Associated Press: A westward dash to power electricity-hungry cities by cashing in on the desert’s most abundant resource — sunshine — is clashing with efforts to protect the tiny pupfish and desert tortoise and stinginess over the region’s rarest resource: water. Water is the cooling agent for what traditionally has been the most cost-efficient type of large-scale solar plants. To some solar companies answering Washington’s push for renewable energy on vast government lands, it’s also an …