Fabby Tumiwa is an energy transition strategist and the Chief Executive Officer (CEO) of the Institute for
Essential Services Reform (IESR), an Indonesian think tank on energy policy and the environment. IESR
advocates rapid clean energy deployment and energy system decarbonization in Indonesia.

Fabby has over 25 years of experience in energy and climate policy and regulation and is a seasoned
practitioner in renewable energy and energy efficiency. He advises Indonesian government agencies,
businesses, NGOs, bilateral and multilateral development organizations on electricity, renewable energy,
energy efficiency, sustainable energy finance, and climate change policies. He was the founder of of
Indonesia Solar Energy Association (ISEA) in 2016 and serve as its chairman from 2021 to 2024.

He advises numerous international organizations in his capacity as a member of the IEA Technology and
Innovation Advisory Board, the World Energy Forum’s Energy and Industry Transition Intelligence (EITI)
Advisory Board, and the Green and Low Carbon Expert Network (GLEN) of BRIGC.