Alliant Energy Announces Third Quarter 2012 Results, 2013 Earnings Guidance and Increased Annual Common Stock Dividend Target

 Alliant Energy Announces Third Quarter 2012 Results, 2013 Earnings Guidance
          and Increased Annual Common Stock Dividend Target for 2013

Updates 2012 earnings guidance and forecasted 2012 - 2016 capital expenditures

PR Newswire

MADISON, Wis., Nov. 9, 2012

MADISON, Wis., Nov.9, 2012 /PRNewswire/ --Alliant Energy Corporation (NYSE:
LNT) today announced third quarter U.S. generally accepted accounting
principles (GAAP) and non-GAAP consolidated earnings per share (EPS) from
continuing operations as follows:

                        Adjusted (non-GAAP) EPS from  GAAP EPS from Continuing
                        Continuing Operations         Operations
                        Q3 2012          Q3 2011      Q3 2012        Q3 2011
Utility and Corporate   $1.45            $1.37        $1.45          $1.35
Services
Non-regulated and       (0.11)           (0.12)       (0.11)         (0.12)
Parent
Alliant Energy          $1.34            $1.25        $1.34          $1.23
Consolidated

"The utilities and non-regulated businesses have produced solid results for
both the quarter and year-to-date. With one quarter remaining in 2012, we
have narrowed our 2012 annual earnings guidance to the top half of the
previous range," said Patricia Kampling, Alliant Energy Chairman, President
and CEO.

Utility and Corporate Services - Alliant Energy's Utility and Alliant Energy
Corporate Services, Inc. (Corporate Services) operations generated $1.45 per
share of non-GAAP EPS from continuing operations in the third quarter of 2012,
which was $0.08 per share higher than the third quarter of 2011. Warmer
weather in the third quarter of 2012, when compared to the third quarter of
2011, led to higher electric sales to customers, positively impacting Alliant
Energy's utility business. Higher income from Interstate Power and Light
Company's (IPL's) tax benefit rider also impacted third quarter earnings, but
is not expected to have a material impact on 2012 total year earnings. These
positive EPS drivers were partially offset by higher depreciation and nuclear
purchased power capacity expense.

Non-regulated and Parent - Alliant Energy's non-regulated and parent
operations generated ($0.11) per share of non-GAAP EPS from continuing
operations in the third quarter of 2012, which was $0.01 per share higher than
the third quarter of 2011. Earnings for Alliant Energy's non-regulated and
parent businesses for the third quarters of 2012 and 2011 were negatively
impacted by the timing of tax expense at the parent primarily due to IPL's tax
benefit rider. The increase in EPS was primarily due to higher earnings
generated by Alliant Energy's Transportation business.

Earnings Adjustments - Third quarter 2011 GAAP earnings were adjusted to
exclude $2.1 million ($0.02 per share) of charges for emission allowance
contracts impacted by the Cross-State Air Pollution Rule. 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.

Details regarding GAAP EPS from continuing operations variances between the
third quarters of 2012 and 2011 for Alliant Energy's operations are as
follows:

                               Q3 GAAP EPS
                               2012    2011
Utility and Corporate Services $1.45   $1.35
Non-regulated and Parent       (0.11)  (0.12)
Alliant Energy Consolidated    $1.34   $1.23



                                                    Q3 2012  Q3 2011  Variance
Utility and Corporate Services operations:
Electric tax benefit rider impact at IPL (timing    $0.18    $0.12    $0.06
between quarters)
Positive weather impact on electric sales           0.20     0.16     0.04
WPL retail fuel cost recoveries                     0.01     (0.02)   0.03
Charges for emission allowance contracts in Q3 2011 —        (0.02)   0.02
AFUDC related to emission control projects at WPL   0.02     —        0.02
in Q3 2012
Capacity charges for nuclear purchased power        (0.31)   (0.29)   (0.02)
agreements
Contract cancellation charge at IPL in Q3 2012      (0.02)   —        (0.02)
Higher depreciation expense                                           (0.02)
Other                                                                 (0.01)
Total Utility and Corporate Services operations                       $0.10
Non-regulated and Parent operations:
Electric tax benefit rider impact at Parent (timing ($0.12)  ($0.10)  ($0.02)
between quarters)
Other effective tax rate adjustments at Parent      (0.03)   (0.05)   0.02
(timing between quarters)
Other (includes Transportation business results)                      0.01
Total Non-regulated and Parent operations                             $0.01

