Dont wana piss on anyone's parade , just wanting to chip in my advice before I leave you to it however anyone reading this and is thinking about it , really just dont do it , its not worth it.
First off , if the power goes missing the company is gonna start to ask some questions , which will only draw attention. I'd even maybe argue within reason as long as the bills paid the power company dont give a fuk what you use, more a police thing even if that, as its money in there pocket. If I owned a power company , id market myself out there to growers , growers are a power company's best friend, were like crack heads to crack dealers , they just look at us and see $$, after all there a business , bussiness's have quotas etc and are run for profit , so long as you dont take the piss , I would imagine your fine.
Not to mention if worst comes to worse, you will get done for stealing power on top of everything else , maybe even some extra if they think the way you did it was extra dangerous.
Personally I'd rather tun the risk of selling an oz or two to pay the leccy bill then steal the power, esp for peace of mind, all just hypothetical ofc.
Not saying you cant do it and get away with it , however its one of those silly things(usually get you caught, up there with pissed off ex's) I would not want looming over my head , the possibility that something could happen down to me being silly and doing something like stealing power , would be like an ultimate boot in the balls to loose everything due to me wanting to cheap out a little.