He says Germany should set a 2.8GW cap on annual installations to limit the cost.
Massive demand, but fears over tariff costs
Last year, Germany installed 3.8 gigawatts (GW) of solar capacity, and while estimates for this year vary - between 3.5GW and 7GW -the country will maintain its position as the world's largest market for solar-photovoltaic (PV) power.
4 June 2010 10:36 GMT
Updated
8 January 2013 10:36 GMT
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