Electric tax benefit rider - In February 2011, IPL received a rate order from
the Iowa Utilities Board authorizing IPL to implement its proposed electric
tax benefit rider, which utilizes income tax benefits from certain tax
initiatives to provide retail electric customers in Iowa credits on their
electric bills. These credits on customers' electric bills reduced IPL's
electric revenues by $61 million during 2011 and are expected to reduce IPL's
electric revenues by approximately $80 million during calendar year 2012. The
electric tax benefit rider also results in an equivalent reduction in IPL's
income tax expense from the benefits of the tax initiatives, resulting in no
material impact on 2011 and 2012 total year EPS. While the electric tax
benefit rider is not expected to have a material impact on total year EPS, it
does 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, which is 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 fluctuates significantly
causing the considerable quarter-over-quarter variation. The following table
shows the estimated quarterly impacts of the electric tax benefit rider on EPS
at IPL and the Parent for 2012 and 2011:

       Q1-12    Q2-12    Q3-12   Q4-12    2012
IPL    ($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)  $—



       Q1-11  Q2-11    Q3-11   Q4-11    2011
IPL    $0.02  ($0.09)  $0.12   ($0.05)  $—
Parent 0.02   0.04     (0.10)  0.04     —
       $0.04  ($0.05)  $0.02   ($0.01)  $—



2012 Earnings Guidance

Alliant Energy is narrowing its 2012 earnings guidance, which excludes a
charge of $0.14 per share associated with state tax apportionment changes at
the utilities resulting from the planned sale of RMT and non-recurring
regulatory-related credits of $0.02 per share from the PSCW rate case decision
discussed in the first and second quarter releases.

                               Revised       Previous
Utility and Corporate Services $2.75 - $2.85 $2.65 - $2.85
Non-regulated and Parent       0.15 - 0.20   0.10 - 0.20
Alliant Energy Consolidated    $2.90 - $3.05 $2.75 - $3.05

The 2012 earnings guidance does not include the impacts of any non-cash
valuation adjustments, regulatory-related charges or credits, reorganization
or restructuring charges, discontinued operations, changes in laws or
regulations, adjustments made to deferred tax assets and liabilities from
valuation allowances and state apportionment assumptions, pending lawsuits and
disputes, federal and state income tax audits and other Internal Revenue
Service proceedings or changes in accounting principles that may impact the
reported results of Alliant Energy.

Drivers for Alliant Energy's 2012 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
  oIncome tax benefits at IPL from tax initiatives
  oContinuing cost controls and operational efficiencies
  oExecution of IPL's, WPL's and Alliant Energy Resources, LLC's (Resources')
    capital expenditure plans
  oRMT sale execution
  oConsolidated effective tax rate of 20% (excluding the impacts of the
    non-recurring state income tax charge)

2013 Earnings Guidance

Alliant Energy is issuing the following earnings guidance for 2013:

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

"In 2013, we expect to see the earnings benefit of increasing WPL rate base
and AFUDC resulting from utility investments, as well as benefits from our
numerous tax initiatives," said Kampling. "However, we expect a decline in
non-regulated earnings for 2013 due to operating losses from our Franklin
County wind project."

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, changes in laws or
regulations, adjustments made to deferred tax assets and liabilities from
valuation allowances and state apportionment assumptions, pending lawsuits and
disputes, federal and state income tax audits and other Internal Revenue
Service proceedings or changes in 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
  oAbility of IPL and WPL to earn their authorized rates of return
  oRegulatory decisions impacting earnings at IPL from tax initiatives
  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 14%

2013 Annual Common Stock Dividend Target

Alliant Energy's Board of Directors approved an 8 cent increase in its 2013
expected annual common stock dividend target to $1.88 per share from the
current annual dividend target of $1.80 per share. Payment of the 2013
quarterly dividends is subject to the actual dividend declaration by the Board
of Directors, which is expected in January 2013 for the first quarter
dividend.

