The company has until May 24 to file a response to the recommendation , and the commission says it expects to decide on the penalty in late summer . NEW : Regulators could approve the recommended fine in late summer . The San Bruno , California , explosion killed 8 people . It was caused by a natural gas leak at an underground storage facility for oil and gas that is owned by Proposed $ 2.25 billion fine would be largest state penalty , regulator says .
NEW : Regulators could approve the recommended fine in late summer . The San Bruno , California , explosion killed 8 people . It was caused by a natural gas leak at an underground storage facility for oil and gas that is owned by Proposed $ 2.25 billion fine would be largest state penalty , regulator says .