Alliant Energy Announces First Quarter 2013 Results

             Alliant Energy Announces First Quarter 2013 Results

Reaffirms 2013 earnings guidance

PR Newswire

MADISON, Wis., May 3, 2013

MADISON, Wis., May3, 2013 /PRNewswire/ --Alliant Energy Corporation (NYSE:
LNT) today announced first quarter U.S. generally accepted accounting
principles (GAAP) and non-GAAP consolidated unaudited earnings per share (EPS)
from continuing operations as follows:

                        Adjusted (non-GAAP) EPS from  GAAP EPS from Continuing
                        Continuing Operations         Operations
                        Q1 2013          Q1 2012      Q1 2013        Q1 2012
Utility and Corporate   $0.66            $0.38        $0.60          $0.24
Services
Non-regulated and       0.06             0.12         0.06           0.12
Parent
Alliant Energy          $0.72            $0.50        $0.66          $0.36
Consolidated

(Logo: http://photos.prnewswire.com/prnh/20020405/LNTLOGO)

"I am pleased with the solid financial results produced in the first quarter
of 2013," said Patricia Kampling, Alliant Energy Chairman, President and
CEO."The results reflect our financial discipline and focus on earning our
authorized returns while managing rate impacts to our customers."

Utility and Corporate Services - Alliant Energy's Utility and Alliant Energy
Corporate Services, Inc. (Corporate Services) operations generated $0.66 per
share of non-GAAP EPS from continuing operations in the first quarter of 2013,
which was $0.28 per share higher than the first quarter of 2012.First quarter
of 2013 weather was only slightly cooler than normal, but when compared to
last year's record warm winter, the utilities realized a positive impact on
electric and gas sales of $0.14 per share. Higher income from Interstate Power
and Light Company's (IPL's) tax benefit riders also positively impacted 2013
first quarter earnings, but is not expected to have a material impact on 2013
total year earnings.

Non-regulated and Parent - Alliant Energy's non-regulated and parent
operations generated $0.06 per share of non-GAAP EPS from continuing
operations in the first quarter of 2013, which was $0.06 per share lower than
the first quarter of 2012.Lower income at the parent business from the
impacts of IPL's tax benefit riders contributed to the lower non-regulated and
parent earnings for the first quarter of 2013, but is not expected to have a
material impact on 2013 total year earnings.Anticipated losses related to the
Franklin County wind project also contributed to lower quarter-over-quarter
earnings.

Earnings Adjustments - First quarter 2013 non-GAAP EPS excludes charges of
$0.06 per share resulting from IPL's and WPL's preferred stock
redemptions.First quarter 2012 non-GAAP EPS excludes charges of $0.14 per
share from adjustments consisting of increased tax obligations at the
utilities due to state apportionment changes caused by the RMT sale.Non-GAAP
adjustments, which relate to material charges or income that are not normally
associated with ongoing operations, are provided as a supplement to results
reported in accordance with GAAP. Refer to page 5 of this document for
additional details of the earnings adjustments for the first quarters of 2013
and 2012.

Details regarding GAAP EPS from continuing operations variances between the
first quarters of 2013 and 2012 for Alliant Energy's operations are as
follows:

                               GAAP EPS
                               Q1 2013  Q1 2012
Utility and Corporate Services $0.60    $0.24
Non-regulated and Parent       0.06     0.12
Alliant Energy Consolidated    $0.66    $0.36



                                                    Q1 2013  Q1 2012  Variance
Utility and Corporate Services operations:
Non-recurring state income tax impacts in 2012      $—       ($0.14)  $0.14
Weather impact on electric and gas sales            0.02     (0.12)   0.14
Electric and gas tax benefit riders impact at IPL   (0.02)   (0.09)   0.07
(timing between quarters)
Charges associated with preferred stock redemptions (0.06)   —        (0.06)
at IPL and WPL in 2013
Higher depreciation expense (primarily related to                     (0.04)
Riverside)
Capacity charges related to Riverside in 2012       —        (0.03)   0.03
Revenue requirement adjustment related to tax       0.03     —        0.03
benefits at IPL
Lower energy conservation cost recovery                               0.03
amortizations at WPL
Retail gas base rate changes effective in January                     (0.02)
2013
Other                                                                 0.04
Total Utility and Corporate Services operations                       $0.36
Non-regulated and Parent operations:
Electric and gas tax benefit riders impact at       0.02     0.06     ($0.04)
Parent (timing between quarters)
Franklin County wind project losses in 2013                           (0.02)
Total Non-regulated and Parent operations                             ($0.06)