Projected Capital Expenditures

Alliant Energy has updated its projected capital expenditures for 2012 through
2016 as follows (in millions):

                                     2012    2013  2014  2015  2016
Utility business (a):
WPL gas - Riverside acquisition      $395    $—    $—    $—    $—
IPL gas - new facility               5       10    100   325   200
Total Generation - new facilities    400     10    100   325   200
Environmental                        290     355   210   200   165
Generation performance improvements  20      35    75    25    45
Other utility capital expenditures   335     380   410   405   410
Total utility business               1,045   780   795   955   820
Corporate Services (b)               60      40    45    30    20
Resources wind - Franklin County (b) 65      5     15    —     —
Other (b)                            10      10    5     5     5
                                     $1,180  $835  $860  $990  $845

     Cost estimates represent IPL's and WPL's estimated portion of total
(a) escalated construction and acquisition expenditures and exclude AFUDC, if
     applicable.
(b)  Cost estimates represent total escalated construction expenditures and
     exclude capitalized interest.



Earnings Conference Call

A conference call to review the third quarter of 2012 results, revised 2012
earnings guidance, 2013 earnings guidance and projected capital expenditures
is scheduled for Friday, November 9th 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 November 16, 2012, 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/investors for 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 414,000
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;
  oweather effects on results of utility operations including impacts of
    temperature changes and drought conditions in IPL's and WPL's service
    territories on customers' demand for electricity and gas;
  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
    during 2013 and 2014;
  othe state of the economy in IPL's and WPL's service territories and
    resulting implications on sales, margins and ability to collect unpaid
    bills;
  odevelopments that adversely impact Alliant Energy's, IPL's and WPL's
    ability to implement their strategic plans, including unanticipated issues
    with new emission control equipment for various coal-fired generating
    facilities of IPL and WPL, WPL's purchase of the Riverside Energy Center,
    IPL's construction of a new natural gas-fired electric generating facility
    in Iowa, IPL's new PPA with NextEra Energy Resources, LLC, Alliant Energy
    Resources, LLC's construction of and selling price of the electricity
    output from its new 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;
  othe ability to defend against environmental claims brought by state and
    federal agencies, such as the U.S. Environmental Protection Agency, or
    third parties, such as the Sierra Club;
  oissues associated with environmental remediation efforts and with
    environmental compliance generally, including changing environmental laws
    and regulations and litigation associated with changing environmental laws
    and regulations;
  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;
  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 reversing into income tax expense
    in future periods;
  othe impact of changes to government incentive elections for wind projects;
  othe ability to find a purchaser for RMT, to successfully negotiate a
    purchase agreement and to close the sale of RMT;
  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 Alliant Energy's
    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 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 direct or indirect effects resulting from terrorist incidents,
    including cyber terrorism, or responses to such incidents;
  oaccess to technological developments;
  oany material post-closing adjustments related to any past asset
    divestitures;
  omaterial changes in retirement and benefit plan costs;
  othe impact of incentive compensation plans accruals;
  othe effect of accounting pronouncements issued periodically by
    standard-setting bodies;
  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 "2012 Earnings Guidance" and "2013 Earnings
    Guidance" sections of this press release.

Without limitation, the expectations with respect to 2012 and 2013 earnings
guidance and 2012 - 2016 capital expenditures 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
THIRD QUARTER 2012 EARNINGS SUMMARY


A summary of Alliant Energy's third quarter 2012 results compared to third
quarter 2011 results is as follows:



EPS:                      GAAP EPS          Adjustments       Non-GAAP EPS
                          Q3 2012  Q3 2011  Q3 2012  Q3 2011  Q3 2012  Q3 2011
IPL                       $0.93    $0.89    $—       $0.02    $0.93    $0.91
WPL                       0.51     0.46     —        —        0.51     0.46
Corporate Services        0.01     —        —        —        0.01     —
Subtotal for Utility and  1.45     1.35     —        0.02     1.45     1.37
Corporate Services
Non-regulated and Parent  (0.11)   (0.12)   —        —        (0.11)   (0.12)
EPS from continuing       1.34     1.23     —        0.02     1.34     1.25
operations
EPS from discontinued     0.02     (0.13)   —        —        0.02     (0.13)
operations
Alliant Energy            $1.36    $1.10    $—       $0.02    $1.36    $1.12
Consolidated



