The CoD is a pre-requisite for selling power at the rate prescribed in the power purchase agreement.
The NSEFI has claimed that the power produced from these solar projects is being sold at concessional rates.
"NTPC and its trading arm NVVN are delaying in providing CoD certificates to plants commissioned in March, 2017, even after three months of their commissioning, although contractually required to provide CoD from 30th day of commissioning," NSEFI said in a letter to power secretary.
The Ministry of New & Renewable Energy in March 2015 under the National Solar Mission programme came up with a scheme for setting up of 3000 MW (Phase II, Batch II) of Solar power projects under state specific bundling scheme to be implemented through NTPC/NVVN.
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Around 1500 MW of solar power projects have been commissioned in the last three months out of entire 3000 MW awarded under the scheme.
However, the NSEFI said that all these projects are facing significant delays in achieving commercial operation for reasons beyond their control.
This also includes 950 MW projects in Gani-Sakunala Solar Park in Andhra Pradesh.
It also said that the NVVN has been citing the delay in approval for allocation of thermal power as a reason for delay in granting CoD approval for these projects.
"Solar power developers are facing significant financial losses, as power is being forcefully billed at concessional rate instead of PPA rate. Developers are left with no option but to get arm-twisted by the NTPC," the NSEFI has said in the letter to the Power Ministry.