Natural gas was discovered in Clinton County in 1887. In 2008, the state produced 85 billion cubic feet of natural gas, which nearly 100% of the production stayed in the state, enough to heat 1 million homes. The Rockies Express Pipeline was recently completed, connecting the eastern part of Ohio with natural gas production facilities in Colorado. 1.1 trillion cubic feet of natural gas reserves are estimated to be in Ohio's portion of Lake Erie alone.