UIL (UIL) 8-K 47th Annual EEI Financial Conference

Exhibit 99.1

47th Annual EEI Financial
Conference

November 2012

Exhibit 99.1

Note to Investors

James Torgerson

President and Chief Executive Officer

Richard Nicholas

Executive Vice President and Chief Financial Officer

For more information, contact:

Susan Allen - V.P. IR, 203.499.2409, Susan.Allen@uinet.com

Michelle Hanson - Mgr. IR, 203.499.2481, Michelle.Hanson@uinet.com

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Today’s Topics

qOverview

§Corporate Structure

§Investment Highlights

§Hurricane Sandy Update

§CT Comprehensive Energy Strategy

qUpdated Forecasts

§CapEx

§Average Rate Base

qBusiness Operations

§Gas Distribution

§Electric Transmission

§Electric Distribution

qFinancials

qCT & MA State Regulatory

qConclusion

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Who We Are……

qService territory: 335 sq
miles

q~320,000 customers

qAllowed Distribution ROE
of 8.75%

qEarned ‘11 Transmission
ROE (composite) of 12.4%

q50% interest in GenConn
Energy LLC

The United Illuminating
Company (UI)

UIL Holdings
Corporation

Service Area Key

SCG

CNG

UI

Berkshire

Overlapping Territory

qService territory: 716 sq
miles - Greater Hartford-
New Britain & Greenwich

q~160,000 customers

q2,022 miles of mains with
~126,000 services

qAllowed ROE of 9.41%
going forward

Connecticut Natural Gas
(CNG)

qService territory: 738 sq
miles in Western MA
including Pittsfield and
North Adams

q~36,000 customers

q744 miles of mains with
~31,000 services

qAllowed ROE of 10.50%

Berkshire Gas Company
(Berkshire)

qService territory: 512 sq
miles from Westport, CT
to Old Saybrook, CT

q~178,000 customers

q2,281 miles of mains with
~133,000 services

qAllowed ROE of 9.36%
going forward

Southern Connecticut Gas
(SCG)

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Why UIL……..

Pure-play
electric&gas
utilities

§Virtually 100% regulated

§Electric distribution & transmission and gas distribution utilities -
complementary earnings patterns

§Earnings growth opportunities at both electric and gas operations

Financial
strategy

§Commitment to investment grade credit profile

§Consistent history of dividend payments

§Objective is to achieve allowed ROEs

§Focused on controlling costs

High probability
growth

§$3.5 billion 10-year capital expenditure program

§Natural gas expansion through customer conversions

§Growth opportunities in electric transmission and distribution

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Recent Storm Update

Hurricane Sandy

q Approximately 280,000 customer outages

§Within 7 days of the storm ending, 99% of customers
had power restored

q Preliminary cost estimate of approximately $35-
        $40M

§Approximately 40% capital & 60% O&M

úA regulatory asset has been established and expect
to seek recovery of these costs in a future rate
proceeding

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Hurricane Sandy

Impact across UI service territory

Fairfield

qGovernor Malloy and the Department of Energy & Environmental Protection (DEEP)
issued a Draft of Connecticut’s CES on October 5th

§Document provides a foundation for informed policy, regulatory, and legislative decisions

qCovers all fuels in all sectors with a planning horizon out to the year 2050

qFive major priority areas are:

§Energy efficiency

§Electricity supply, including renewable power (may increase renewable standards)

§Industrial energy needs

§Transportation

§Natural Gas

qThe draft includes the goal of making natural gas, a lower-cost option, available to more than
250,000 additional residential customers and potentially up to 75% of businesses in Connecticut
in the next seven years

qDraft also provides for effective financing tools for customers

qTimeline:

§Public hearings November 9-20

§Technical meetings November 14-28

§Written comments due on or before December 14th

§Final decision expected in early 2013

Comprehensive Energy Strategy (CES)

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10-yr Capex Forecast Update (2013-2022)

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•Does not include potential to construct, own and operate up to 10MW of Class I renewable generation

•Does not include GenConn

Amounts may not add due to rounding

Identified projects with clear need & high probability

q Previous Forecast (‘12-’21) - $2.9B

q Gas, New Business ~ 120% increase, $308M to $680M

q System Hardening ~ $184M

Rate Base Forecast (2012-2017)
excluding GenConn Equity

$M

2012-2017

CAGR 8.0%

Gas

Distribution:

5.2%

Electric

Transmission:

7.9%

Electric

Distribution:

