Txantrea District project proposal


The EFIDISTRICT Energy Plant is situated on land which is direct accessible from the Ronda Norte road (PA-30) and shall function with over 70% of its thermal energy generated from local renewable energy, mainly forest biomass.

The use of forest biomass as fuel, in addition to the environmental advantages, shall enable us to enhance our energy dependency creating local jobs and wealth for all of the Provincial Community (70% of the Navarre woodlands are publicly owned).

The installation shall provide a 24 hour service for the production of hot water and shall have a large accumulation deposit, which shall enable the utilisation of the heat produced during the night (off-peak demand period).

In addition to heating and DHW services, cooling production and distribution is also proposed by means of a small network which shall enable the supply to health services and public services buildings, situated in the proximities of the production plant.
Phases: According to the study drafted by the AIN (Industry Association of Navarre) for the EFIDISTRICT Plant, the project is to be carried out in 2 phases, in such a way that both the building and the general installations will allow the upgrade of the energy production equipment in order to meet future demand.

PHASE 1: Production capacity of 16 MW

  • 12 MW by means of biomass equipment.
  • 4 MW by way of gas natural equipment.
  • Approximately 2,200 dwellings and 8 public buildings.

PHASE 2: Production capacity of up to 32 MW

  • 20 MW by means of biomass equipment.
  • 12 MW by way of gas natural equipment.

In total, with the Efidistrict Plant, heating and DHW services are proposed to supply over 4,500 residential dwellings and furthermore to an extensive number of public and services buildings.

Plan of the Production Plant according to the preliminary study of the EFIDISTRICT Heating Network


The primary circuit shall run under the streets in an underground trench for the transportation of the energy from the Production Plant to the stations and substations of the cooperatives and heating districts, as well as to the energy exchange points within the buildings.

For the transportation of the thermal energy pre-insulated pipes and conduits shall be used ( already thermally insulated from the factory) and will have a leak detection system installed. This system will enable the detection of any humidity which may represent a water leak from the inside of the network or seepage or filtrations from the outside of the system.

In the same trench, pipes and conduits shall be installed for the fibre optic cabling which shall enable the operating of both the network and the points of delivery of the energy to clients to be monitored from the Production Plant in real time.

The network shall function based upon the variable flow principle (pumping according to the thermal demand required) and constant volume principle (the water circulates in a closed circuit)

According to the study drafted by the AIN (Industry Association of Navarre), the size of the network during Phase 1 shall be that of 5.6 km which shall be extended by 3.6 km through the second phase until a circuit of over 9 km has been completed. The design of the network may vary or may even be extended depending upon the potential clients over the upcoming years.

Phase 1 according to the preliminary study of the EFIDISTRICT Heating Network