Get a water heater that uses less electricity. Some water heater labels will specify how much less energy they consume. A tankless heater, which only heats water as needed, saves more energy than a traditional tank heater.
Repair toilet, faucet, and dishwasher leaks to save gallons every day.
Use your dishwasher instead of hand-washing your dishes to save gallons each load. Reduce your shower time by one or two minutes to save gallons each minute.