Navajo Nation officials and the vice president of a Houston-based energy company have signed lease agreements that would allow a 1,500-megawatt power plant to be built on tribal land in northwestern New Mexico. Navajo President Joe Shirley Jr., Sithe Global Power executive vice president Dirk Straussfeld and Steven Begay, general manager for the tribe's Dine Power Authority, inked the documents during a ceremony Thursday. The coal-fired Desert Rock Power Plant, when complete, would produce enough electricity to power up to 1.5 million homes. It's expected to provide more than 1,000 jobs during construction and as many as 400 permanent jobs....