
"There's lots of electricity around. Surely this is one kind of energy that I don't have to worry about saving."
This is an all too common view. Turning out lights that aren't in use is definitely an important energy saving. You save electricity and in many cases you also save the coal, oil or natural gas used at the generating station. Even hydro sites are now limited. Developing future nuclear and hydro facilities will be very expensive.
So, yes, turn out those lights,