Sutton Council issue statement over SDEN claims Sutton Council have agreed to carry out an independent review of the Sutton Decentralised Energy Network (SDEN) following claims about its financial sustainability. The review comes after months of concerns raised over the quality of the council-owned energy supplier, which residents rely on to receive energy to their homes and businesses. The council said that SDEN was introduced in 2016, to combat the climate emergency and provide low carbon hot water and heating to homes at the New Mill Quarter development in Hackbridge. But over the past twelve months, residents at the New Mill Quarter have reported around twenty network fails which have left hundreds of them without heating and water.