Please add electric boilers. This might seem counter-intuitive to produce steam from electicity, but it can be used in conjunction with tanks to build steam based accumulators, which should be able to store and discharge much more energy than standard battery based accumulators.

Angels' petrochem adds electric boilers, so you might be able to look at that for inspiration, or just rip it out, license permitting. It's non-derivative creative commons, so cloning that section might not be an option. I don't understand enough modding to do it myself