NV Energy is asking regulators for permission to retire a utility-owned coal plant, 10 months earlier than expected, as it moves to a cleaner fuel portfolio. The utility shut down three of four generating units at its 257-megawatt Reid Gardner Generating Station in Moapa at the end of 2014. If the PUC approves, it will shut down the final Reid Gardner unit Feb. 28. NV Energy originally planned to fully shut down the coal burning plant in December of next year.