Dixons Carphone UK and Ireland chief executive Katie Bickerstaffe is exiting the electricals retailer after 10 years to take up a new role at an energy firm.
Bickerstaffe has been appointed chief executive designate at a new energy supply business recently formed by SSE and Innogy.
She will take up the post later this year.
Baldock said: “Katie’s dedication, passion and hard work has helped transform and strengthen the business into a market leader during a period of significant change. I look forward to working closely with Katie in the coming months and wish her every success when she moves to her exciting new role.”
Bickerstaffe added: “I am incredibly proud of the group’s achievements over the last few years, laying the foundations for a great future. After 10 wonderful years in the business, I feel it is the right time to move onto my next challenge.”
Last month, the retailer appointed Halfords finance boss Jonny Mason to replace Humphrey Singer, who quit to join M&S.