Nevada Geothermal Power Inc. said last week it may not be able to meet a year-end debt payment on its Blue Mountain geothermal plant near Winnemucca.The company said power production from the plant fell short during the third quarter and studies indicate that the temperature of hot water from wells at Blue Mountain will continue to decline without the development of new wells.Making matters worse, a pump at the plant broke down, a small fire broke out and one of the plant's three power units was shut down during September and October, Nevada Geothermal Power said in a filing with …