Netmetering?

Net metering is a billing arrangement that allows solar system owners to receive credits for the excess electricity they generate and send back to the grid. When your solar panels produce more electricity than you need, the surplus is automatically fed back into the grid. The utility company then credits you for the excess energy, which can offset or reduce your future electricity bills.

Systems up to 25 kW: monthly net excess generation credited at a rate equal to 75% of retail rate Systems larger than 25 kW and up to 1 MW: Monthly netting at the retail rate. Any credits that exceed the customer's monthly bill will be carried over to the next billing period indefinitely.