A survey conducted by Climate Policy Initiative (CPI) and Indian School of Business (ISB) said renewable energy requires policy support as unsubsidised energy is 52-129 per cent more expensive than conventional power.
As per the current policy, the government provides support through a combination of state-level feed-in tariffs and federal subsidies in the form of a generation based incentive, viability gap funding, and accelerated depreciation.
CPI-ISB noted that if cost-effectiveness was the only criterion of interest, a class of debt-related federal policies that provide low-cost, long-term debt are more cost- effective.
"Our main finding is that, in the long-term, debt- related policies are more cost-effective than the existing ones. In particular, the combination of reduced cost, extended-tenor debt is the most cost-effective policy," it said.
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With a tenor extension of 10 years, for wind energy, a 5.9 per cent loan could reduce the total the sum of the central, state and tax subsidies by 78 per cent compared to the most cost-effective version of the generation based incentive of Rs 2.03 per unit.
Furthermore, this policy combination would allow for a high degree of subsidy-recovery of 76 per cent for wind and 49 per cent for solar.
The report however noted that though reduced-cost, extended-tenor debt is clearly attractive from a long-term perspective, in the near-term, the government may have insufficient funds to provide support solely through this policy.
"The government needs to design policies in a way to incentivise power producers along with production and take a comprehensive, long-term measure of capital efficiency to achieve renewable energy goals in the most efficient way possible," the report said.