Ewah has worked on energy and environment reform issues in twelve African countries. He has specialised in the practical issues associated with expansion of energy access, energy and climate change linkages and public-private-partnership.

Ewah has over the past 20 years been consulting for the World Bank, UNDP, Governments of Canada, Norway, United States, United Kingdom, and the Federal Government of Nigeria. He is the Lead Author of the Renewable Energy Master Plan for Nigeria – the Federal Government’s 20-year Renewable Energy Investment Framework.

Ewah is the Executive Director of ICEED and coordinates the climate change governance reform coalition, Nigeria Climate Action Network.