There's a few alternative ways to go about it. If you have heating towers from gleba, you can burn some excess solid fuel (and melted ice) from scrap to make steam. Might be short on ice but could drop some from orbit (if your asteroid processing tech is good enough?). Or cart in nuclear stuff from nauvis. If you've started on higher quality stuff you could probably recycle extra batteries and make higher quality accumulators (a little more space efficient...but if you're still power constrained you probably wouldn't be removing the old low quality ones...).