WARSAW (Reuters) -Polish state-controlled power utilities PGE, Enea, Tauron and Energa received offers from the state treasury for their coal-fired power plants in a planned overhaul of the energy sector. The treasury offered 849 million zloty ($214.23 million) for PGE's mining and generation unit, 2.48 billion zloty for Enea's Wytwarzanie unit and 632 million zloty for its Polaniec unit, and 153 million zloty for Energa's Ostroleka power generation unit.