The following links are to various sites that discuss the alternative of space solar power (SSP) or solar power satellites (SPS). The concept is to collect solar energy in space and beam it to points on Earth and perhaps to other receivers in space.
Space Solar Power — National Space Society.
The Moon as a Solar Power Satellite — Space Future Journal.
Solar Power Satellite — Wikipedia.
Space Studies Institute — Organization that promotes the Gerard K. O'Neill concept.
Solar Power Satellites: An Idea Whose Time Has Come, by Seth Potter — Research Scientist, New York University.
Reinventing the Solar Power Satellite, by Geoffrey A. Landis — National Aeronautics and Space Administration.
Japan Plans To Launch Solar Power Station In Space By 2040, by Takahiro Fukada — Space Daily.
What is SPS? — Kyoto University Space Group.
Space Based Solar Power Lights Up Japan's Energy Future, by Steve Levenstein, February 12th, 2008 — Report on program of JAXA, Japan's space agency.
A Fresh Look at Space Solar Power: New Architectures, Concepts, and Technologies, by John C. Mankins — Space Future Journal.
Conceptual Study of A Solar Power Satellite, SPS 2000, by Makoto Nagatomo, Susumu Sasaki, Yoshihiro Naruo — Space Future Journal.
URSI White Paper on Solar Power Satellite (SPS) Systems, URSI (International Union of Radio Science).
Analyzing Microwave Power Transmission & Solar Power Satellite Systems, by Aruvian Research, April 2008 — Report from Research and Markets journal.
Solar Power Satellite Report: "No Showstoppers", by Frederick Osborn, Jr. — L5 News, February 1981.
Japan May Beat US To Solar Power, by KD Martin, June 18, 2008 — Live Science.
Space solar power: opposition and obstacles, by Taylor Dinerman, June 4, 2007 — The Space Review.
Testimony of Ralph Nansen before House Science Committee Hearings on Solar Power Satellites, Statement of Ralph H. Nansen, President, Solar Space Industries, September 7, 2000.
Sun Power: The Global Solution for the Coming Energy Crisis, by Ralph Nansen, 1995 — National Space Society.
Solar Power From Space — GreenMuze.
PG&E Closes Space-Based Solar Power Purchase Deal — GoodCleanTech.
PG&E makes deal for space solar power — MSNBC.
Space Based Solar Power Satellite Program from PG&E and Solaren in California — CleanTechnica.
Space-Based Solar Power Coming to California in 2016 — PhysOrg.com.
Space colonization — Wikipedia.
Space elevator — Wikipedia.
Liftport space elevator — Liftport Group.
Other alternatives and risks
Resource Depletion — Problems, alternative solutions, and risks.
Nuclear proliferation — Wikipedia.
The Search for Proliferation-Resistant Nuclear Power, by Harold Feiveson — Federation of American Scientists report.
Nuclear Energy - No Solution to Climate Change — Greenpeace background paper.
Carbon Risk, Coal, and Higher Electricity Prices — Union of Concerned Scientists. Why coal-generated electricity will cost more than utilities claim.
Peak Oil — Gateway to topic.
Alternative Fuels: An Energy Technology Perspective , by Dolf Gielen & Fridtjof Unander — International Energy Agency.
Sun catchers tuned to crank out the juice, by R. Colin Johnson, — eeTimes. Only a solution during unclouded daylight hours, as we presently don't have a comparably efficient way to store that much energy. So, a supplement but not a full replacement.
Nocera Process, by Anne Trafton. — Direct hydrogen production from photovoltaics. Appears very promising.
Energy Victory, by Robert Zubrin. — Leading space engineer reviews our energy policy alternatives.