The world needs a new source of energy, an unspillable source.

How much did Exxon have to pay for Exxon Valdez spill?

I found different numbers about how much Exxon had to pay. I read about 1.5 Billion Dollars in the criminal settlement, and about 5 Billion Dollars for punitive damages (which was later reduced to 500 Million). What exactly is the difference? What was either money used for?
That’s where I found the 1.5 Billion Dollar sentence: http://www.evostc.state.ak.us/History/settlement_detail.cfm