While the Andhra Pradesh is already facing an unprecedented power crisis, the Centre has reportedly cut the supply of gas to the thermal plants in the state.    The cut, according to sources in the power sector, came into force on August 1. With this, the power generation has come down drastically by about 15 per cent. Apparently, the Union Petroleum Ministry has cut the gas supply to the tune of about 2 mmscmd (Million standard cubic metre per day) and that the gas has been diverted to Dabhol power plant in Maharashtra.    According to the sources, the gas was diverted to Dabhol as per a recommendation of the empowered group appointed in 2008. The group recommended that the Dabhol plant should be supplied gas on a par with fertiliser plants. In the priority list of gas supply, fertiliser plants occupy the top slot.    Even though nobody bothered about the decision for four years, the new Union Home Minister Sushil Kumar Shinde before leaving the Power Ministry two days ago is said to have asked Petroleum Minister S Jaipal Reddy to implement the recommendation of the empowered group.