Resumé

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ENVIRONMENT-FRIENDLY DISTRICT HEATING TO THE GREATER COPENHAGEN AREA

The Metropolitan Copenhagen Heating Transmission Company, CTR for short, is a partnership formed in 1984 by the municipalities of Frederiksberg, Gentofte, Gladsaxe, Copenhagen and Taarnby.

CTR has the objective of supplying the individual recipient municipalities and local heat supply enterprises with district heating, primarily based on surplus heat from waste to energy plants and combined heat and power generation plants (CHP plants). Heating plants based on fossil fuels are used in peak-load and/or back-up situations.

CTR's assignments cover the purchase of heat from production units, heat generation in its own peak-load and back-up units, transport through the transmission system and sales to the five Partnership Municipalities, as well as the exchange of heat with Vestegnens Kraftvarmeselskab I/S (VEKS). Moreover, CTR is in charge of the planning, establishment, funding and further development of the entire transmission system. Finally, CTR participates as an associate by investing in and operating a geothermal facility and a test heat pump connected to the sewer from which facility heat is also received.

CTR is responsible for developing and operating the transmission system – a 54 km transmission network, 3 booster pump stations, 14 peak-load units and 27 heat-exchanger stations – from which the heat is transmitted to the local district heating systems in the partnership municipalities.

CTR's objective is to purchase, transport and supply district heating and in special situations to supplement this by production of heat from its own peak-load units. The heat is transported in a transmission system that is owned by CTR. Heat consumers in CTR's partnership municipalities – Frederiksberg, Gentofte, Gladsaxe, Copenhagen and Taarnby – meet their heating requirements through CTR via the utilization of excess heat from refuse incineration plants and CHP plants, etc.

Heat purchase, monitoring and delivery are managed from CTR's control room in Frederiksberg via an extended control, regulation and monitoring system.

CTR fills an important task in implementing the political strategy for a CO2 neutral capital in 2025. The important and necessary green transition from fossil fuels to biomass on the power plants include not only new technical solutions to be implemented but also complicated negotiation of new contracts with the power companies in order to find solutions that support the transition. Another and even more complicated task is to convert CTR’s own fossil fuel based peak and reserve units to a CO2 neutral production within a reasonable economical framework.

TECHNICAL FACTS AND FIGURES

Estimated gross annual demand for heat, 2018

18.531 TJ

Basic load capacity

1.037 MJ/s

Peak load capacity

855 MJ/s

Transmission network lengh, double pipes

54 km (34 miles)

Heat exchange systems (31) installed effect

1.944 MJ/s

Booster pump station (4) installed effect

7.245 kW

Maximum flow temperature

120°C (248°F)

Operating pressure

25 bar (350 psi)

Construction costs

3,1 mia. kr. (425 mio. US$)

Five years in Figures

  2015 2016 2017 2018 2019
           
Heat sale (TJ/year) 19.670 20.485 20.615    21.421 21.082
Of which:          
● Sales to partner municipalities 16.993 17.785 18.246    18.692 17.840
● Sales to VEKS 2.677 2.700 2.370      2.729 3.242
           
Heat purchase from partner municipalities 17.082 17.942 18.353 18.779 17.954
Of which:          
● Waste incineration 3.815 3.575 3.877 4.913 5.296
● Geotherma 10 34 11 3 0
● CHP 12.264 12.971 13.317 11.622 11.779
● Peak load 993 1.361 1.148 2.242 880
           
Heat loss (net loss and standstill heat) (TJ/year) 89 157 107 87 114
Water loss (m3/år) 85.180 40.360 63.157    97.378    49.797
Cooling (°C) 60 60 61 61 62
Electricity consumption (GWh) 70 74 75 81 81
Connected production capacity (MJ/s) 1.920 1.878 1.963 1.977 1.977
Of which           
● Base load 1.079 1.037 1.122 1.113 1.113
● Peak load 841 841 841 864 864
Maximum load (MJ/s) 1.456 1.519 1.649      1.701      1.401
Transmission system in operation (km)           54           54           54           54           54
Stations in operation, number           35           35           35           35           35
Number of CTR employees           30           32           32           32           34