shares 205,178 198,860 Alliance Premier Growth Fund 36,615 shares 991,932 1,107,981 MFS Strategic Income Fund 25,600 shares 198,732 189,693 ----------- ----------- Total mutual funds 16,698,856 16,841,819 ----------- ----------- Short-Term Investments: ----------------------- * Merrill Lynch Retirement Preservation Trust 8,563,481 shares 8,563,481 8,563,481 * YES, Inc. Loan Fund 1,050,604 shares 1,050,604 1,050,604 ----------- ----------- Total short-term investments 9,614,085 9,614,085 ----------- ----------- Total investments $34,167,871 $35,923,723 =========== =========== *Indicates a party in interest. The accompanying notes are an integral part of this schedule. SCHEDULE II EIN# 06-1236430 PLAN# 001 YANKEE ENERGY SYSTEM, INC. 401(k) EMPLOYEE STOCK OWNERSHIP PLAN ITEM 27d - SCHEDULE OF REPORTABLE TRANSACTIONS FOR THE YEAR ENDED DECEMBER 31, 1998 (a) Identity of (b) Description (c) Purchase (d) Selling (e) Lease (f) Expense incurred party involved of asset Price price rental with transaction - --------------- --------------- --------------- ------------- ----------- --------------------- Merrill Lynch Retirement Preservation Trust $2,285,640 $ - $ - $ - Merrill Lynch Retirement Preservation Trust - 1,886,195 - - (h) Current value (g) Cost of of asset on (i) Net gain asset transaction date or (loss) - ----------- ------------------- ------------- $2,285,640 $2,285,640 $ - 1,886,195 1,886,195 - The accompanying notes are an integral part of this schedule. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. YANKEE ENERGY SYSTEM, INC. 401 (K) EMPLOYEE STOCK OWNERSHIP PLAN ------------------------------------- (Name of the Plan) Date June 29, 1999 By /s/ James M. Sepanski ----------------------------- James M. Sepanski Vice President, Chief Financial Officer and Treasurer Date June 29, 1999 By /s/ Robin H. Planco ------------------------------ Robin H. Planco Administrator of the Plan Director of Human Resources Date June 29, 1999 By /s/ Mary J. Healey ------------------------------- Mary J. Healey Vice President, General Counsel and Secretary CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS ----------------------------------------- As independent public accountants, we hereby consent to the incorporation of our report dated June 15, 1999 included in this Form 11-K into Yankee Energy System, Inc. 401 (k) Employee Stock Ownership Plan's previously filed Registration Statement File No. 33-52077. /s/ Arthur Andersen LLP Hartford, Connecticut June 25, 1999