Solar Thermal Electricity: Can it Replace Coal, Gas, and Oil?

One of the most common arguments against large-scale use of renewable energy is that it cannot produce a steady, reliable stream of energy, day and night. Ausra Inc. does not agree. They believe that solar thermal technology can supply over 90% of grid power, while reducing carbon emissions. More here, http://cleantechnica.com/2008/03/27/solar-thermal-electricity-can-it-replace-coal-gas-and-oil/