These global trends are manifest in the U.S. West, where state and regional policies have changed the energy landscape and created a learning laboratory for renewable development and deployment. NREL's analysis has been instrumental in articulating challenges, evaluating options, and offering solutions to support expansion and integration of renewables into the western grid. The results from these studies have guided decision makers in state governments, utilities, and regulatory agencies in the West (Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming) by shedding light on: (1) Growth and potential for renewable energy in the western United States; (2) System-level changes as renewable energy grows beyond requirements of state renewable portfolio standards (RPS); (3) Challenges and opportunities for new RE projects in the West.