Mr Hendry, who served as Energy Minister between 2010 and 2012, will provide an independent challenge to the company’s business plan.
He is also the Chair of the Smart Power Industries Alliance, which was established last year.
He said: “The changes in our electricity system over the next few years will be the biggest changes any of us have ever seen. It will see a transformation of how and where power is generated and of the relationship between companies across the energy sector and their consumers.
“I am delighted to have been asked to chair this independent user group for SP Energy Networks, to scrutinise their proposals and to ensure that the views of the users across their networks are fully taken into account. This is vital to make the system best serve consumers’ interests.”