KANSAS CITY, Missouri — Burns & McDonnell has successfully completed two solar energy projects for Alliant Energy in Iowa: the 150-MW Wever solar project and the 50-MW Creston solar project. Using Canadian Solar 660-watt modules, the two sites will collectively generate enough power to supply about 40,000 homes annually.

“These projects stand as a testament to Alliant Energy’s commitment to sustainability and our dedication to safety and resilience,” says Jami Stone, construction project manager at Burns & McDonnell. “With more than 326,000 hours worked and over 420 craft workers at peak construction, we’ve demonstrated that sustainability is about protecting both people and the planet.”

A significant portion of the workforce came from local unions, reflecting Burns & McDonnell’s focus on supporting the communities in which it operates. The projects also addressed Iowa’s need for skilled tradespeople through apprenticeships and hands-on training.

“We are incredibly grateful to Alliant Energy and the skilled laborers, carpenters and electricians whose dedication, skills and experience made these projects successful,” Stone adds.

Wever Solar Project

The 150-MW Wever solar project, one of Iowa’s largest, spans around 900 acres in Lee County. Situated in a floodplain between the Skunk and Mississippi Rivers, the project required careful planning, including:

Flood mitigation‍

A 500-year flood preparedness system with advanced drain tiles was put in place to protect the site.

Split-site coordination‍

The project was divided into two arrays (90 MW and 60 MW), 4 miles apart, necessitating complex electrical integration.

Future-ready design‍

The substation was designed to accommodate future battery energy storage.

Creston Solar Project: Overcoming Terrain Challenges

The 50-MW Creston solar project faced challenges from uneven terrain and erosion risks near the Platte River. Burns & McDonnell addressed these issues with advanced erosion control methods and precise grading techniques.

Economic and Environmental Benefits

Both projects offer long-term economic and environmental benefits:

Environmental stewardship‍

Native grasses and pollinator-friendly plants were seeded to improve soil quality, reduce erosion, and enhance local water quality.

Community engagement‍

The projects supported local businesses, food banks, and toy drives. Burns & McDonnell raised $30,000 for Boys & Girls Clubs of Central Iowa and organized drives to support nearby communities.

“As we continue to diversify our generation resources, the completion of these projects means more clean, fuel-free energy for our customers,” said Matt Cole, assistant vice president of operations solutions and services at Alliant Energy. “This is just another way we deliver on our purpose to serve customers and build stronger communities.”

Both solar sites will undergo third-party verification via the Institute for Sustainable Infrastructure’s Envision framework, with results expected in early 2025. The previous nine solar sites Burns & McDonnell built for Alliant Energy in Wisconsin received Envision Platinum designation.

A Fully Integrated EPC Approach

Burns & McDonnell acted as the engineer-procure-construct (EPC) contractor for both projects. By using an integrated EPC approach, the team optimized schedules, reduced costs, and maintained a strong focus on safety. The company’s environmental specialists ensured compliance with all regulations throughout the project.

“From innovative engineering to self-perform construction, these projects highlight the value of an integrated EPC approach,” says Chad Cotter, vice president of solar at Burns & McDonnell. “We’re proud to have partnered with Alliant Energy to set a new benchmark for clean energy projects in Iowa.”

About Burns & McDonnell

Burns & McDonnell designs and builds critical infrastructure from over 75 offices worldwide. The company, founded in 1898, is 100% employee-owned and brings together engineers, construction professionals, architects, planners, technologists, and scientists to deliver projects focused on safety and making a difference. Learn more at Burns & McDonnell.