Salt Lake Tribune: In the world of solar power, Salt Lake County is poised to become a star. The county will unveil plans next week for an expansive solar array atop the Calvin L. Rampton Salt Palace Convention Center — so large it would cover six football fields — that experts believe will be the biggest of its kind in the nation. "This is not just going to be an impressive installation for Utah," said Ted Rose, vice president of business development and public affairs for NexGen, one of two …