Constellation Energy’s top executive could pocket nearly $50 million if he leaves the company under certain circumstances following its sale last week to MidAmerican Energy.

Constellation Chairman, President and Chief Executive Officer Mayo Shattuck could be in line for an $18 million cash severance package, $29.6 million in enhanced pension payments and $48,000 in health benefits, according to the company’s April proxy filing with the Securities and Exchange Commission.