With twenty-two chapters written by leading international experts, this volume represents the most detailed and comprehensive Handbook on electricity regulation ever published. The volume covers the existing state of best-practice regulation in the US, UK, the European Union and Australia, for both electricity transmission, electricity distribution and retail electricity. The regulatory challenges of the energy transition are discussed. These include the need for regulators to incentivise large amounts of investment in conditions of uncertainty and to promote innovation. Deep decarbonisation, via electrification, raises regulatory issues for electric vehicle charging infrastructure and hydrogen networks. The book also considers the state of electricity regulation in China, India and smaller lower and middle income countries. These jurisdictions have underdeveloped regulatory systems which can benefit from learning from more advanced regulatory systems as long as there is sufficient adaptation to local contexts. The Handbook is intended to be used by those with direct interests in electricity regulation. Students and young professionals will find the information they need to enter the field in a single source. Researchers, experienced professionals and public decision-makers will get a comprehensive update on topical issues in electricity regulation. This will help them make sense of a sector that is undergoing profound change at the same time as the public policy motivations for regulation are not diminishing.