DC SRECs (Solar Renewable Energy Certificates)
Ongoing income — the most valuable SREC market in the US
You earn one SREC for every 1,000 kWh your panels generate — roughly 9–10 per year for a typical 8 kW rowhouse system. DC's Renewable Portfolio Standard requires utilities to buy them, and DC SREC prices are the highest in the nation. This is income on top of your bill savings, and it's why DC payback periods beat almost every US market.