After loading into my game today, I hadn't played for about 1 week, none of my workers would use my manual power generators. The generators were set at priority 5,6, and 7 with corresponding power thresholds at 75, 60, 50. They were wired to a Power Transformer that then attached to batteries. Batteries which were empty, this setup worked the last time I was playing, so I'm confused at why it doesn't work anymore. This may be user error, but it seems like a bug.