The British Hydropower Association (BHA) has published new technical guidance on reservoir safety for pumped storage hydropower (PSH) schemes in the UK, reflecting growing industry focus on long-duration energy storage infrastructure.
The document, developed by a working group of reservoir engineers, hydropower developers, consultants and operators, sets out a risk-informed framework for the planning, design, construction and operation of pumped storage reservoirs.
The guidance responds to increasing deployment of pumped storage projects intended to support the integration of renewable energy into the electricity system. According to the document, many proposed schemes involve high pumping capacities, rapid operational cycling and greater reliance on control and automation systems than conventional reservoirs.
The publication states that existing reservoir safety guidance was largely developed for passive, naturally fed reservoirs and does not always address the operational characteristics of modern pumped storage systems.
Key areas covered include spillway provision, drawdown capability, hydraulic infrastructure interfaces, operational safety, control systems and risk management. The guidance also examines the interaction between civil infrastructure and automated operational controls.
A central theme is the distinction between natural flood risks and operational risks associated with pumped inflows. The guidance notes that pumped inflows can exceed natural inflows by several orders of magnitude, meaning that control-system failures, operational errors and abnormal plant behaviour can become significant safety considerations.
The document does not introduce new regulatory requirements but is intended to support professional judgement within the existing UK reservoir safety framework. It promotes an approach based on reducing risks to levels considered “as low as reasonably practicable” (ALARP).
The BHA said the guidance would be updated over time as further pumped storage projects are developed in the UK and internationally.
