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Compostilla CCS Project

Compostilla Fact Sheet: Carbon Dioxide Capture and Storage Project

Company/Alliance: ENDESA, CIUDEN, Foster Wheeler
Location: El Bierzo, NW Spain
Feedstock: Coal
Size: Phase 1: 30 MW (pilot) Phase 2: 323 MW (full scale demo)
Capture Technology: Oxy-Fuel (using Flexi-Burn CFB technology)
CO2 Fate:
Saline aquifers
Timing: Phase 1: (2009-2012) Phase 2: (2013-2015)

Motivation/Economics:Awarded €180 million from EU government in December 2009 as part of government economic recovery act to complete Phase 1. The project will also receive an extra €280-450 million in the form of EU Emission Allowances.

Comments: The project is also called OXY-CFB-500. This project is unique among those that have received funding from the EU in that it is the only one which is developing Oxy-fuel combustion.

Project Link: Compostilla Oxy-CFB-500 project website

Compostilla OXYCFB300 Project is co-financed by the European Union's European Energy Programme for Recovery. It's a Carbon Capture and Storage (CCS) integral commercial demonstration project, including CO2 capture, transport and storage. This project is one of the 6 similar projects funded under the European Energy Programme for Recovery.
The Project is based on a 300 MWe Circulating Fluidised Bed (CFB) supercritical oxycombustion plant, with CO2 storage in a deep saline formation. This technology will be tested first on a new 30 MWth Technology Development Plant (TDP) sited in Cubillos del Sil, close to ENDESA’s Compostilla Power Station in the Northwest of Spain, in which it will be scaled to demonstration size (300 MWe).
The Project has been divided into two distinct phases to significantly reduce the economic and technical risks of this cutting edge CCS demonstration Project:

  • Phase I. Technological Development (2009 - 2012)
  • Phase II. Demonstration (2013 - 2015)

The Project has two phases:


Phase I - Technology Development (2009 to 2012)

This phase includes the construction of three Technology Development Plants (TDPs) at pilot scale: CO2 capture, transport and storage TDPs. These activities will provide the project with valuable experience and technical support for Phase II.
The CO2 capture and transport TDPs are under construction in the vicinity of ENDESA’s Compostilla PS in Cubillos del Sil (Leon, Spain). The storage TDP is currently undergoing detailed geological characterisation. Its location is Hontomin (Burgos, Spain).
This phase also includes the survey and geological characterisation of a safe and suitable geological CO2 storage for all the demo plant lifetime, development of the Project FEED including the plant, pipeline and the injection infrastructure, the permitting process, and the associated engineering studies required to guarantee the successful delivery of Phase II.
By mid 2012, the Final Investment Decision (FID) process of the integrated Project will be started, based on the knowledge and results obtained from Phase I, and the final permitting, financial and economical boundary conditions of the Project allowing the Project to proceed to Phase II.

Phase II - Construction of the Demo Project Infrastructure (2013 - 2015)

Phase II includes the construction of a 300 MWe demo plant at the Compostilla site together with the corresponding CO2 transport and storage infrastructure.
The reason for adopting this staged approach to implementation (pilot-scale TDP followed by large-scale Demo Plant) is to significantly reduce the potential for economic and technical challenges that could arise during the Demo Plant phase of the Project.
The OXYCFB300 Compostilla Project has been selected by the European Energy Program for Recovery (EEPR) to receive funding of 180M&euro to complete the Phase I.



The OXYCFB300 Project will use oxycombustion technology based on Circulating Fluidised Bed (CFB) technology. The applied configuration (i.e. CFB boiler combined with oxy-combustion) has several advantages, such as the potential to use a wide range of fuel types, high combustion efficiency, and low NOx, SO2 and CO emissions.



In the Phase I of the OXYCFB300 Compostilla Project the captured CO2 will be transported via road tanks to the storage TDP in Hontomin (Burgos, Spain), and by an underground pipeline from the capture site at Compostilla Power Station to the industrial storage facility in the Phase II.
Both methods are commonly used by industry today. Transport by road using pressurised tanks is the usual way to transport gaseous products in the food and pharmaceutical industries.

Regarding CO2 pipelines, more than 3,000 km are already in operation worldwide for the oil industry. Experience since the 1970s has shown that CO2 transportation by pipeline is both safe and effective.




Geological CO2 storage involves the injection of compressed CO2 into a deep and porous geological formations more than 800 metres underground (the reservoir), which are sealed by a rock layer of very low permeability (the cap). Due to the high pressure at this depth the CO2 is in a liquid-like fluid state, which occupying a volume which is some 500 times smaller than on surface. Several formations can be used as reservoirs; CO2 can be injected into depleted oil and gas reservoirs, deep saline formations or coal beds. Once injected, the CO2 occupies the pore spaces of the rock where it remains trapped by different physical and chemical mechanisms.

The target reservoir formations for the OXYCFB300 Project are deep saline formations in Mesozoic sedimentary sequences that are covered by very low permeability formations that act as an efficient cap.
At the storage TDP located in Hontomin (Burgos), less than 100,000 tonnes of CO2 will be injected into a 1,500m deep dome-like saline formation over a period of 5 years.