Winser, who will also become a member of the audit, management engagement and nominations committees, will join the board from 1 January 2022.
His 30-year career in the energy sector included his roles at National Grid (LSE:NG.) as UK and European CEO, as well as president of the European Network of Transmission System Operators for Electricity and chair of CIGRE UK.
Winser has been the chairman of Energy Systems Catapult since 2015 and chaired the advisory board for the Energy Revolution ISCF programme in 2018 and served on the advisory panel for the Cost of Energy Review in 2017. He is also part of the Net Zero Expert Group and a COP26 advisory group which advises the Secretary of State.
Greencoat UK Wind chairman Shonaid Jemmett-Page said: "With Nick's extensive experience in energy markets and regulation we believe that he will make a valuable contribution to the company."