Stephen Edwell is an economist specialising in the reform and access regulation of utility services. Mr Edwell was appointed chair of Horizon Power in 2018. He has led teams to restructure electricity markets in Queensland and Western Australia, including implementation of the Western Australian wholesale electricity market. Mr Edwell was the inaugural full-time chair of the Australian Energy Regulator between 2005 and 2010 and has been a governing body member of the ERA since 2006. He has provided advice on economic regulation issues to the Western Australian State Government on projects such as Wheatstone, Browse and Oakajee port and rail, and has managed various energy projects in the Pilbara including Pilbara Power. Mr Edwell resigned from the ERA in April 2017.