Non-recurring state income tax impacts in 2012 - Alliant Energy utilizes state
apportionment projections to record its deferred tax assets and liabilities
for each reporting period.These state apportionment projections are
significantly impacted by the estimated amount of revenues expected in the
future from each state jurisdiction for Alliant Energy's consolidated tax
group, including both its regulated and non-regulated operations.The
forecasted amount of revenues from each state jurisdiction for Alliant
Energy's consolidated tax group changed materially in the first quarter of
2012 due to the planned sale of the RMT business. The change in the state
apportionment projections resulted in non-recurring state income tax charges
of $15 million ($8 million at IPL and $7 million at WPL), or $0.14 per share
in the first quarter of 2012.The sale of RMT was completed in the first
quarter of 2013 and no further tax apportionment adjustments are anticipated
as a result of the sale of RMT.

Weather impact on electric and gas sales - Weather in Alliant Energy's service
territory in the first quarter of 2012 was among the warmest on record with
approximately 22 percent fewer heating degree days than normal.The impact of
the mild weather on Alliant Energy's electric and gas sales in the first
quarter of 2012 was estimated to be a $22 million reduction in electric and
gas margins, or $0.12 per share. During the first quarter of 2013, weather was
cooler than normal resulting in increased earnings of $0.02 per share.

Electric and gas tax benefit riders - In 2011 and 2012, IPL received rate
orders from the Iowa Utilities Board authorizing IPL to implement its proposed
electric and gas tax benefit riders, respectively, which utilize income tax
benefits from certain tax initiatives to provide retail electric and gas
customers in Iowa credits on their electric bills. These credits on customers'
electric bills reduced IPL's electric revenues by $83 million during
2012.Credits on customers' electric and gas bills are expected to reduce
IPL's electric and gas revenues by approximately $56 million and $12 million,
respectively, during calendar year 2013.Due to timing of the tax credits, the
tax benefit riders result in considerable quarter-over-quarter variation in
EPS at IPL as well as the Parent.The credit on customer bills is based on
kilowatt-hour usage (electric) and a monthly distribution charge (gas), which
are fairly consistent throughout the year. However, the offsetting tax
benefits are recorded as a percentage of expected earnings for IPL and for
Alliant Energy each quarter, which fluctuate significantly causing the
considerable quarter-over-quarter variation. The following table shows the
estimated quarterly impacts of the tax benefit riders on EPS at IPL and the
Parent for 2013 and 2012:

                       Q1-13    Q2-13    Q3-13   Q4-13    2013
IPL - electric and gas ($0.02)  ($0.07)  $0.14   ($0.05)  $—
Parent                 0.02     0.03     (0.08)  0.03     —
                       $—       ($0.04)  $0.06   ($0.02)  $—
                       Q1-12    Q2-12    Q3-12   Q4-12    2012
IPL - electric         ($0.09)  ($0.05)  $0.18   ($0.04)  $—
Parent                 0.06     0.04     (0.12)  0.02     —
                       ($0.03)  ($0.01)  $0.06   ($0.02)  $—

Revenue requirement adjustment related to tax benefits at IPL - In February
2013, the IUB issued an order allowing IPL to recognize a revenue requirement
adjustment related to certain tax benefits from tax accounting method changes.

2013 Earnings Guidance

Alliant Energy is reaffirming its 2013 earnings per share guidance as follows:

Utility and Corporate Services $2.90 - $3.10
Non-regulated and Parent       0.05 - 0.15
Alliant Energy Consolidated    $2.95 - $3.25

The 2013 earnings guidance does not include the impacts of any non-cash
valuation adjustments, regulatory-related charges or credits, reorganization
or restructuring charges, discontinued operations, future changes in laws or
regulations, charges related to preferred stock redemptions, adjustments made
to deferred tax assets and liabilities from valuation allowances, pending
lawsuits and disputes, federal and state income tax audits and other Internal
Revenue Service proceedings or changes in generally accepted accounting
principles that may impact the reported results of Alliant Energy.

