Branch in Slantsy

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A successful DHN optimization 

Type of contract: concession of the heating network of Slantsy (Saint-Petersburg region)

Contract duration: 25 years, operations were launched in 2008

Implementation of the investment program was fully completed in 2009-2012

Number of clients: 33,000 inhabitants

Length of networks: 68 km

Initial situation:

  • Outdated and worned boiler plants (7) / networks at the end of their life cycle
  • ​Longstanding absence of the right level of preventive maintenance
  • ​Enormous technical losses (water > 100 tons / h, heat > 35%)


  • Reconstruction of the main boiler plant and closing of small scale unefficient boiler plants
  • Density increase with connection of customers
  •  Acceleration of heating network replacement pace (from 0.5 to 6% / year), with use of modern materials and technologies


  • Update of boiler plant n°16 (main boiler unit), 50% increase of available capacity (up to 96 MW), shutdown of 6 boiler plants and transformation into substations
  • Renewal of networks (more than 50% in 7 years)
  • Reduction of primary energy (gas) consumption (MWh / DD) of more than 30%
  • Reduction of electricity consumption (kWh / Gcal produced) of 15%
  • Reduction of water losses (from 100 down to 20 m3 / h of 80%
  • Reduction of air pollutants (CO2 and SO2) following the shutdown of the depreciated heavy fuel oil boiler plant