Browne was chairman of fracking company Cuadrilla Resources until March 2015 and the managing director and partner of Riverstone Holdings, the venture capital firm that backs it. He also co-ran Riverstone's private equity renewable energy fund, reportedly the largest of its kind in the world. He relinquished both roles upon taking up a new position as executive chairman of the new Russian-backed energy investment outfit, L1 Energy in March 2015. The same year he also joined the board of Huawei Technology, a leading provider of 5G technology.
Government advisory role
In June 2010 Browne was appointed as the new Coalition government's 'Lead Non-Executive Director' at the Cabinet Office, charged with recruiting business leaders to reformed departmental boards.
- His remit is to work with Secretaries of State to appoint non-executives to the board of each government department; to improve governance across Whitehall; and to build leadership and management through the non-executives and the boards. Lord Browne also convenes network meetings of non-executives across Whitehall to consider the big issues that challenge all government departments and share best practice.
He stepped down from this position on 31 January 2015.
Fracking and solar enthusiast
As chairman of the controversial fracking firm Cuadrilla Resources until 2015, Browne led the charge for fracking in the UK for many years.
However, in June 2019 Browne admitted in an interview with the Observer that "fracking in the UK doesn’t make much sense. I think it was a test to see if it worked. We probably don’t need to do it." 
Shale gas will not lower UK gas bills
In November 2013 at a lecture at the London School of Economics Browne had admitted that shale gas exploration would not lower gas bills in the UK. This contradicted the high-profile claims made just months beforehand by UK Prime Minister David Cameron and Chancellor George Osborne that it could help curb soaring energy bills.
Browne told his audience that 'we should make more use' of solar technology. He appeared less supportive of the UK government's controversial decision to back French firm EDF Energy's new nuclear power plant at Hinkley Point. Nuclear power, said Browne, was 'very, very expensive indeed' and the siting of new reactors on the coast when sea level and storm surges are rising was a 'big issue' and so they must be made resilient.
Browne was also critical of the government's continued bias for fossil fuels describing the fact that more state subsidies are given to oil and gas than to renewable energy as 'like running both the heating and the air conditioning at the same time'. 
In 2014 Browne was on the international advisory board chairman of Mubadala Oil and Gas, a company owned by the government of Abu Dhabi, which at the time had signed an agreement with Somalia's government to help it find oil. When asked about this, Lord Browne declined to comment and Mubadala is not declared in his register of interests.
- Lord Browne of Madingley was born in 1948. He joined BP in 1966 as a university apprentice. He holds degrees from Cambridge University and Stanford University, California. He is a Fellow of the Royal Society, the American Academy of Arts and Sciences and the Royal Academy of Engineering. He has numerous honorary degrees, fellowships and awards.
- He joined the Board of BP in 1992 and became its Group Chief Executive in 1995 until 2007. He has been the Chairman of the Advisory Board of Apax Partners LLC (2006-7), non-executive director of Intel (1997-2006), DaimlerChrysler AG (1996-2001), Goldman Sachs (1997-2007) and SmithKline Beecham (1996-1999). He was voted ‘Most Admired CEO’ by Management Today from 1999-2002. He was knighted in 1998 and made a life peer in 2001.
- He is presently a Partner of Riverstone Holdings LLC, a company which invests in renewable and conventional energy. He is Chairman of the Board of Trustees of Tate, Chairman of the Trustees of the Queen Elizabeth II Prize for Engineering and Chairman of the International Advisory Board of the Blavatnik School of Government at Oxford University. He is a member of a variety of other advisory boards.
- L1 Energy Fund - Browne is a member of L1’s advisory board, alongside BG Group chairman Andrew Gould and former boss of US oil firm Anadarko Petroleum Jim Hackett. Alfa Group is owned by Russian billionaire Mikhail Fridman. L1 will be run by his business partner German Khan, who becomes L1’s chief executive.  (L1 is referred to in the Register of Interests as formerly Letterone Petroleum Limited)
- Deutsche Bank - Advisory Board for Climate Change
- Deutsche Bank Europe - Advisory Board
- Schlumberger Business Consulting, Advisory Group
- Stanhope Capital - Chairman
- Mubadala Oil and Gas International - Chairman
- Letterone Petroleum Limited - Member of the advisory board
- Cuadrilla Resources Holdings Ltd - Chairman, Board of Directors
- White Rose Energy Ventures LLP - Director
- Fairfield Energy Ltd - Director
- Huawei Technologies (UK) Co Limited(communications technology)- chairman (2015)
- Pattern Energy Group Inc - director
- Lord Browne of Madingley, www.parliament.uk, accessed 15 April 2013.
- Government Lead Non-Executive Lord Browne of Madingley, gov.uk, undated, acc 14 October 2014
- John Vidal, Ex-BP boss John Browne: ‘It’s going to take a long time to take oil and coal out of the energy system’, The Observer, 8 June 2019, accessed 10 June 2019
- Damian Carrington, [Lord Browne: fracking will not reduce UK gas prices] The Guardian, Friday 29 November 2013, acc 1 December 2013
- House of Lords Wall Street Journal, 10 November 2014, accessed 10 December 2014
- Lord Browne to advise $20bn oil and gas fund, City A.M., 18 June 2013, 2:38am, acc 14 Oct 2013
- Lord Browne of Madingley Parliament.UK, accessed 10 December 2014