For Instance, you may plan to buy the solar system and pay back the expense in installments within a interval. In Washington, the payback time period is all over 7 – 9 years. Neighborhood Rebates and Incentives: Some community utilities and municipalities present extra rebates and incentives for solar installations. https://www.mediafire.com/file/ce3mx6mfxrudtgz/How_Solar_Panel_Installation_in_WA_Can_Reduce_Your_Electricity_Bills/file