FWIW, https://indowwindows.com/ (San Francisco) make window inserts that are the exact same size as the existing window, plus a wooden frame, so they look exactly like the existing windows. Mostly for keeping the exterior look of buildings in SF due to regulations, they block out sound and help with temperature control. They're pricey tho.
As for solar. If you have the budget and the disaster preparedness for it, there are some camping grade solar + battery systems that aren't house-grade, but great for power outages. The systems range from small (affordable), to the 1000 Plus, consisting of a battery with 1264Wh capacity and 120 v inverter, along with 200W of solar panels. That one'll run. you $1,500.
Do you have an Indow? I’ve been eyeballing them for a while, but they’re pricy enough I haven’t been willing to call the shot yet.
I do have a pretty big bluetti and a couple panels for it - I also grabbed an RV fridge for storing food. Naturally, the capitalist gods smiled upon my financial offering and have blessed me with steady power since then.
As for solar. If you have the budget and the disaster preparedness for it, there are some camping grade solar + battery systems that aren't house-grade, but great for power outages. The systems range from small (affordable), to the 1000 Plus, consisting of a battery with 1264Wh capacity and 120 v inverter, along with 200W of solar panels. That one'll run. you $1,500.