sentences:  During the 1990s, Piyasvasti played a key role in deregulating and privatizing a number of energy-related state enterprises like PTT and power generation business.During his term as energy minister he implemented wide-ranging reforms in the energy sector, for instance, the end of oil price subsidies and repayment of the oil fund's massive debt accrued by the previous government's subsidy program; implementation of aggressive policies to promote renewable energy (including biofuels), cogeneration and distributed generation; adoption of Euro 4 fuel qualities and introduction of vapour recovery systems for petrol stations; adoption of a number of standards and incentive programs for energy efficiency; awards of a large number of petroleum concessions, issuing of IPP solicitation; conclusion of a number of power purchase agreements for projects in Laos; establishment of a nuclear power program with a target for 4,000 MW of nuclear capacity in 2020-2021; and amendment of a number of energy-related laws.The most important law passed during his term as energy minister was the Energy Industry Act to establish an independent regulatory body for electricity and natural gas.