"Complex geology" under the unlined pits led to groundwater seepage, and evidence showed the Cumberland River was contaminated by the heavy metals.

Falling prices from deregulation are good for consumers, but competitive electricity markets have also dramatically increased the number and type of products consumers can choose from, the authors write.

A state judge finalized the settlement over the failed nuclear plant this week, which totals $2.2 billion in customer rate reductions and refunds.

The bill passed the state Senate Wednesday and is intended to prevent turbine interference with military flight paths. But military leaders say the legislation is unnecessary.

The companies' announcements are part of a growing trend of corporate renwable energy commitments.