The facilities

The facilities- The Plant

Access control


After scanning and weighting trucks loaded with MSW, vehicles proceed to the receival hall access door.

Control room


Monitoring, control and information systems related to the various energy recovery, gas scrubbing and electricity production equipments of the facility are located in this room.

Ammonia tank


This tank is used to store the 23% ammonia solution which is injected into the furnace to neutralise nitrogen oxides.

Holding pit


The waste deposited in the pit is mixed in order to ensure homogeneity.



Heat released from combustion of municipal waste on the grate rack is used to produce steam in the boiler.

Bag house filter


After the initial gas scrubbing in the furnace-boiler and absorption tower, the remaining particles in the gases are filtered and collected for subsequent inertisation.

Absorption towers


The gases from the furnace-boiler are scrubbed to neutralise adidity and remove heavy metals and newly formed dioxins and furans.

Ash output


Fly ash and flue gas scrubbing residues from the furnace-boiler, absorption tower and bag filters are first stored in a silo before being conveyed to an inersitation plant in sealed trucks.

Slag and scrap storage and output


After the combustion process, the slag and scrap are deposited in two small storage pits. Subsequently, the slag is transported to a landfill, and the scrap is transported to a steelworks for recycling.



The chimney is a seventy-metre high cyllindrical structure that houses both the incineration line and energy recovery boiler gas evacuation ducts.

Emission control


Sensors that continuously sample the scrubbled gases to be monitored and controlled are located on a platform halfway up the stack.

Heat recovery boiler


Steam from the furnace-boiler at a temperature of 310 ºC is superheated to 540 ºC by the exhaust gases from the gas turbine.

Gas turbine


The turbine is used, on one hand, for the combustion of natural gas and consequent generation of electric power and, on the other hand, harness exhaust gases to provide the necessary heat to the recovery boiler, which overheats the steam produced in the furnace.

Steam turbine


The turbine converts the steam generated in the furnace-boiler and the heat recovery boiler to produce electricity.

RMS Gas supply regulation and metering station


The natural gas supplied to the plant is herein conditioned to meet the gas turbine’s pressure needs.

Electrical complex


Includes the transformers connected to the gas and steam turbines and to the substation itself, and the appropiate protective devices.

Water treatment plant


Conditions the water from the Kadagua river.

Cooling towers


The steam that was produced in the boiler and used in the turbine to produce electricity is here cooled and condensed.

Water tank


Storage facility for water previously conditioned in the treatment plant.

Tipping hall Access control Control room Ammonia tank Holding pit Furnace-Boiler Bag house filter Absorption towers Ash output Slag and scrap storage and output Emission control< Chimney Heat recovery boiler Gas turbine Steam turbine RMS Electrical complex Water treatment plant Cooling towers Water tank

The urban waste reception area and the radioactive materials detection gate are located at the entrance to the industrial facilities. There are two weighbridges, one for trucks delivering the urban waste authorised by the Basque Government Environmental Authority to be deposited at the unloading bay, and the other for vehicles leaving the plant.

The office building is opposite the entrance. The largest part of the plant is located on higher ground behind the offices, which in a row contains the following facilities: the waste reception bay, the holding pit, the control room, the furnace-boiler, the gas scrubbing system, and the power generation facility.

Parallel to this area is the site where the second waste-to-energy facility, or “PLANT B”, is scheduled to be built. This area is surrounded by the cooling towers, the water treatment plant, the electrical substation, and the regulating and metering station (RMS) for the natural gas supply.

In addition to gardens, there is an internal road network beginning at the plant’s entrance and servicing each one of its sections.