This is the first of a series of Implementing Acts on Data Interoperability adopted by the European Commission as per Article 24 (2) of Directive (EU) 2019/944. The Implementing Regulation for access to metering and consumption data, in force since July 2023, describes rules enabling final customers in the retail electricity market and eligible parties to access metering and consumption data, in a simple, timely, and secure manner. Moreover, it ensures that suppliers and service providers have transparent and seamless access to final customers’ data – provided customers have given the required permission –in a way that makes the data easy to understand and use.