I'm sorry for digging up an old thread, but I found out how to fix this after struggling with it for awhile, and as this thread is the #1 Google result for this problem, I thought I'd add the fix onto it on to here for any future people who are looking for help.
Even though it's out of date, installing the Background Processing mod works, and will let your electricity producing parts work like they should to keep you from running out during fast time warp.