Oglethorpe Power Corporation ( OPC ) is one of the nation's largest power supply cooperatives with more than $8 billion in assets serving 38 Electric Membership Corporations which, collectively, provide electricity to more than 4.1 million Georgia citizens. A proponent of conscientious energy development and use, OPC balances reliable and affordable energy with environmental responsibility and has an outstanding record of regulatory compliance. Its diverse energy portfolio includes natural gas, hydroelectric, coal and nuclear generating plants with a combined capacity of approximately 7,074 megawatts (summer planning reserve capacity), as well as purchased power. OPC was established in 1974 and is owned by its 38 Member Systems. It is headquartered in Tucker,Georgia.