Drivers for Alliant Energy's 2013 earnings guidance include, but are not
limited to:

  oStable economy and resulting implications on utility sales
  oNormal weather and operating conditions in its utility service territories
    for the remainder of the year
  oAbility of IPL and WPL to earn their authorized rates of return
  oAbility of WPL to recover future purchased power, fuel and fuel-related
    costs through rates in a timely manner
  oContinuing cost controls and operational efficiencies
  oExecution of IPL's and WPL's capital expenditure plans
  oConsolidated effective tax rate of 13%

Earnings Conference Call

A conference call to review the first quarter of 2013 results is scheduled for
Friday, May 3rd at 9:00 a.m. central time. Alliant Energy Chairman, President
and Chief Executive Officer Patricia Kampling and Chief Financial Officer Tom
Hanson will host the call.The conference call is open to the public and can
be accessed in two ways.Interested parties may listen to the call by dialing
888-221-9591 (United States or Canada) or 913-312-1434 (International),
passcode 8244179. Interested parties may also listen to a webcast at
www.alliantenergy.com/investors. In conjunction with the information in this
earnings announcement and the conference call, Alliant Energy posted
supplemental materials on its website.A replay of the call will be available
through May10, 2013, at 888-203-1112 (United States or Canada) or
719-457-0820 (International), passcode 8244179. An archive of the webcast will
be available on the Company's Web site at www.alliantenergy.com/investorsfor
12 months.

Alliant Energy is the parent company of two public utility companies -
Interstate Power and Light Company and Wisconsin Power and Light Company - and
of Alliant Energy Resources, LLC, the parent company of Alliant Energy's
non-regulated operations.Alliant Energy is an energy-services provider with
utility subsidiaries serving approximately 1 million electric and 415,000
natural gas customers. Providing its customers in the Midwest with regulated
electricity and natural gas service is the Company's primary focus.Alliant
Energy, headquartered in Madison, Wis., is a Fortune 1000 company traded on
the New York Stock Exchange under the symbol LNT. For more information, visit
the Company's Web site at www.alliantenergy.com.

This press release includes forward-looking statements.These forward-looking
statements can be identified as such because the statements include words such
as "expect," "anticipate," "plan," or other words of similar
import.Similarly, statements that describe future financial performance or
plans or strategies are forward-looking statements.Such forward looking
statements are subject to certain risks and uncertainties that could cause
actual results to differ materially from those expressed in, or implied by,
such statements. Actual results could be materially affected by the following
factors, among others:

