WASTE ENERGY FROM TUBE TRAIN BRAKES COULD SAVE £6 MILLION A YEAR
A world-first trial that uses the latest technology to collect waste energy from Tube train brakes has captured enough power to run a large Underground station – opening the way for significant savings across the network.
London Underground (LU) used the new ‘inverter’ system at the Cloudesley Road substation on the Victoria line for a five-week trial, and in just one week of operation, the new technology recovered enough power to run a station as large as Holborn for more than two days per week.
The results show that the new green technology could allow LU to tap into a previously inaccessible resource, reducing its overall carbon footprint and saving as much as £6 million every year for reinvestment in improving transport.
As well as saving energy, the technology has the added benefit of lessening the amount of heat generated by trains braking in tunnels, which in turn would reduce the energy required to operate LU’s cooling systems.
The results indicated that 1 Megawatt hour (MWh) of energy can be captured per day – enough to power 104 homes per year.
The trial follows a number of other measures put in place by the Mayor and Transport for London to ‘green’ the Capital’s Tube system.
In January it was announced the historic Greenwich Power Station would be revamped to transform it into a low-carbon power generator for the Tube network. Its six new gas engines will replace existing boilers and provide cheaper, cleaner power for the Tube, with waste heat being channelled into a new local heat network that will also benefit residents.
LU is carrying out its largest programme of modernisation in decades, with major stations, trains, track and control systems being updated or replaced to meet the needs of the rapidly growing city and provide a 30 per cent increase in capacity across the Tube network.
All future Tube line upgrade projects now have whole-life energy costs embedded into their programmes to encourage research, adapt sustainable technology and reduce energy requirements.
The results of the Victoria line ‘inverter’ trial are a stepping stone to other projects, with the aim of maximising the efficiency of electricity use on LU rail networks. (Source: TfL press release.)