We agree to purchase the electricity produced at a solar field in Palmer, Massachusetts, at a cost of 10.25 cents per kilowatt hour. We pay the solar producer each month for the electricity that was produced and sent to National Grid. National Grid allocates credits to our accounts as we specify, at the General Service (G1) rate. If the current G1 rate is 17 cents per kilowatt hour, then we essentially paid 10.25 cents and were credited 17 cents. The difference between the two is our savings.