Barclays said it will contest a record £300 million fine imposed by the US energy regulator in court.
The Federal Energy Regulatory Commission has accused the banking giant of fixing electricity prices in California and other states for more than two years.
Four of Barclays former traders also received fines for allegedly fixing power prices between November 2006 and December 2008.
More top news
The 12 Years A Slave director is filming an artwork as a 'lasting memorial' to the Grenfell Tower fire tragedy.
A frosty start to Sunday for many with slow-clearing mist and fog in the southeast.
Diane Abbott said Labour's position is to have 'less bureaucracy' in order to allow easy movement for EU migrants.