I pay about 9 cent KW/hr, not sure about capacity... I have room left in my circuit breaker if thats what you mean. How do I find out about capacity?
I'm not looking for a big miner, as I understand they are usually very loud. My wife, doesn't want to deal with something that sounds like a shop vac constantly going off in the garage, especially as we have an 18 month old that takes naps during the day still.

I have bought some bitcoin already, and plan to buy some more, but the mining thing seems like a fun hobby to play around with a bit. My understanding is the USB miners are quiet but don't produce much sats. Do you have an idea how many I can expect to mine on a monthly basis with one?