Washington State House Bill 1859, signed to law in 2001, provides a sales tax moratorium on qualifying purchases of equipment used to build renewable energy systems through 2011.
In 2006 an amendment to the bill included solar hot water systems in the listing of qualifying equipment.
The bill, along with several other key pieces of renewable energy legislation receives credit for the 57 percent increase in the amount of green power sales between 2004 and 2005. The bill is also a key component, along with SB 5101 and SB 5111, in making Washington State a leader in renewable energy and solar power production.
The sales tax incentive, combined with energy credits for solar power produced are designed to create incentives for individual and corporate investment in the production of renewable energy and stimulate demand for the production of solar collectors and other products produced within the state of Washington.