Ann’s earlier post regarding the accelerating drop in costs in 2009 and 2010 for installed photovoltaic solar energy systems general jibes with the estimates by Emanual Sachs, of 1366 Technologies/MIT. Sachs predicts that “manufacturing innovations in silicon PV will decrease costs by 10% per year through 2020, at which point solar electricity becomes cheaper than coal” (Sachs’ Law).

1366 received a $4 million ARPA-E grant last December and the company recently announced that it had raised another $20 million from investors. It also recently hosted DOE Secretary Chu at its facilities in Massachusetts:

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