Joining the SDEN

If you are building a new development or own a large site in the region then we would like to hear from you, please get in contact using our email:

Benefits of SDEN to the developers

  • Reductions in construction costs
  • Increased lettable floor area
  • Enables developers to meet planning regulations more easily.
  • Reduced exposure to green taxes & levies
  • Avoids ongoing heating plant maintenance
  • Better resilience than conventional heat supplies
  • Participation in an innovative scheme that will deliver significant carbon savings

Our Vision

We are pleased to introduce SDEN, a truly ground-breaking initiative that will ultimately deliver low carbon supplies of hot water for heating and domestic hot water uses across South London.

Our ambition is to utilise local sources of heat to become a key supplier of low carbon heating in South London.

SDEN will significantly reduce fossil fuel use, contributing towards our goal of lowering our carbon emissions.

We are already working on Phase 1 of our network which will supply heat to around 725 homes, a care home and a supermarket at the new New Mill Quarter (formerly Felnex) development.

Next we will look to expand the network across South London. We want to work with you to tap into this sustainable, low carbon supply.

Developer FAQs

How common are decentralised energy networks?

There are at the time of writing over 180 decentralised energy networks projects, across over 120 local authorities, under development. These schemes are supported by the Department for Business Energy and Industrial Strategy (formerly the Department of Energy and Climate Change).

How will the SDEN work for my development?

SDEN will use renewable and low carbon fuel sources initially using waste heat from the existing landfill gas engines in Beddington. Then, once the Beddington Energy Recovery Facility (ERF) is constructed, it will use heat produced by the plant. This heat (in the form of hot water) will be transported through highly insulated pipes to customers who are likely to be in new developments. There is the potential to serve some existing developments if it proves cost effective. Phase One of SDEN is planned to serve the New Mill Quarter (formerly Felnex) development in Hackbridge which is being developed by Barratt Homes.

The heat is delivered to your development in exactly the same as a conventional heating or hot water system which would use a boiler with either radiators or underfloor heating. It is just the source of heat that is different, being supplied into your development from our off-site heat sources rather than an individual boiler in your property. 

SDEN offers better reliability compared to conventional heat supplies. When our off-site low-carbon sources of heat are occasionally offline for maintenance, supplies of hot water will be maintained from our backup and top-up boilers.

Inside the properties this hot water from our network goes through a Heating Interface Unit (HIU) which supplies homes with hot water for your hot taps and shower and for your central heating. The amount of heat energy taken from our network is controlled by the customers through the controller in their home.

How long will supplies be made for my development?

We expect the SDEN to be operating over a longer period than the initial contract with ERF. One of the benefits of the SDEN network is that it can connect to other energy sources over time, so the ERF does not have to be the only source of heat over the longer term. The buried heat network is a long life infrastructure asset which we expect to last for at least 50 years.

How will my residents pay for heating and hot water?

In short, a price that is and remains competitive with the energy market. SDEN will offer price parity with the cost of gas in an individual boiler from other energy suppliers as well as the cost of running, maintaining and replacing that boiler, as properties served by an SDEN will not need boilers.

Will heat be available to my residents 24 hours a day, 7 days a week?

Yes. Heat will be supplied from a continuous source, with top up and back up boilers providing security when the sources of low carbon heat (such as the ERF) are not available during maintenance periods.