>BGE pays customer-generators at the Standard-Offer-of Service (SOS) rate. The dollar value of net excess generation shall be equal to the generation or commodity portion of the rate that the eligible customer-generator would have been charged by BGE averaged over the number of months the account was been net negative. For customers served by an electric supplier, the dollar value of the net excess generation shall be, if available, equal to the average generation or the commodity rate the customer would have been charged by the electric supplier of record. BGE will contact the electric supplier and they will provide the rate.

https://www.bge.com/SmartEnergy/MyGreenPowerConnection/Pages/FAQs.aspx

Selling RECs is where you'll make more money from a home solar system though.