Solar Energy: The Quest for Cheap

The big number is 50. When companies can produce solar photovoltaic modules for less than 50¢ per watt, solar energy will be able to compete directly with coal. Right now, the cheapest solar cells are being produced for as little as 70¢ per watt. They are selling for about $1.26 per watt, with prices expected to drop to $1.17 next year. Most anticipate they they will hit 50¢ per watt within four or five years.

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