Graeme Bathurst, of independent energy consultancy TNEI, suggests 7p/kWh as a reasonable estimate(http://news.bbc.co.uk/2/hi/uk_news/magazine/4900188.stm)
This information is available on electric bills in the US and depends on how the utility company structures charges and may also depend on who is using the power and when.
It's different in different areas & at different times.
There is no such thing as a kilowatt per hour. You are probably thinking of a kilowatt hour (kW.h) -which is a unit of measurement for...