232. GB’s NESO: the “cool” operator - Jun26
From Redefining Energy by Laurent Segalen and Gerard Reid
June 8, 2026 · 29 min
About this episode
The episode features a discussion with Fintan Slye about NESO's role in Great Britain's energy system and the challenges of balancing supply and demand amidst increasing reliance on renewables.
Gerard and Laurent have the pleasure of welcoming Fintan Slye, CEO of NESO — Great Britain’s National Energy System Operator. In a lively and wide-ranging discussion, we explored NESO’s governance and its critical role across the British energy system: from real-time system operation — balancing supply and demand every second — to whole-system planning, market design, and transmission network operation. We covered an extraordinary breadth of topics: balancing costs, electricity prices for consumers, energy security, and the challenge of delivering Power 2030 in a system increasingly reliant on renewables. We discussed batteries, the evolution of balancing markets, the explosive growth of datacenters, and the ever-growing grid connection queue — and, above all, how to keep the entire system stable and efficient through this transformation. One of the most fascinating parts of the conversation focused on datacenters. NESO is currently facing more than 100GW of connection requests, while Fintan estimates that only 8–12GW are likely to materialise. He shared the three key criteria NESO uses to prioritise and filter applications — a crucial issue as electricity demand enters a new…
People in this episode
Hosts: Laurent Segalen, Gerard Reid
Guest: Fintan Slye
Topics covered
- energy system operation
- market design
- electricity prices
- energy security
- renewables
- datacenters
- interconnectors
Keywords
- NESO
- energy system
- balancing markets
- electricity demand
- datacenter growth
- interconnectors
- Power 2030
Mentioned in this episode
Organizations: NESO, Power 2030
Places: Great Britain, North Sea Islands, Canada
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