Directs the northwest solar center, a program of Washington State University's energy extension service, to conduct a feasibility assessment of the economic and technical viability of building a large-scale, public-demonstration, solar electric generating facility.

Provides that the assessment should include the facility's economic viability, costs and benefits to Washington state, including job creation and environmental impacts, and its impact on the regional energy. The center's assessment should also include an analysis of the impact of this energy choice as compared to other energy generation options.

Requires the assessment to be completed and a report summarizing the findings prepared and delivered to the energy and fiscal committees of the legislature by December 15, 2006.

Provides that the act shall be null and void if appropriations are not approved.