Environment News Service: Trying to resolve technical difficulties that still prevent greater integration of solar energy into the nation’s power grid, the U.S. Department of Energy has identified $2.9 million in private-sector solar projects it hopes to fund this fiscal year. The DOE funding, which requires Congressional approval, would pay two-thirds the cost of the projects, with another $1.7 million to be contributed by private industry. The program overseeing the projects, managed by Sandia …