Barr staff to present at solar conference June 14, 2020 Andy Polzin and Rachel Walker will present at the upcoming virtual Midwest Solar Expo, which runs from June 15 to June 17. Andy and Rachel will discuss “Developing Solar Projects on MN Closed Landfills and Lessons for Other Brownfields Development” on June 16 at 1:10 p.m. CDT. You can register here. The Midwest Solar Expo is an annual educational and networking conference that focuses on the Midwest’s solar industry. You can find more information on their website.