Sun Day 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 wind, the energy sources that can power our world without pollution.

This Sun Day, join Climate Action Now for a virtual Climate Action Party!

We'll kick off with a special pre-recorded greeting from Bill McKibben, the driving force behind Sun Day! Then, you'll get a global update on solar’s amazing progress from Sam Matey-Coste, Editor-in-Chief of the Climate Action Now Dose of Climate Hope newsletter. Next, we’ll delve into solutions to expand local and state solar deployment in the U.S.: You’ll learn about ultra-simple plug-in solar panels with Bright Saver, streamlined rooftop permitting with Third Act, and expanding solar access for homeowners and renters with Solar United Neighbors. We’ll close out this Sun Day Action Party by taking real-time action in the free Climate Action Now app to help more communities plug in to the power of the sun!

Register now for Think Global, Act Local: A Sun Day Climate Action Party on Sunday, September 21, 7–8 PM ET!