SunDay is a global day of action on September 21st, 2025, celebrating the unstoppable rise of clean energy. We’ll come together to showcase the power of the sun and electrification, the energy sources that can power our world without pollution. Come see an Old Post Office's historic renovation, total building electrification, energy efficiency and resiliency improvements: Heat Pump water heaters, High Efficiency ACs, Tesla Powerwalls, and EV charging. We'll show the SunDay documentary down in our Speakeasy bar - The Mailroom, adult and kid beverages will be available for purchase.