Yep. They really don't want to buy your excess electricity. They have as much as their lines can hold (lol) If you produce your own and they don't sell you any, there is no profit. Without profit they cannot pay their overhead and infrastructure. Just like all the electric cars not requiring gas and in turn don't pay any road use tax. Who pays for the highway construction and maintenance then? The only thing you can do to prevent what just happened to you is to go completely self powered and disconnect yourself from the grid. Catch my drift?