ALLIANT ENERGY PLANT IN NEED OF REPAIRS

One of Alliant Energy company’s key power plants has been out of service since September and is in need of $25
million in repairs. The Riverside plant outage came to light when the agenda for the state Public Service Commission
meeting was recently released.

The company says the thirteen-year-old plant near the Town of Beloit isn’t expected to restart until July. The
natural
gas-fueled facility shut down in September for regular maintenance. Alliant spokesman Scott Reigstad
says the
generating station wouldn’t restart properly when the utility tried to restart it in November. When operating, the plant produces enough electricity to power 450,000 homes.

ALLIANT ENERGY NAMES NEW VICE PRESIDENT OF WISCONSIN OPERATIONS

Patricia Kampling, Alliant Energy Corporation Chairman, President and Chief Executive Officer, has announced that
David de Leon has been named Vice President of Wisconsin Operations. In his role, de Leon will lead the company’s
Wisconsin energy delivery and generation operations. He will report directly to Doug Kopp, Senior Vice President of
Operations.

De Leon has extensive experience in the implementation and integration of large capital projects at Alliant Energy’s
generating stations. He most recently served as Director of Construction and oversaw numerous Wisconsin facility
performance improvements and air quality control projects.

He has been with Alliant Energy for thirty years and previously managed several generation facilities and served in
numerous project engineering positions. He holds an MBA from Edgewood College in Madison, Wisconsin, and a
Bachelor’s Degree in mechanical engineering from the University of Wisconsin – Platteville.

De Leon is a Wisconsin Registered Professional Engineer. He is a member of the American Society of Mechanical
Engineers, a member of the Leadership Greater Madison Alumni Association and is involved in initiatives with the
United Way of Dane County.

Columbia Energy Air Quality Improvements Begun

A groundbreaking celebration has marked the start
of a large environmental technology project at the
Columbia Energy Center near Portage, Wisconsin.
Alliant Energy, along with the facility’s co-owners,
Wisconsin Public Service and Madison Gas and
Electric, are installing another air quality control
system at the facility. Utility employees were joined
by project contractors, labor leaders and federal,
state and local officials at the event.

The co-owners are building a selective catalytic
reduction (SCR) system at Unit 2 to reduce nitrogen
oxides by at least 50 percent. The total investment in
the environmental technology is approximately $110
million, and during construction, it is expected to
employ up to 100 workers. The project is scheduled
for completion by the end of 2018.

The SCR system is the second major air quality control
system installed at the Columbia Energy Center in
recent years. In 2014 baghouse and scrubber systems
were completed on both Units 1 and 2, and they are
reducing mercury and sulfur dioxide by over 90
percent from previous levels. These air quality
improvement projects at Alliant Energy’s largest
generating stations are part of an overall plan to move
toward cleaner energy. The plan also includes retiring
older and less efficient facilities, building the natural
gas-fueled Riverside expansion near Beloit, Wis.,
additional renewable energy and continued investments
in energy efficiency.

ALLIANT ENERGY RELEASES 2016 SUSTAINABILITY REPORT

Alliant Energy Corporation has released its 2016 Corporate Sustainability Report detailing progress to advance clean energy and stewardship to customers, communities and employees. It is available at alliantenergy.com/sustainability. The information expands on past environmental reports and highlights a signi?cant reduction in nitrogen oxides (NOX), sulfur dioxide (SO2) and mercury emissions. The report contains a new target of reducing carbon dioxide (CO2) emissions 40 percent by 2030 from 2005 levels. CO2 emissions continue to decrease due to additional renewable energy, increased use of efficient natural gas-fired generation and the transition of coal generation facilities.

Wisconsin’s Largest Solar Project Delivering Power for Alliant

Alliant Energy customers are now receiving clean power from Wisconsin’s largest solar facility. The 2.3-megawatt Rock River solar project recently went into service near Beloit, Wisconsin. The sun-powered generating station includes over 7,700 solar panels, covers nearly 17 acres and produces enough electricity to power 500 homes.

“Investments in clean energy have been central to our plan for decades,” said Patricia Kampling, Alliant Energy Chairman, President and CEO. “Solar is an important part of our future energy mix and one of many ways we are following a path of sustainability and stewardship.”

The Rock River solar project is located on Alliant Energy’s property in the Town of Beloit, and it is sited on a landfill, a further environmental benefit. The company collaborated with the Wisconsin Department of Natural Resources to enable the landfill site to be reused for the solar facility.

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