1. National Grid. Electricity transmission operational data: historical demand data, 2015. Available from: http://www2.nationalgrid.com/UK/Industry-information/Electricity-transmission-operational-data/Data-explorer/
2. National Grid. Gas seasonal and annual data, 2013 Available from: http://www.nationalgrid.com/uk/Gas/Data/misc
3. Historical daily gas and electrical energy flows through Great Britain's transmission networks and the decarbonisation of domestic heat
4. Network infrastructure and energy storage for low-carbon energy systems;Dodds,2015
5. Coalition study. Commercialisation of energy storage in Europe. McKinsey & Company, 2015. Available from: http://www.fch.europa.eu/sites/default/files/CommercializationofEnergyStorageFinal_3.pdf