Nine Challenges of Alternative Energy

In his just-released report, "Nine Challenges of Alternative Energy" Lawrence Berkeley staff scientist David Fridley assesses the obvious yet too often overlooked obstacles to the widespread deployment of alternative energies around the world. The report can be downloaded here. According to Fridley, these nine challenges are:

Scalability and Timing

Commercialization

Substitutability

Material Requirements

Intermittency

Energy Density

Water

The Law of Receding Horizons

Energy Returned on Energy Invested