Board of Directors

Board President: Eric Udelhofen

Eric is Development Director for OneEnergy Renewables and leads their Madison office, working to shepherd projects from inception through construction. Eric manages prospecting and site identification, landowner outreach, permitting and interconnection processes, and electricity and REC sales for utility-scale solar projects across the Midwest. Eric has led development for 25 solar projects that are now operational ranging from 1-10 Megawatts, including 15 projects in Wisconsin.

Eric has worked in renewable energy since 2007, when he started as a financial analyst for EDP Renewables. While at EDPR, Eric managed financial analysis for a portfolio of wind and solar projects, and was part of the team who led the US portion of the company’s 2008 IPO. He subsequently joined the Project Development team, working on developing grid-scale wind and solar projects across the US. In 2012, Eric joined H&H Solar, a Midwest solar EPC contractor, where he worked on sales, project development and construction management.

Eric received his B.A. in Economics and Environmental Studies from Carleton College in Minnesota. Most every weekend, you’ll find him either tending crops or working on restoration projects on the solar-powered homestead he runs with his wife and family in Southwest Wisconsin. Eric serves as a member investor representative to our board.

Board Vice President: Jon Johnson

Jon has worked for Humana in Madison for over two decades and brings extensive customer service, marketing and sales experience to our cooperative, with a specialty in working with key member demographics.  Jon joined our cooperative in 2022 and lives in Madison. Jon serves as a member investor representative to our board.

Secretary: Samantha Howk

Samantha joined Arch Solar as a Solar Project Facilitator in February 2022, and now is the Lead Solar Project Facilitator for the Residential business unit. Her team is responsible for educating homeowners about solar and energy storage systems and gathering information to set up their projects for success. Before she pivoted into renewable energy, Samantha held a variety of roles that helped her develop her amazing sales skills.

Samantha earned a B.S. in Business Administration and a B.A. in German from The Ohio State University, and is thrilled to live in Madison, Wisconsin with my husband and their 2 cats. When she’s not busy “slinging sunshine” in her day job, you can usually find her soaking up sunshine. She loves spending time outdoors all year round, whether hiking, biking, canoeing, cross-country skiing, or just hanging out with friends and family. Samantha serves as a member investor representative to our board.

Treasurer: Barbara Springer

Barbara is a retired attorney who spent 35 years in executive positions in government, corporate and non-profit organizations. She has served on numerous non-profit boards for organizations focused on diverse arenas such as child welfare, health and the arts.  Raised in rural northern Wisconsin, Barbara comes from a long line of people devoted to preserving Wisconsin’s passion for community and the natural world.  Barbara lives in the Driftless region of Wisconsin on an organic farm. Barb serves as a member investor representative to our board.

Board Member at Large: Larry Marquardt

Larry is a lifelong farmer in the Town of Hallie in Chippewa Falls.  He has served on many boards and committees throughout his lifetime including Town Board Chairman (20 years), County Board (14 years), Chippewa Fire District (20 years).   He is currently serving on the Executive Committee for the 2024 Farm Tech Days in Chippewa County. He believes in renewable energy for the future and that is why he is proud to incorporate solar into his family’s farmland.  His vision as a board member is to be involved in collaborating with others to move renewable energy forward in our communities.  Larry was elected in 2024 as a member investor representative to our board. Hobbies include spending time with wife, Dianne, children and grandchildren, driving his John Deere tractors.

Board Member at Large: Kate Sandretto

Kate joined our Cooperative’s board in 2025.  She became a member in 2024 and has participated in grassroots organizing for various clean energy organizations. She brings broad investment experience in renewable energy to the board, having been inspired by calls to boycott fossil fuel investments. The ability to directly work towards a better future motivates her to keep learning and to stay actively involved in these investments.

Board Member at Large: Josh Stolzenburg

Josh is the founder and CEO of North Wind Renewable Energy Cooperative in Amherst, WI. Northwind specializes in the design and installation of solar, solar + storage, and EV charging for homes, businesses, and local governments in rural central WI. His areas of focus include financial, business development, municipal and commercial solar, and worker ownership. Josh serves as a Member Contractor representative on our board.