The state Washington is located in the Pacific Northwestern region of the country. Let us find the feasibility of the residential solar in the state. My solar power system will be feasible if it offers more than or equal to 2.9% (20 years bond yield) return per year otherwise it is not feasible.
38.9° North 77° West
The state receives the average solar radiations of 4.57 KW-hr/m²/day
System cost and electricity rate
Let's see the financial feasibility in the state
The main reasons for the non feasibility of the residential solar power system before tax credit with respect to the grid electricity in the state are the low cost of the grid electricity and relatively less solar radiations with respect to the other states in the country. But this doesn't mean that it will not be feasible in near future. Any further escalation electricity prices, reduction in the solar prices or any development in the solar technology, improving it's efficiency will make the system effective, efficient and feasible before the tax credit by the government.