From appliances to solar options, having an energy efficient home is great for the environment as well as your wallet. There are several ways to save – manufacturer rebates, your local Dept. of Water and Power free programs and appliance credits, solar systems, insulation, etc.
To find out what options are available to you, check your local Department Water and Power. DWPs tend to have energy efficiency programs that can be quite extensive. State programs tend to be for larger ticket items such as automobiles, solar system installations, etc.
For a quick, broad reference go to https://www.dsireusa.org/.