"The water scarcity crippling large parts of India has already cost coal power companies nearly 7 billion units in lost electricity generation, with an estimated revenue loss of Rs 2,400 crore in the first five months of 2016 alone, the NGO said.
Greenpeace India had on Friday said that the amount of fresh water being consumed by the country's coal-fired power plants can meet the basic water needs of about 25 crore people and had also accused the government of having "myopic" view on managing India's water resource.
"We already know that the expansion of coal power will increase air pollution and deforestation; this data shows us that it will also worsen the water crisis, posing a serious financial risk to lenders and investors in these projects," said Ravi Chellam, Executive Director of Greenpeace India in Mumbai.
The analysis is based on daily outage reports from the Central Electricity Authority (CEA) and RTI replies from National Thermal Power Corporation (NTPC).
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Most of the losses have occurred between March and May, when plants have been unable to run due to a lack of water for cooling, the NGO said.
"For financiers looking to invest in the building of these coal power plants, particularly in those areas that habitually experience water stress, the water crisis should set alarm bells ringing.
Greenpeace India said that repeated shutdowns at NTPC's
Shutdowns at Adani's Tiroda power plant in Maharashtra in May have cost the company 570 million units of electricity, with a value of nearly Rs 200 crore. For most of the month of May, over 4 GW of coal power was shut down due to unavailability of water, it said.
The analysis includes case studies of two regions where water scarcity poses a financial risk to new coal plants - Solapur in Maharashtra and the Krishna Basin in Karnataka.
The NGO said that the Environment Ministry has given final Environmental Clearance to 17GW of coal power plants and first stage Terms of Reference (TOR) to another 33 GW of new coal plants.
The CEA's April quarterly report shows 72GW of thermal power projects are under construction and India's energy projections made in advance of the Paris climate summit in December 2015 indicate another 300 GW of thermal power proposed by 2030.