As power systems become increasingly electrified and renewable‑led, the challenge at the forefront is not always how to build more infrastructure but how to design energy systems more efficiently, a critical priority in today’s volatile and fast‑changing energy landscape. To support policymakers, planners and system leaders navigating rising demand and investment constraints, this briefing sets out how a flexibility‑first approach can improve affordability, strengthen energy security and avoid unnecessary system costs.

Drawing on current evidence and practical examples, the piece outlines the actions needed to unlock flexibility at scale and highlights the decisions, trade‑offs and implementation pathways required to deliver resilient and cost-effective energy systems for decades to come.