The Washington DC Solar Power Directory features solar power contractors that install photovoltaic solar panels and solar hot water systems for residential and commercial purposes. 64 kW solar panel system to cover the average electric bill in Washington D., which will cost you about $30,509. Some states, towns, and utility companies offer incentives that can help lower the cost of solar. Compare multiple offers and save up to 20% Make this the. Rooftop solar generation is the leading strategy for generating local, clean energy in the densely developed District. These devices, known as solar cells, are then connected to form larger power-generating units. We manufacture top-quality PV modules in our state--of-the-art facility in India and provide PV installation/integration services for residential, commercial and government clients in the Mid-Atlantic region of USA, serving specifically in MD, VA and DC. Our vertical integration gives us the. Solar for All, a program of the District of Columbia's Department of Energy and Environment (DOEE), seeks to provide the benefits of solar electricity to 100,000 low-income households and reduce their energy bills by 50% by 2032 with Solar for All.