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CASE STUDY: TRANSPORT HESOP energy saver London Underground London Underground chose Alstom’s innovative HESOP energy saver as a one-stop environmental solution for its metro. HESOP enables the recovery of more than 99% of the available energy generated during braking, thereby reducing energy consumption, tunnel heating and CO2 emissions. KEY BENEFITS High energy savings Thanks to dynamic voltage regulation, HESOP captures more than 99% of the available braking energy. The recovered energy is re-distributed into the HV network and can be used by station and tunnel equipment: escalators, lighting, ventilation, lifts and other traction substations. Reduced tunnel heating Thanks to full recovery of the available braking energy, HESOP reduces train heat dissipation, a notable problem in London Underground’s tunnels.This means the requirement for tunnel and in-station ventilation is reduced, and also allows for the removal of on-board brake resistors, which in turn reduces the train’s weight. Network evolution HESOP will allow London Underground to modify the network voltage from 630V to 750V in the future without modifying the HESOP converter. HESOP LUL casestudy 01/14 ©ALSTOM 2014. ALSTOM, the ALSTOM logo, HESOP and all alternative versions are the brands and trademarks of ALSTOM. The other names mentioned, registered or not, belong to their respective owners. Photo credits: ©ALSTOM Transport /Pagecran CASE STUDY: TRANSPORT HESOP energy saver for the London Underground ALSTOM SUPPLY TECHNICAL FEATURES The HESOP inverter unit will have the following electrical characteristics LINE SPECIFICATIONS For more information please contact Alstom Transport: Alstom Transport 48, rue Albert Dhalenne 93482 Saint-Ouen, Cedex France Phone: +33 1 57 06 90 00 Visit us online: www.alstom.com/transport Hesop LUL casestudy 07/13 ©ALSTOM 2013. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. HESOP is a trademark of Alstom.