12.9%

Gas forecast includes 338 (H)(10) election

Amounts may not add due to rounding

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Gas Distribution

Gas Distribution Capex 2013-2022

qPrevious ‘12-’21 forecast
$961M

qAddresses replacement of
cast iron & bare steel

qSignificant increase in New
Business

Amounts may not add due to rounding

Gas Conversions

qConverted 9,233customers YTD Oct. ’12, compared to 5,740 YTD Oct. ‘11 - a 61% increase over
the same period in ‘11

q2011-2013 target is to convert 30,000-35,000 customers to gas heat

§2013 goal is to convert approximately 12,200 customers

§2012 goal is to convert approximately 10,200 customers

§Converted approximately 8,300 customers in 2011

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Gas Conversions Forecast

qPotential customers

§The New England & CT regions have historically relied heavily on heating oil

§66% customer penetration on gas mains

§Approximate number of non customers on gas mains ~154,900*

úLow use customers on existing mains ~38,000

qOn target to reach goal of converting 30,000-35,000 customers from 2011-2013

qCES could enable conversion of approximately 55,000 customers from 2014-
2016

§2014 goal is to convert approximately 25% more customers than 2013 level

§CES draft provides support for:

úStatewide policy support to achieve 50% market penetration

úEffective financing tools for consumers

úLarge system expansion projects are enabled

qEach new residential customer is anticipated to generate approximately $280-
$315 of distribution net income annually

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* Not including low use customers

Electric Transmission

Electric Transmission Capex 2013-2022

qPrevious ‘12-’21 forecast
$571M

qCapEx spend for storm
preparedness - system
hardening

Amounts may not add due to rounding

Examples of Electric Transmission Projects

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Shelton 115/13.8 kV
Substation

§Meets Greater
Shelton area load
growth

§In planning

§Planned in-service
2014

~ $40M*

East Shore 115 kV
Substation Upgrades

§Addresses condition
of infrastructure, short
circuit capability and
maintenance

§Phased upgrades in
engineering and in-
service

§Planned in-service
2013

~ $25M*

Milford and Bridgeport
115kV Railroad Upgrades

*Dollars shown are rounded/approximate expected total project CapEx (generally including both spend to date and future expected spend); excluding AFUDC.

** Based on most recent information/estimate from NU

§Increases the capacity
of the transmission
lines

§Includes installing
new transmission
structures and line
reconductoring

§Planned in-service
2013-2016

~ $53M

New England East-West
Solution (NEEWS)

§UI participation in
CL&P Project

§UI’s portion, greater of
$60M**or 8.4% of costs
for the CT portions

§Planned in-service
2012-2016

~ $50M

FERC-Related Development

Challenge to Regional Transmission Base ROE:

q“206” complaint filed at FERC by multiple state governmental entities in September 2011

§Claiming that current approved base ROE on transmission investment of 11.14% is not just and reasonable

qFERC has set the matter for hearing

§The complainants’ direct case was filed on October 1, 2012 , recommending an ROE of 9.0%

§Respondents’ answer to the direct case is scheduled to be filed on November 20, 2012

§Hearing scheduled for May 2013, with an initial decision from the hearing judge scheduled for September
2013

§In the event there is a reduction to the ROE, the order established a refund effective date of October 1, 2011

§FERC decision expected in 2014

Note:A 25 basis point change in the weighted-average ROE for UI’s transmission
business would impact net income by approximately $0.6M annually

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Electric Distribution

Electric Distribution Capex 2013-2022

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qPrevious ‘12-’21 forecast
$1.2B

qCapEx spend for storm
preparedness - mainly
system hardening

Amounts may not add due to rounding

Examples of Electric Distribution Projects

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Distribution Transformer
Replacement Program

New Haven/East Haven
Load Relief Project

Bridgeport Fuel Cell
Energy Project

§Infrastructure program to
replace transformers due to
physical condition,
capacity, or potentially
high levels of PCBs

§In progress

§Annual program for 10
years

~ $6M per year

§Provide circuit relieffor
areas of New Haven and
East Haven through
construction of
underground path

§In progress

~ $11.5M

§Install 3 interconnections for
15.5 MW Fuel Cell
Generation Facility via 3
dedicated underground
express feeders

§In progress

~ $10M**

**Customer project that is partially reimbursable

Financials

YTD 2012 Financial Results by Business

EPS

YTD ‘12 vs. YTD ‘11

Net Income

YTD ‘12 vs. YTD ‘11

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Amounts may not add due to rounding

qReflects YTD 3Q ‘12 financial results

q‘12 goal of converting 10,200 customers to natural gas heat

qExecution of capital expenditure plan at each of our regulated businesses

qFocused short-term O&M cost controls at each of our regulated businesses

qAssumes normal weather through the rest of ’12

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2013 earnings
expectations will
be discussed on the
4Q ‘12 earnings call

