all i know is with 2 x 600 watt hps lights thats 1200 watts alltogether i use between 10-15 units a day inc everything else my electric bill is high about £100 a month maybe a lil bit less
they did quesion the amount i was using but i jus said i got a big ass tv an always washin an loadsa shit
they didnt seem to really care
i know if your doing a big grow in the uk say like 200-1000 plants on a commercial scale, wot they do is run the electric on a meter so they buy cards to run it but they have to rewire the meter to bypass the electric company as the meters send data to the company about how much electric they use
believe it or not most peoples large grows get busted due to the electric company knowing or finding out the meters bypassed an then reporting this to the police as its illegal.
the other way which is more common is that people end up setting fire to the grow room or meter as the rewireing wasnt done correctly, so when the fire an police show its pretty obvious wots happened