Pool pumps can use a significant amount of energy. For example, a one horsepower pump running for 12 hours at 10 cents per kWh costs about $1. This equates to almost $30 per month. For energy savings, run pool pumps the minimum number of hours needed to keep the pool clean. Time clocks make it possible to limit the number of hours the pump operates and control which hours it is on.
Some electric utilities have programs that reward customers for restricting their pool pump's operation to off-peak periods, usually at night. Check with your utility to see if there is a program and if you quality for it.