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First Solar to Target Japan Rooftops With TetraSun Purchase

First Solar Inc., the solar manufacturer that gets almost two-thirds of sales from building and selling utility-scale power plants, agreed to buy TetraSun, a startup developing photovoltaic technology for rooftops.

TetraSun’s solar panels are more efficient than First Solar’s thin-film products and better suited for small rooftop systems, Chief Executive Officer Jim Hughes said at an analyst meeting yesterday. He plans to initially market TetraSun products in Japan, which last year introduced an incentive program to encourage supplies of solar energy.