You don't need power in the storage spot for that. Just take out your battery (which you should anyway), take it home and hook it up to your Battery Tender in your basement, making sure that the battery is off the floor.
That would be best, and if it has a newer sealed maintenance-free battery, it doesn't need to be off the ground, as they don't discharge into the ground like the old style ones. It does need to be hooked up to a battery tender or Optimate though. Don't use a "smart" charger from Canadian Tire though. They drop the volts once they hit full charge, but they don't lower the amps, which can still damage your motorcycle battery. Also under 1 amp is optimal for maintaining the battery during storage. Unless you have a lead hooked to your battery, and you want to keep the battery in the bike, take it out as suggested.
In terms of storage in the west end, my choice would be (and I am going to store one of my bikes with them next week) is Parker Bros. on Kipling. I have dealt with them for a number of years, and they are the most knowledgeable shop I know of in the GTA. They are a KTM dealer, and the guys there all ride street and offroad, and I think most of them race too. They have a few packages, and their basic package is $249 plus HST for winterizing the bike, maintaining the battery, and storage until Apr. 1st. There is a package up from that which includes oil and filter change, and I think it's $349? The reason I am storing a bike with them, is that they don't rent out an old barn or something and throw their bikes in there for the winter, like a lot of places do. They have a heated, video monitored and alarmed storage place, and they will store it until April. Another place in the west end is Rider's Choice. I think it's $250 plus HST for their package, and they store it until March 1. Wildside is also storing bikes too. I don't know any details about price though. That's all I can think of in the west end, best of luck.