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India's NTPC warns of reduced coal load causing a reduction in the lifespan of coal plants

NTPC Ltd., India's biggest coal power generator has expressed concern that running coal-fired plants at a lower load could shorten their lifespan.

The Central Electricity Authority, the de facto advisor to the Power Ministry in the country, has recommended that the technical minimum - the lowest level of reliability for a thermal power plant - be lowered to 40% to accommodate the growing production of renewable energy.

CEA intends to implement it from next year.

This is part of India’s strategy to increase solar and wind energy in the grid, while maintaining a round-the clock supply.

Ravindra Kumar, NTPC Director of Operations, said that operating at low levels for a long time could cause rapid wear, particularly in turbines and boilers designed to handle higher loads.

On Tuesday, Kumar told the Powergen India event that if we continue to operate at this level for a long time, the life expectancy of a plant could be reduced by up to a third.

NTPC chose to set its technical minimum at 55 percent, which Kumar claimed offered a better balance between asset durability and flexibility.

CEA Chairman Ghanshyamprasad responded to these concerns by saying that certain upgrades could make it possible to operate at 40%.

If retrofitting investments are made, machines will run at lower load. It will have an impact on efficiency and compensation mechanisms must be considered," Prasad stated.

India aims to increase its non-fossil energy capacity to 500 GW in 2030. However, coal is still a key component of its energy security.

To ensure reliable supply when renewables are low, the government is planning to increase coal-based power by 97 GW between now and 2035. Reporting by Sethuraman N R Editing by Bernadette B Baum

(source: Reuters)