Modi’s government wants to attract $100 billion of investment in clean energy over the next five years. Companies and lenders say that will require a shift in policy from India’s current auction-based system, which caps installations to control the scale of solar fitted and the amount of subsidy payments incurred.

“Bidding is now counter-productive,” Vineet Mittal, managing director of Welspun Energy Ltd., India’s biggest photovoltaic developer, said in an Oct. 10 interview in New Delhi. With global panel prices stabilizing after a three-year decline, auctions risk encouraging over-aggressive bidding that could lead to unviable projects, he said.

India led the world in competitive bidding — followed by Brazil and South Africa — which helped push down the cost of solar power by about half since 2010. In recent months, government officials and developers including Goldman Sachs Inc.-backed ReNew Power Ventures Pvt. have begun calling for a transition to feed-in tariffs. That system sets a uniform price and invites any generator willing to supply at that rate to install as much as they want.

The government is considering whether to grant fixed solar tariffs instead of holding competitive auctions, Tarun Kapoor, joint secretary at the Ministry of New and Renewable Energy, said in August. As the price of solar converges with the cost of conventional power, state distribution utilities would be “more comfortable” with such a shift, he said.

Recent coal power projects in India price their electricity at about 5.5 rupees a kilowatt-hour. In comparison, the most recent national solar auction priced photovoltaic power at about 6.5 rupees a kilowatt-hour, according to data compiled by Bloomberg.

Germany has installed 35 gigawatts of solar, compared with India’s 2.7 gigawatts, according to data compiled by Bloomberg.

Copyright 2014 Bloomberg

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