No one checks power use. The cops don't have access to that kind of information from any kind of company without a warrant. For example, under the guise (real or not) of fighting terrorism the US government is re-making current laws to make it easier to get internet information from providers. The way the law stood up until now, they could be trying to chase up a terrorist lead, ask a web provider for a users info and they just say "no"- and that's it... so back to power. The cops could ask but the company can legally say "no" or "I don't care". Plus no one, cops or not, is monitoring usage to even know wierd when it turns up
Even if they did search or report? How can they tell it's a grow? You may love Air con or heaters or plasma tv's- etc. 2 mums can be done for not much juice so as it is, your neighbor might be legally burning more power than you on something else anyway.