Baramulti owns Antang Gunung Meratus and together the two own about 1 billion tonnes of coal resources in South and East Kalimantan.

The Indian power generator earlier signed a long-term coal supply agreement with AGM.

Tata Power managing director Anil Sardana said fuel security was key to support Tata’s growth agenda.

“Thus, besides entering into the coal offtake agreement, we have acquired a 26% stake in this coal mine too as its reserves and outlook is very promising,” he said.

“This acquisition would aim to support our power generation projects in select geographies to be developed over the next few years.”

Tata Power’s existing Indonesian presence includes 30% equity stake in Kaltim Prima Coal and Arutmin Indonesia.

As part of the purchase Tata Power has signed an offtake agreement entitling it to buy about 10 million tonnes of coal per annum.

A consortium comprising Tata Power, Origin Energy and Supraco is developing a geothermal project in Indonesia with about 240 megawatts generating capacity.