I applaud you for considering a change. However, you’re talking about making two career pivots at once, and I would suggest doing one at a time - i.e. either keep coding in clean energy, or do something other than coding, but not both. It’s hard to pivot.

If you want to be a senior SWE in clean energy, the Climatebase rec is good, or https://www.terra.do/, or subscribe to a newsletter like https://www.ctvc.co/tag/newsletter/ that announces when climate tech companies raise money (at the bottom of each newsletter), and apply to open roles at those companies when they start looking to spend their new money, usually ~1-3 months later.