Running a multi-billion dollar energy company isn't easy. Just ask the executives in the corner suites of some of the energy companies that have gone bust over the years. Some, like Enron, were brought down because of insider malfeasance. A few, like ATP, blamed damaging government policies, while others went off the rails due to market forces that left the company and its shareholders flat-footed, deep in debt, and eventually broke. Here are the bankruptcies that will be etched into the tombstones of failed energy fortunes for time immemorial.