  ofederal and state regulatory or governmental actions, including the impact
    of energy, tax, financial and health care legislation, and of regulatory
    agency orders;
  oIPL's and WPL's ability to obtain adequate and timely rate relief to allow
    for, among other things, the recovery of operating costs, fuel costs,
    transmission costs, deferred expenditures, capital expenditures, and
    remaining costs related to generating units that may be permanently
    closed, earning their authorized rates of return, and the payments to
    their parent of expected levels of dividends;
  othe ability to continue cost controls and operational efficiencies;
  othe impact of IPL's retail electric base rate freeze in Iowa through 2013;
  othe impact of WPL's retail electric and gas base rate freeze in Wisconsin
    through 2014;
  oweather effects on results of utility operations including impacts of
    temperature changes in IPL's and WPL's service territories on customers'
    demand for electricity and gas;
  othe impact of the economy in IPL's and WPL's service territories and the
    resulting impacts on sales volumes, margins and the ability to collect
    unpaid bills;
  othe impact of energy efficiency, franchise retention and customer owned
    generation on sales volumes and margins;
  odevelopments that adversely impact Alliant Energy's, IPL's and WPL's
    ability to implement their strategic plan, including unanticipated issues
    with new emission controls equipment for various coal-fired generating
    facilities of IPL and WPL, IPL's construction of its proposed natural
    gas-fired electric generating facility in Iowa, Alliant Energy Resources,
    LLC's selling price of the electricity output from its 100 megawatt
    Franklin County wind project, and the potential decommissioning of certain
    generating facilities of IPL and WPL;
  oissues related to the availability of generating facilities and the supply
    and delivery of fuel and purchased electricity and the price thereof,
    including the ability to recover and to retain the recovery of purchased
    power, fuel and fuel-related costs through rates in a timely manner;
  othe impact that fuel and fuel-related prices may have on IPL's and WPL's
    customers' demand for utility services;
  oissues associated with environmental remediation and environmental
    compliance, including final approval of and compliance with the Consent
    Decree between WPL, the Sierra Club and the U.S. Environmental Protection
    Agency (EPA), future changes in environmental laws and regulations and
    litigation associated with environmental requirements;
  othe ability to defend against environmental claims brought by state and
    federal agencies, such as the EPA, or third parties, such as the Sierra
    Club;
  othe ability to recover through rates all environmental compliance and
    remediation costs, including costs for projects put on hold due to
    uncertainty of future environmental laws and regulations;
  othe direct or indirect effects resulting from terrorist incidents,
    including cyber terrorism, or responses to such incidents;
  othe impact of a failure to maintain the security of personally
    identifiable information, including associated costs to notify affected
    persons and to mitigate their information security concerns;
  oimpacts of future tax benefits from deductions for repairs expenditures
    and mixed service costs and temporary differences from historical tax
    benefits from such deductions that are included in rates when the
    differences reverse in future periods;
  oany material post-closing adjustments related to any past asset
    divestitures, including the sale of RMT, Inc.;
  ocontinued access to the capital markets on competitive terms and rates,
    and the actions of credit rating agencies;
  oinflation and interest rates;
  ochanges to the creditworthiness of counterparties with which Alliant
    Energy, IPL and WPL have contractual arrangements, including participants
    in the energy markets and fuel suppliers and transporters;
  oissues related to electric transmission, including operating in Regional
    Transmission Organization (RTO) energy and ancillary services markets, the
    impacts of potential future billing adjustments and cost allocation
    changes from RTOs and recovery of costs incurred;
  ounplanned outages, transmission constraints or operational issues
    impacting fossil or renewable generating facilities and risks related to
    recovery of resulting incremental costs through rates;
  oAlliant Energy's ability to successfully pursue appropriate appeals with
    respect to, and any liabilities arising out of, the alleged violation of
    the Employee Retirement Income Security Act of 1974 by the Alliant Energy
    Cash Balance Pension Plan;
  ocurrent or future litigation, regulatory investigations, proceedings or
    inquiries;
  oAlliant Energy's ability to sustain its dividend payout ratio goal;
  oemployee workforce factors, including changes in key executives,
    collective bargaining agreements and negotiations, work stoppages or
    additional restructurings;
  oimpacts that storms or natural disasters, including floods, droughts and
    forest or prairie fires, in IPL's and WPL's service territories may have
    on their operations and recovery of, and rate relief for, costs associated
    with restoration activities;
  othe impact of distributed generation in IPL's and WPL's service
    territories on system reliability, operating expenses and customers'
    demand for electricity;
  oaccess to technological developments;
  omaterial changes in retirement and benefit plan costs;
  othe impact of performance-based compensation plans accruals;
  othe effect of accounting pronouncements issued periodically by
    standard-setting bodies;
  othe impact of changes to production tax credits for wind projects;
  othe impact of adjustments made to deferred tax assets and liabilities from
    state apportionment assumptions;
  othe ability to utilize tax credits and net operating losses generated to
    date, and those that may be generated in the future, before they expire;
  othe ability to successfully complete tax audits, changes in tax accounting
    methods and appeals with no material impact on earnings and cash flows;
    and
  ofactors listed in the "2013 Earnings Guidance" sections of this press
    release.

Without limitation, the expectations with respect to 2013 earnings guidance in
this press release are forward-looking statements and are based in part on
certain assumptions made by Alliant Energy, some of which are referred to in
the forward-looking statements. Alliant Energy cannot provide any assurance
that the assumptions referred to in the forward-looking statements or
otherwise are accurate or will prove to be correct.Any assumptions that are
inaccurate or do not prove to be correct could have a material adverse effect
on Alliant Energy's ability to achieve the estimates or other targets included
in the forward-looking statements. The forward-looking statements included
herein are made as of the date hereof and Alliant Energy undertakes no
obligation to update publicly such statements to reflect subsequent events or
circumstances.

Note: Unless otherwise noted, all "per share" references in this release refer
to earnings per diluted share.

