National Grid ESO (Electricity System Operator) is a key player in the UK's energy sector, responsible for balancing supply and demand to ensure a stable and reliable electricity system. They make money by providing essential grid management services, including real-time system balancing, market facilitation, and long-term planning to integrate renewable energy sources. Established as a separate entity from National Grid plc in 2019, National Grid ESO plays a critical role in the transition to a low-carbon energy future, making it an exciting and impactful place to work.