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your colleague might look at the countries portal on https://www.energypedia.info. Although electricity subsidies are not a topic by its own you might find such information on the respective country pages and further useful links to national policies and authorities. Direct link: https://energypedia.info/wiki/Portal:Countries
Furthermore, since energypedia is a wiki, every registered user can add further information to the articles, so once your colleague has finished his/her research he/she is very much invited to share results with the public on energypedia.