Jamstigator's first sentence raises an excellent point. In a recent local news story, a man's 'grow house' was caught and shut down because his neighbors took notice of his frequent, oddly-timed visits to an obviously vacant dwelling. If your neighborhood is too nosy for timed lights to tricks the locals into thinking you live there, I suggest that you arrive each time with a tool box or an odd piece of lumber so you appear to be remodeling the place for resale. I also recommend that you engineer your grow so you don't have to show up at 3AM or multiple times per day.

In your situation, I'd fear a granny with binoculars far more than the power company.
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