Have you been a silly boy, token?
This is the best advice anyone will ever give you:
Tell no-one.
For your electric bill, think of it like this. If you had a family, with kids your electric bill would go through the roof. Washing machine on all day, tv, computers, tumble dryer, dishwasher... it all mounts up. They don't know anything about you. For all they know you could have a recording studio in there, hold parties everyday.
One 400w light costs me 75p a day to run (24hrs), so the flowering lights come in at half that. So long as you pay your bill they don't give a fuck what you're using the electric for. The only time they get bothered is when they find out you been stealing it. Then they tell the police.
The ONLY way you'll get caught is from stealing electric or telling too many people that actually know who you are.
Also, let me tell you something about the police, they are undermanned. They haven't got the time to actually investigate anything. They only really solve crimes that don't need any investigation, because there are plenty of them. Plenty of paperwork. The feds simply haven't got the time to go around investigating things. Especially little things.
Common Sense should be the order of the day, if you lack this then you should give up now.