ALLIANT ENERGY CORPORATION
FIRST QUARTER 2013 EARNINGS SUMMARY
A summary of Alliant Energy's first quarter 2013 results compared to first
quarter 2012 results is as follows:
EPS:                   GAAP EPS             Adjustments       Non-GAAP EPS
                       Q1 2013    Q1 2012   Q1 2013  Q1 2012  Q1 2013  Q1 2012
IPL                    $0.21      ($0.04)   $0.05    $0.08    $0.26    $0.04
WPL                    0.38       0.28      0.01     0.06     0.39     0.34
Corporate Services     0.01       —         —        —        0.01     —
Subtotal for Utility   0.60       0.24      0.06     0.14     0.66     0.38
and Corporate Services
Non-regulated and      0.06       0.12      —        —        0.06     0.12
Parent
EPS from continuing    0.66       0.36      0.06     0.14     0.72     0.50
operations
EPS from discontinued  (0.03)     (0.04)    —        —        (0.03)   (0.04)
operations
Alliant Energy         $0.63      $0.32     $0.06    $0.14    $0.69    $0.46
Consolidated



Earnings (in millions): GAAP Income (Loss)  Adjustments       Non-GAAP Income
                                                              (Loss)
                        Q1 2013    Q1 2012  Q1 2013  Q1 2012  Q1 2013  Q1 2012
IPL                     $22.9      ($4.7)   $5.4     $8.1     $28.3    $3.4
WPL                     42.0       31.1     1.0      7.0      43.0     38.1
Corporate Services      1.5        —        —        —        1.5      —
Subtotal for Utility    66.4       26.4     6.4      15.1     72.8     41.5
and Corporate Services
Non-regulated and       6.5        12.9     —        0.1      6.5      13.0
Parent
Total earnings from     72.9       39.3     6.4      15.2     79.3     54.5
continuing operations
Loss from discontinued  (3.0)      (4.4)    —        —        (3.0)    (4.4)
operations
Alliant Energy          $69.9      $34.9    $6.4     $15.2    $76.3    $50.1
Consolidated

Adjusted, or non-GAAP, operating earnings for the first quarters of 2013 and
2012 do not include the following items (after-tax) that were included in the
reported GAAP earnings:

                                   Non-GAAP Income (Loss)     Non-GAAP EPS
                                   Adjustments (in millions)  Adjustments
                                   Q1 2013        Q1 2012     Q1 2013  Q1 2012
Utility and Corporate Services
Operations:
Charges associated with preferred  ($6.4)         $—          ($0.06)  $—
stock redemptions at IPL and WPL
Non-recurring state income tax     —              (15.1)      —        (0.14)
impacts
Subtotal for Utility and Corporate (6.4)          (15.1)      (0.06)   (0.14)
Services Operations
Non-regulated and Parent
Operations:
Non-recurring state income tax     —              (0.1)       —        —
impacts
Subtotal for Non-regulated and     —              (0.1)       —        —
Parent Operations
Alliant Energy Consolidated        ($6.4)         ($15.2)     ($0.06)  ($0.14)



ALLIANT ENERGY CORPORATION

CONSOLIDATED STATEMENTS OF INCOME (Unaudited)
                                                  Three Months Ended March 31,
                                                  2013              2012
                                                  (in millions)
Operating revenues:
Utility:
Electric                                          $633.2            $572.4
Gas                                               197.3             167.1
Other                                             17.2              13.7
Non-regulated                                     11.9              12.5
                                                  859.6             765.7
Operating expenses:
Utility:
Electric production fuel and energy purchases     179.1             159.9
Purchased electric capacity                       57.0              61.5
Electric transmission service                     103.7             81.4
Cost of gas sold                                  128.0             104.8
Other operation and maintenance                   150.2             150.0
Non-regulated operation and maintenance           2.2               4.2
Depreciation and amortization                     92.6              83.0
Taxes other than income taxes                     26.1              25.3
                                                  738.9             670.1
Operating income                                  120.7             95.6
Interest expense and other:
Interest expense                                  42.6              38.9
Equity income from unconsolidated investments,    (10.7)            (9.4)
net
Allowance for funds used during construction      (5.6)             (3.8)
Interest income and other                         (0.8)             (1.1)
                                                  25.5              24.6
Income from continuing operations before income   95.2              71.0
taxes
Income taxes                                      12.1              27.7
Income from continuing operations, net of tax     83.1              43.3
Loss from discontinued operations, net of tax     (3.0)             (4.4)
Net income                                        80.1              38.9
Preferred dividend requirements of subsidiaries   10.2              4.0
Net income attributable to Alliant Energy common  $69.9             $34.9
shareowners



