Barclays made billions in that time period
Which means again this fine will just be a drop in the bucket cost of doing business. The fact that the public bore the brunt of these profit generating schemes could be why it has taken this long for the wrongdoing to be addressed.
Of course Barclays promises to fight this.
US regulators have fined Barclays $435m (£287m) for manipulating energy markets in California and other states from November 2006 to December 2008.
Barclays and four of its traders must also pay $34.9m to the low-income home energy assistance programs of Arizona, California, Oregon and Washington.
They have 30 days to pay the fines imposed by the Federal Energy Regulatory Commission.
Barclays said it intended to "vigorously defend this matter".
"We are disappointed by the action that FERC took today. We believe the penalty assessed by the FERC is without basis, and we strongly disagree with the allegations made," it said in a statement.