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Hospital benefits from advanced BESS


Veolia, working through its specialist energy team, has commissioned a new Battery Energy Storage System (BESS) at the 500-bed Rotherham Hospital as part of a 20-year Energy Performance Contract (EPC). The BESS is engineered into the electrical infrastructure and CHP system


T


he 500kWh storage capacity will contribute to targeted EPC savings of over £1 million per year, provide an energy income, increase


resilience of the energy supply, and enable the Rotherham NHS Foundation Trust to cut carbon emissions by 49,620 tonnes. The EPC used by the Trust is the NHS standard performance contract, managed, procured, financed and monitored for its lifetime by the Carbon and Energy Fund With a growing sustainable energy supply in the energy mix, grid resiliency is important to manage the variable availability of sustainable energy sources such as wind and solar power. To counter these variations the battery system effectively balances the output of renewable energy sources which operate in a less predictable manner compared to traditional power stations. When


discharging at peak time, the battery displaces the marginal generator which is still fossil fuelled power for most of the year. In this way it will perform a key role in the transition to a sustainable decarbonised electrical supply. The Battery Energy Storage System (BESS)


comprises multiple battery cells that store electrical energy produced for use at a later time. Based on the latest lithium-ion technology the battery unit is capable of delivering 500kWh, equivalent to the energy output from 130,000 standard AA size batteries. The technology enables the Trust to take advantage of reduced electricity bills by discharging power, when the demand is highest, which reduces imported electrical consumption and peak electrical import charges. Because of its unique reaction speed, and fast acting controls, it provides continuous


stability for the National Grid by adjusting power flows at each millisecond to balance the surplus or lack of energy on the network. Engineered into the electrical infrastructure and


CHP system by Veolia, the BESS enables the Trust to gain income from the grid by exporting power when there is less power being generated than used by consumers, and also for absorbing power when more power is being generated than is being used by consumers. This reduces electrical bills via the BESS’s ability to discharge power at these key times and reduce imported electrical consumption and import charges. This adds to the financial benefit gained from the fast frequency response through grid stabilisation. Control takes place automatically via a third party


Aggregator, which manages electricity assets to counter load imbalances in response to changes in energy demands.


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