Since 2014 EDNA – the Electronic Devices and Networks Annex of 4E – has helped its 14 member countries to better understand digital technologies. Our extensive research into how policies can both encourage ‘energy smart digital devices’, and minimise the additional energy used to connect devices to the internet, has resulted in more than 60 publications. In this article we look back over our work and extract the key learnings. Links to important EDNA reports and policy briefs can be found throughout the text.