Yo if your growing say a basement full of plants, which seems is what this guy wants. You can't just pay that massive bill and not go away unnoticed, obviously he's gotta steal power, its so frowned upon, but most of the weed in canada is grown on stolen electricity. yea some people have 30 plants and are payin bills but the majority of indoor weed comes from the commercial growhouses.
OP:
your gonna want to drill a hole through your foundation in the basement wall where the meter is outside your house (i dunno about you southerners without basements though, i guess less drilling involved). Test the wires to find which one is the main line to your house, and then throw a T clamp on it with high gauge wire to divert power to a seperate box in your basement, then you can run your lights/fans/etc off that box. Make sure to wear rubber boots and gloves for all of it especially the drilling so you dont kill yourself.
If you dont know how to undertake any part of that, then dont.. or.. partner up with an electrician in it.