His replacement as HR director across both the residential and business arms of British Gas is Jill Shedden, who joined the company in 1988 as a graduate trainee.
Shedden will report to new managing director Phil Bentley, and will be working with the British Gas executive team to "put people at the heart of its strategy", the company said.
Turner, who had been the energy giant's HR director for six years, has taken up a position as director of transformation. His key tasks will be "defining and implementing a strategic business operating model to improve accountability and performance across the residential energy business", according to British Gas.
Turner started his HR career at Unilever as a graduate trainee in 1978. He has been outspoken on the need for trade unions to find better workplace reps, urging employers to do more to encourage staff to train up.
British Gas has about 25,000 employees.