A crippling shortage across the country has pushed state-run Coal India to impose temporary supply curbs to non-power consumers, including the energy-intensive aluminium industry, pushing producers to draw electricity from the grid.
Indian aluminium producers such as Hindalco Industries Ltd and Vedanta Ltd largely use power generated from the so-called captive utilities - which are not connected to the national grid - where the companies generate electricity for self-use.
AAI estimates aluminium production to annually account for 5-6 percent of India's total power demand met through the national grid.
"Since we are going to the (national) grid, that increases power demand in the country and puts further pressure on coal plants which already have low fuel," AAI said in a statement.
Electricity use in India's eastern Odisha state, which accounts for over half of India's aluminium smelting capacity, rose 25 percent during the first half of October, government data showed, growing over five times faster than national average.
Aluminium producers says fuel procurement challenges were being exacerbated by Coal India's decision last week to cancel auctions and curtail supplies under long-term contracts.
"Under long-term fuel supply agreements, we were getting full supplies in June, in September that reduced to 60 percent and in October we are getting as low as 50 percent," AAI said.
Long-term fuel supply agreements with Coal India have historically accounted for a majority of domestic supplies to the industry, with auctions conducted by the miner accounting for the rest.
However, Coal India denying extension to five-year agreements with non-power consumers which ended this year, and some aluminium companies cancelling long-term agreements last year have increased dependence on auctions, AAI said.
The AAI said some companies cancelled long-term contracts as coal was available for lower prices last year when coronavirus cases were high.
"We are desperate for coal. Sustaining operations will now depend on how Coal India reacts in the next ten days," AAI said.