CT & MA State Regulatory

State Regulatory Update

Connecticut

qDistribution Rate Case

§UI is evaluating timing of distribution rate case to reflect significant investments in distribution
infrastructure

qUtility Company Storm Response

§Pursuant to CT legislation, PURA will review UI’s performance following Hurricane Sandy

qGenConn

§Filed a rate case request seeking approval of 2013 revenue requirements of $73.5M

§Decision expected by the end of the year

qRenewable Connections Program

§Reopened proceeding currently in progress

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Massachusetts

qMandated rate cases every 5 years for electric utilities and 10 years for natural gas LDCs

Conclusion

Why UIL……..

Pure-play
electric&gas
utilities

§Virtually 100% regulated

§Electric distribution & transmission and gas distribution utilities -
complementary earnings patterns

§Earnings growth opportunities at both electric and gas operations

Financial
strategy

§Commitment to investment grade credit profile

§Consistent history of dividend payments

§Objective is to achieve allowed ROEs

§Focused on controlling costs

High probability
growth

§$3.5 billion 10-year capital expenditure program

§Natural gas expansion through customer conversions

§Growth opportunities in electric transmission and distribution

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Questions?

Appendices

2012 Earnings Highlights

q3Q ‘12 net income of $15.7M - 29% increase compared to 3Q ’11

qYTD ‘12 net income of $74.8M was below YTD ‘11 levels mainly due to warmer
weather in the first six months of ‘12

qYTD ‘12 pre-tax earnings from UI’s equity investment in GenConn of $11.8M,
compared to $8.2M YTD ‘11, an increase of $3.6M

§Middletown plant became fully operational in June ’11

qContinued progress on gas conversion growth initiative - on target to meet ‘12 goal

§Converted 61% more customers YTD Oct. ’12, compared to YTD Oct. ’11

qYTD ‘12 pre-tax income of $1.1M on deposits in NEEWS, no income recordedYTD
’11

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Debt Maturities, Liquidity & Credit Ratings

Evaluating the impact of DEEP’s
Comprehensive Energy Strategy, PURA’s
Renewable Generation Resources decision,
current business plans and market conditions
to determine potential timing and need for
external equity

*

Available Liquidity

Debt Maturities ($M)

Credit Ratings

* UIL closed on an additional $100 million credit agreement on 10/31/12.

Breakdown of Gas - Rate Base (2012-2017)

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$M

Forecast includes 338 (H)(10) election

Amounts may not add due to rounding

2012-2017

CAGR 5.2%

Previous - UIL 2012-2021
Capital Expenditure Forecast

Does not include potential to construct, own and operate up to 10MW of Class I renewable generation.

** Not including GenConn

Amounts may not add due to rounding

qIdentified projects with clear need

qFull 10-yr forecast for Gas Distribution CapEx

qIT-related shared services projects are in UIL Corporate

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Previous 2011-2016
Average Rate Base Forecast (excluding GenConn)

GenConn Equity Investments:

$M

Amounts may not add due to rounding.

2011-2016

CAGR 6.9%

Gas

Distribution:

3.6%

Electric

Transmission:

10.2%

Electric

Distribution:

11.1%

$2,062

$2,235

$2,388

$2,535

$2,731

1%

41%

22%

36%

40%

22%

38%

40%

22%

38%

38%

24%

38%

2%

43%

22%

33%

4%

42%

21%

33%

$1,956

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CT RPS

Connecticut RPS Requirements

(Percentage of Retail Load)

Class 1 resources include energy derived from solar, wind, fuel cell, methane gas from landfills, ocean thermal, wave,
tidal, run-of-river hydropower (<5MW, began operation after July 1, 2003), sustainable biomass (NOx emission <0.075
lbs/MMBtu of heat input)

Class 2 resources include other biomass (NOx emission <0.2 lbs/MMBtu of heat input, began operation before July 1,
1998), small run-of-river hydroelectric (<5MW, began operation before July 1, 2003) and municipal solid waste trash-to-
energy facilities.

Class 3 include customer-sited combined heat and power (with operating efficiency >50% of facilities installed after
January 1, 2006), waste heat recovery systems (installed on or after April 1, 2007), electricity savings from conservation
and load management programs (began on or after January 1, 2006)

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