One of Enron's many schemes involved creating a logical abstraction layer across physically partioned grids. I think the lesson learned from that scandal is to

One of Enron's many schemes involved creating a logical abstraction layer across physically partioned grids. I think the lesson learned from that scandal is to keep it simple. On a per grid basis, simply acknowledge that fossil fuel accounts for X% of power, and rally the community behind an honest metric. Headlines claiming 100% "mission accomplished" will lull most people into a false perception.