Tata Power operates a 4,000 megawatt plant in the coastal town of Mundra in Gujarat, while Adani Power runs a 4,620 megawatt plant at the same location. Both generating plants are fuelled by coal imported from Indonesia. Essar operates a 1,200 megawatt plant at Salaya in the same state.
The plants haven't been running at full capacity after the court ruled last year that a change in regulations overseas couldn't be a ground for increasing power prices.
Adani's plant ran at 44.3 per cent capacity during the first half of the fiscal year that began April 1, compared with 66 per cent in the same period a year earlier, according to the Central Electricity Authority. Tata Power's Mundra station ran at 67.7 per cent capacity, down from 69.2 per cent in the previous year. Both these companies have coal mining rights in Indonesia, which hedges against the increase in coal prices. Essar, which doesn't have a mine, kept its plant shut during the time, data show.