A reliable and resilient electrical grid is critical not only to our national and economic security, but also to the everyday lives of American families,” Perry said in a letter accompanying the rule. “A diverse mix of power generation resources, including those with on-site reserves, is essential to the reliable delivery of electricity — particularly in times of supply stress such as recent natural disasters. My proposal will strengthen American energy security by ensuring adequate reserve resource supply and I look forward to the Commission acting swiftly on it.