You can reduce your energy expenditures simply by developing energy saving habits.
Showers usually require less hot water than baths.
Additional savings can be realized by installing simple water-saving shower heads. This will reduce water consumption, which is good for everyone. The primary benefit to you, however, will be lower heating bills brought about by using less energy to heat less water. Use heat-generating appliances such as washers, dryers or ovens during the cooler hours of the morning or evening. This will reduce the load on your air conditioner in the summer, and will actually help heat the house in the winter.