St George's Hospital Tooting

The issue

St George’s University Hospitals NHS Foundation Trust had a target to deliver a minimum of 20% saving on utility consumption in in year one and also meet its obligation of a 10% CO2 reduction by 2015.

They needed to do this in a cost effective manner that would generate a return as quickly as possible within the constraints of a being made up of variety of aging buildings and running a 30-year old energy centre.

Our approach

We worked with the Trust to facilitate an Energy Performance Contract (EPC) with British Gas and Breathe Energy, two energy saving companies on the Essentia EPC procurement framework. The resulting £12 million project comprises a range of energy-saving measures including the installation of combined heat and power (CHP) engines and solar photovoltaics, as well as upgrades to heating and cooling infrastructure.

The EPC guarantees that the measures implemented will generate sufficient savings to pay for the project. Any additional savings gained after the contract ends revert to the Trust.


Over the 15-year contract, the Trust’s total energy costs will reduce by 25% and more than 6,000 tonnes of carbon emissions will be saved each year.

Financial savings to the Trust are estimated at more than £1 million a year.

“Working with Essentia to deliver our Energy Centre has added value throughout the project. Essentia’s ongoing support from inception through to the procurement stage has contributed to the success of this ambitious project which will deliver over £1 million in savings to the Trust each year”.

Rathan Nagendra, Energy Manager, St George’s University Hospitals NHS Foundation Trust