The United States is the single largest domestic user of energy and spends more than $9 billion to power its vehicles, operations, and approximately 500,000 facilities throughout the country. Camp Pendleton hosted an annual Energy Awareness event, Nov. 3 at the Mainside Plaza to educate Marines and sailors about energy efficiency.::r::::n:: - The United States is the single largest domestic user of energy and spends more than $9 billion to power its vehicles, operations, and approximately 500,000 facilities throughout the country. Camp Pendleton hosted an annual Energy Awareness event, Nov. 3 at the Mainside Plaza to educate Marines and sailors about energy efficiency.::r::::n::