Earnings (in millions): GAAP Income (Loss)  Adjustments       Non-GAAP Income
                                                              (Loss)
                        Q3 2012    Q3 2011  Q3 2012  Q3 2011  Q3 2012  Q3 2011
IPL                     $103.3     $98.3    $—       $2.1     $103.3   $100.4
WPL                     55.9       50.6     —        —        55.9     50.6
Corporate Services      1.3        —        —        —        1.3      —
Subtotal for Utility    160.5      148.9    —        2.1      160.5    151.0
and Corporate Services
Non-regulated and       (11.5)     (12.0)   —        —        (11.5)   (12.0)
Parent
Total earnings from     149.0      136.9    —        2.1      149.0    139.0
continuing operations
Income (loss) from      1.7        (14.9)   —        —        1.7      (14.9)
discontinued operations
Alliant Energy          $150.7     $122.0   $—       $2.1     $150.7   $124.1
Consolidated



ALLIANT ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF INCOME (Unaudited)
                                     Three Months Ended   Nine Months Ended

                                     Sep. 30,             Sep. 30,
                                     2012        2011     2012       2011
                                     (dollars in millions)
Operating revenues:
Utility:
Electric                             $815.3      $796.9   $2,000.3   $2,037.7
Gas                                  46.8        46.4     263.9      342.5
Other                                12.2        15.8     39.7       45.8
Non-regulated                        13.3        11.8     39.7       34.6
                                     887.6       870.9    2,343.6    2,460.6
Operating expenses:
Utility:
Electric production fuel and energy  221.6       215.3    550.4      590.0
purchases
Purchased electric capacity          84.0        80.2     216.2      205.2
Electric transmission service        94.9        88.9     255.7      242.6
Cost of gas sold                     17.7        19.8     141.1      211.0
Other operation and maintenance      144.7       147.1    432.6      476.6
Non-regulated operation and          3.7         4.7      8.6        13.3
maintenance
Depreciation and amortization        83.6        80.7     247.4      240.0
Taxes other than income taxes        23.7        24.8     73.5       74.6
                                     673.9       661.5    1,925.5    2,053.3
Operating income                     213.7       209.4    418.1      407.3
Interest expense and other:
Interest expense                     38.3        38.8     115.8      119.7
Equity income from unconsolidated    (10.4)      (10.1)   (30.4)     (29.6)
investments, net
Allowance for funds used during      (5.8)       (2.8)    (14.4)     (8.6)
construction
Interest income and other            (0.7)       (0.6)    (2.4)      (2.2)
                                     21.4        25.3     68.6       79.3
Income from continuing operations    192.3       184.1    349.5      328.0
before income taxes
Income taxes                         39.3        43.3     83.8       54.5
Income from continuing operations,   153.0       140.8    265.7      273.5
net of tax
Income (loss) from discontinued      1.7         (14.9)   (2.3)      (12.6)
operations, net of tax
Net income                           154.7       125.9    263.4      260.9
Preferred dividend requirements of   4.0         3.9      11.9       14.3
subsidiaries
Net income attributable to Alliant   $150.7      $122.0   $251.5     $246.6
Energy common shareowners



ALLIANT ENERGY CORPORATION
CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)
                                                  Sep. 30, 2012  Dec. 31, 2011
                                                  (in millions)
ASSETS:
Property, plant and equipment:
Utility plant in service, net of accumulated      $6,365.8       $6,322.4
depreciation
Utility construction work in progress             481.5          257.2
Other property, plant and equipment, net of       537.3          453.7
accumulated depreciation
Current assets:
Cash and cash equivalents                         41.1           11.4
Other current assets                              987.5          859.2
Investments                                       314.1          300.7
Other assets                                      1,523.6        1,483.3
Total assets                                      $10,250.9      $9,687.9
CAPITALIZATION AND LIABILITIES:
Capitalization:
Alliant Energy Corporation common equity          $3,116.0       $3,013.0
Cumulative preferred stock of subsidiaries, net   205.1          205.1
Noncontrolling interest                           1.7            1.8
Long-term debt, net (excluding current portion)   2,828.1        2,703.1
Total capitalization                              6,150.9        5,923.0
Current liabilities:
Current maturities of long-term debt              1.4            1.4
Commercial paper                                  70.4           102.8
Other current liabilities                         873.7          751.0
Other long-term liabilities and deferred credits  3,154.5        2,909.7
Total capitalization and liabilities              $10,250.9      $9,687.9



