Alliant Energy’s Iowa Company Reaches Partial Settlement on Pending Rate Review

Alliant Energy’s Iowa energy company has filed a proposed partial settlement agreement in its 2017 electric rate review. This agreement creates cost certainty for customers and allows Alliant Energy to continue to advance cleaner energy, to strengthen the reliability of Iowa’s power grid and provide innovative customer solutions.

“This collaborative process with our customer groups and our company created a fair agreement that supports our objective to provide exceptional service to our customers,said Doug Kopp, President of Alliant Energy’s Iowa utility. “I want to thank the Iowa Office of Consumer Advocate, the Iowa Business Energy Coalition and the Large Energy Group for coming together on this agreement.”

On April 3, 2017, Alliant Energy filed its first rate review in six years. An interim base rate increase went into effect ten days later. This agreement increases base rates less than 2 percent above interim rates. Under this agreement, the total increase from this base rate review would be 8.6 percent. Spread over the last six years, this increase would have equated to less than 1.5 percent annually. The final bill impact for each customer class will be decided as part of the rest of the rate review process.

Through the rest of 2017, customers will also continue to receive bill credits related to tax benefits and refunds on transmission expenses to offset the base rate increases and maintain competitive customer costs. In addition, under this agreement Alliant Energy will give more tax-related bill credits to customers in 2018.

ENERGY RESEARCH CONSORTIUM ANNOUNCES FIVE NEW MEMBERS

The Mid-West Energy Research Consortium has welcomed four new members to the
M-WERC team. SAS Institute, Alliant Energy, Madison Gas and Electric, OSIsoft and Tetra
Tech have all joined. M-WERC also thanked Kohler Company for their renewed support of
our organization. The SAS Institute is the world’s largest privately held software business
and is based out of Cary, North Carolina. They are a founding member of the Smart Cities
Technologies working group.

Alliant Energy Acquires Ownership Interest in Great Western Wind Farm

In June, EDF Renewable Energy announced the signing of the Purchase and Sale Agreement by which Alliant
Energy Corporation will acquire a 50% ownership interest in the 225 megawatt Great Western Wind Project.
Completion of the transaction is subject to regulatory approval and customary conditions precedent.

“EDF RE is a renewable energy leader, and we are proud to establish a partnership with them,” said Alliant Energy Vice President of Business Development Joel Schmidt. “Our 50 percent cash equity ownership interest in this Project aligns with Alliant Energy’s strategy to invest in renewable energy.”

EDF RE remains involved in the project as a 50 percent co-owner and provides management services. EDF Renewable Services provides a portion of the current operations and maintenance services as well as 24/7 remote monitoring from its Operations Control Center.

Located in Woodward and Ellis counties near the base of the Oklahoma panhandle, Great Western Wind is comprised of 30 V117 (unit capacity of 3.3 MW) and 63 V100 (unit capacity of 2.0 MW) wind turbines supplied by Vestas.  The Project achieved commercial operations in December 2016; electricity generated is provided to Google under a long-term Power Purchase Agreement.

Raphael DeClercq, Vice President of Portfolio Strategy for EDF RE, commented, “The sale of equity stakes represents an integral part of EDF Renewable Energy’s business model, allowing us to maintain a balanced ownership
portfolio in order to assist in the funding of new project development. We are pleased to forge a new business relationship with Alliant Energy on this first transaction. We are confident that our expertise as a developer and operator complements Alliant Energy’s renewable energy strategy.”

EDF Renewable Energy is one of the largest renewable energy developers in North America with 9 gigawatts of
wind, solar, storage, biomass and biogas projects developed throughout the U.S., Canada and Mexico.

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.

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