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Challenge / Goal

In England, Nottingham’s ambition as a smart city was to reduce carbon emissions by 26% and generate 20% of its energy requirements from renewable and low carbon sources by 2020. The Nottingham City Council aimed to create a citywide heat network that would further enable Nottingham to cope with climate change and build resilience to external energy price pressures. To speed up the process toward 20% energy efficiency improvement required by the EU by 2020, the huge energy-saving potential in the building sector and the expansion of existing district heating network with more energy efficient ones had to be exploited.

The objective of the project was therefore to expand the existing district heating network with a more energy efficient one (using the return flow). At the same time achieving a reduction in carbon emissions, increase in IT and technical interfaces, increase in comfort, and an overall reduction in energy bills.       


A branch emanating from the return pipe of the existing district heating system in Nottingham was created to use low temperature heating for the first time on such scale in the UK. The development extracted unused heat from existing district heating system to make it more efficient and profitable. Extracting additional heat from the existing network but with a lower temperature allowed Nottingham City Council's network to be accesible to a wider range of customers, at lower cost and make it suitable for domestic customers.  The LTDH is delivered at 60 degrees, using a heat exchanger from the 70 degree return pipes.  The Smart Controllers lower the return temperature of the LTDH network and maximises the network efficiency:

  • Smart Net Controller (from Sasie): to better manage and control a DH or LTDH Systems in order to improve its efficiency.
  • Skid (Enviroenergy ltd.): improving the efficiency and maintenance time of pumps


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Time period

Planning time: 1 to 2 years

Implementation time: 1 to 2 years


Nottingham City Council

Service providers

SASIE, EnviroEnergy

    Main benefits

  • Improving energy supply efficiency

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