Airport Power

I need a trickle of electrical power about a dozen times a year in my
hangar. I need it for my 125 watt preheater if I'm taking an early-morning
flight in the winter, and will use it for a .25A trickle charger if I've let
the aircraft sit for more than a week or two.

The problem is that my T-hangar doesn't have power. One of the other hangar
renters had electrical service pulled to his hangar, and sublets 15A
breakers for $15/month = $180/year, which is a bit much for me, considering
my needs are for a dollar or so of electricity a year.

Any suggestions other than either buying a small generator or paying the
$15/month?

I'm asking because the "power guy" complained last week when I ran a
dropcord to a neighboring hangar for an hour last week to run the trickle
charger...

KB