Ahmed Buhari is the son of B S Abdur Rahman, the vice-chairman of the ETA Star Group, which has a presence in real estate and trading in the UAE. In January 2017, raids were carried out in 74 places across the country which were connected to Buhari group and ETA Star group of companies. These included 49 locations in Chennai, two premises of Coastal Energen Pvt Ltd, the power generating flagship firm of the Coal and Oil Group, and several other places, as the tax department suspected large-scale evasion by the groups.
Coastal Energen operates on imported coal procured from open market sources. The 558-Mw power generated from Unit-1 of the project has tied with Tamil Nadu-owned discom Tangedco at a levelised tariff of Rs 4.69/kwh for 15 years ending September 30, 2028. The project's second unit doesn't have a long-term power purchase agreement (PPA).