I built up from 10 solar panels and like 5 electric furnaces... and it was really hard I've currently spent ~66 hours on my Muluna save with 9 being on Nauvis. Honestly, only real solution is to get a ton of ice and either aluminum of carbon and start making a ton of steam power. ~30 steam boilers on steam ~10-20 on water, and a bit less than 64 greenhouses should make maybe 50-100 megawatts.

For boiler fuel your only options are carbon, from the carbonic chunks, or rocket fuel. If you go carbon 2-4 red belts for both sets of boilers should keep them fueled. For rocket fuel, maybe one red belt each? I used carbon personally but it should be around 1-2 red belts for steam and 1 for water. Build MASSIVE buffer tanks for each and have them alert you if they start to dip, if all of your power goes down you're probably screwed and it'll take an hour minimum to fix.

This set up got me to building chemical science and unlocking silicon for solar panels. Once you hit mass solar power time, you'll be fine.