ALLIANT ENERGY CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)
                                                 March31, 2013  Dec. 31, 2012
                                                 (in millions)
ASSETS:
Property, plant and equipment:
Utility plant in service, net of accumulated     $6,927.3        $6,942.3
depreciation
Utility construction work in progress            513.3           418.8
Other property, plant and equipment, net of      473.0           476.9
accumulated depreciation
Current assets:
Cash and cash equivalents                        53.4            21.2
Other current assets                             817.0           973.1
Investments                                      321.6           319.0
Other assets                                     1,628.3         1,634.2
Total assets                                     $10,733.9       $10,785.5
CAPITALIZATION AND LIABILITIES:
Capitalization:
Alliant Energy Corporation common equity         $3,145.9        $3,134.9
Cumulative preferred stock of subsidiaries, net  200.0           205.1
Noncontrolling interest                          1.8             1.8
Long-term debt, net (excluding current portion)  3,121.9         3,136.6
Total capitalization                             6,469.6         6,478.4
Current liabilities:
Current maturities of long-term debt             1.5             1.5
Commercial paper                                 243.4           217.5
Other current liabilities                        793.2           801.0
Other long-term liabilities and deferred credits 3,226.2         3,287.1
Total capitalization and liabilities             $10,733.9       $10,785.5



ALLIANT ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
                                                  Three Months Ended March 31,
                                                  2013             2012
                                                  (in millions)
Cash flows from operating activities              $198.6           $215.0
Cash flows used for investing activities:
Construction and acquisition expenditures:
Utility business                                  (153.2)          (122.1)
Alliant Energy Corporate Services, Inc. and       (14.1)           (13.5)
non-regulated businesses
Proceeds from Franklin County wind project cash   62.4             —
grant
Other                                             (14.8)           0.5
Net cash flows used for investing activities      (119.7)          (135.1)
Cash flows used for financing activities:
Common stock dividends                            (52.2)           (49.9)
Proceeds from issuance of preferred stock         200.0            —
Payments to redeem preferred stock                (211.0)          —
Net change in commercial paper                    10.9             (20.8)
Other                                             5.6              10.3
Net cash flows used for financing activities      (46.7)           (60.4)
Net increase in cash and cash equivalents         32.2             19.5
Cash and cash equivalents at beginning of period  21.2             11.4
Cash and cash equivalents at end of period        $53.4            $30.9



KEY FINANCIAL STATISTICS
                                         March 31, 2013  March 31, 2012
Common shares outstanding (000s)         110,922         110,962
Book value per share                     $28.36          $27.01
Quarterly common dividend rate per share $0.47           $0.45



KEY OPERATING STATISTICS
                                                 Three Months Ended March 31,
                                                 2013              2012
Utility electric sales (000s of MWh)
Residential                                      2,049             1,863
Commercial                                       1,545             1,515
Industrial                                       2,697             2,815
Retail subtotal                                  6,291             6,193
Sales for resale:
Wholesale                                        884               757
Bulk power and other                             151               85
Other                                            40                37
Total                                            7,366             7,072
Utility retail electric customers (at March 31)
Residential                                      845,409           842,830
Commercial                                       137,823           136,924
Industrial                                       2,864             2,857
Total                                            986,096           982,611
Utility gas sold and transported (000s of Dth)
Residential                                      13,886            10,527
Commercial                                       8,967             7,103
Industrial                                       996               952
Retail subtotal                                  23,849            18,582
Transportation / other                           16,459            13,120
Total                                            40,308            31,702
Utility retail gas customers (at March 31)
Residential                                      369,791           367,849
Commercial                                       45,830            45,673
Industrial                                       449               494
Total                                            416,070           414,016
Estimated margin increases (decreases) from impacts of weather (in millions) -
                                                 Three Months Ended March 31,
                                                 2013              2012
Electric margins                                 $3                ($12)
Gas margins                                      1                 (10)
Total weather impact on margins                  $4                ($22)



                                Three Months Ended March 31,
                                2013     2012    Normal ^(a)
Heating degree days (HDDs) ^(a)
Cedar Rapids, Iowa (IPL)        3,521    2,692   3,425
Madison, Wisconsin (WPL)        3,745    2,717   3,511
Cooling degree days (CDDs) ^(a)
Cedar Rapids, Iowa (IPL)        —        28      1
Madison, Wisconsin (WPL)        —        26      —

^(a) HDDs and CDDs are calculated using a simple average of the high and low
temperatures each day compared to a 65 degree base. Normal degree days are
calculated using a rolling 20-year average of historical HDDs and CDDs.

SOURCE Alliant Energy Corporation

Website: http://www.alliantenergy.com
Contact: Scott Reigstad,+1-608-458-3145, Investor Relations, Susan Gille,
+1-608-458-3956
 
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