Associated Press: The largest solar power plant of its type in the world -- once promoted as a turning point in green energy -- isn't producing as much energy as planned.
One of the reasons is as basic as it gets: The sun isn't shining as much as expected.
Sprawling across roughly 5 square miles of federal desert near the California-Nevada border, the Ivanpah Solar Electric Generating System opened in February, with operators saying it would produce enough electricity to power a city of 140,000 homes.
So...