ALLIANT ENERGY CORPORATION
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
                                                    Nine Months Ended Sep. 30,
                                                    2012            2011
                                                    (in millions)
Cash flows from operating activities                $600.3          $612.7
Cash flows used for investing activities:
Construction and acquisition expenditures:
Utility business                                    (412.7)         (480.2)
Alliant Energy Corporate Services, Inc. and         (106.3)         (46.1)
non-regulated businesses
Other                                               1.3             19.9
Net cash flows used for investing activities        (517.7)         (506.4)
Cash flows used for financing activities:
Common stock dividends                              (149.6)         (141.1)
Net change in commercial paper                      17.6            (25.3)
Proceeds from issuance of long-term debt            75.0            0.4
Payments to redeem preferred stock                  —               (40.0)
Other                                               4.1             (13.9)
Net cash flows used for financing activities        (52.9)          (219.9)
Net increase (decrease) in cash and cash            29.7            (113.6)
equivalents
Cash and cash equivalents at beginning of period    11.4            159.3
Cash and cash equivalents at end of period          $41.1           $45.7



KEY FINANCIAL STATISTICS
                                         Sep. 30, 2012  Sep. 30, 2011
Common shares outstanding (000s)         110,987        110,982
Book value per share                     $28.08         $27.05
Quarterly common dividend rate per share $0.45          $0.425





KEY OPERATING STATISTICS
                                         Three Months Ended  Nine Months Ended

                                         Sep. 30,            Sep. 30,
                                         2012       2011     2012      2011
Utility electric sales (000s of MWh)
Residential                              2,290      2,243    5,887     5,948
Commercial                               1,762      1,705    4,811     4,726
Industrial                               3,020      3,021    8,699     8,628
Retail subtotal                          7,072      6,969    19,397    19,302
Sales for resale:
Wholesale                                987        918      2,522     2,573
Bulk power and other                     371        338      818       1,480
Other                                    37         37       111       112
Total                                    8,467      8,262    22,848    23,467
Utility retail electric customers (at
Sep. 30)
Residential                              843,672    841,772
Commercial                               137,485    136,528
Industrial                               2,847      2,898
Total                                    984,004    981,198
Utility gas sold and transported (000s
of Dth)
Residential                              1,542      1,541    14,830    19,234
Commercial                               1,797      1,788    11,183    13,534
Industrial                               618        735      2,033     2,866
Retail subtotal                          3,957      4,064    28,046    35,634
Transportation / other                   16,295     13,396   43,303    39,500
Total                                    20,252     17,460   71,349    75,134
Utility retail gas customers (at Sep.
30)
Residential                              366,543    364,984
Commercial                               45,263     45,197
Industrial                               455        544
Total                                    412,261    410,725
Margin increases (decreases) from net impacts of weather (in millions) -
                                         Three Months Ended  Nine Months Ended

                                         Sep. 30,            Sep. 30,
                                         2012       2011     2012      2011
Electric margins                         $36        $29      $37       $35
Gas margins                              1          1        (11)      5
Total weather impact on margins          $37        $30      $26       $40



                       Three Months Ended Sep. 30,  Nine Months Ended Sep. 30,
                       2012    2011    Normal ^(a)  2012    2011   Normal ^(a)
Cooling degree days
(CDDs) ^(a)
Cedar Rapids, Iowa     699     654     507          1,044   867    729
(IPL)
Madison, Wisconsin     731     612     442          1,067   804    618
(WPL)
Heating degree days
(HDDs) ^(a)
Cedar Rapids, Iowa     218     204     146          3,420   4,573  4,271
(IPL)
Madison, Wisconsin     212     216     183          3,581   4,804  4,530
(WPL)

      HDDs and CDDs are calculated using a simple average of the high and low
^(a) 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.



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SOURCE Alliant Energy Corporation

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