The great hype surrounding the advent of a shale gas bonanza in California may turn out to be just that: hype. The U.S. Energy Information Administration (EIA) – the statistical arm of the Department of Energy – has downgraded its estimate of the total amount of recoverable oil in the Monterey Shale by a whopping 96%. Its previous estimate pegged the recoverable resource in California’s shale formation at 13.7 billion barrels but it now only thinks that there are 600 million barrels available.