Our Nations Capital, Washington DC, covering only 68 square miles in area and with a population just 700,000 is pretty densely built out. Not a lot of ground space for solar, but that doesn’t mean the district doesn’t have solar potential for homeowners or businesses. In December 2018 the City Council approved a bill requiring DC to get all of its power from renewable energy by 2032. Ambitious to say the least.
Our sample assumes a 10 KW solar PV installation and installed cost of $3.00 per watt. This keeps the math simple and allows you to estimate your own needs for your own property based upon electric bills.
Washington DC gets on average 4.9 sun hours per day. Using a 10 KW solar PV system one could expect to produce about 13,766 kWh annually, or 1,147 kWh per month which is slightly above the average home usage of 804 kWh for metro area. Estimated Annual Savings would be $1,511. At a $30,000 total cost to install your simple payback is in 19 years.
The above payback calculations do not take in to account any incentives, State or Federal. If you want to run your own analysis for your home town feel free to check out how we calculate solar power using PV Watts Database. If you want to learn more about various incentives, all the information you need can be found through the DSIRE database.