Environmental management


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2015 milestones
  • Approval of the Health & Safety, Environment and Quality Policy. 
  • Renewal of the Environmental Management System certificate in accordance with ISO14001. 
  • Renewal of the Barcelona and Huelva plants' EMAS certificate. 
  • Creation of a Paperless Programme Office that drives and coordinates the company's transformation towards a more efficient and sustainable model.
Lines of progress 2016 
  • Development of corporate directives regarding biodiversity. 
  • Extension of the ISO14001 certification to head office (Enagás, S.A. and Enagás GTS) as well as the EMAS certification. 
  • Reduction of BOD and COD levels in the sanitary water discharged by the Yela Storage Facility or installation of a sealed reservoir. 
  • Implementation of noise reduction measures for Regulation and Metering Stations, the Gaviota Storage Facility and the Cartagena Plant.
  • Reduction in the use of municipal water at the Barcelona Plant and reduced use of water at the Seville and Paterna compressor stations to match the average levels of consumption at all other stations.

97% of activity certified with ISO 14001.

3,823 tonnes of waste generated.

91,818 m3 of water consumption.

14 tones of SOx.

1,192 tonnes of NOx.

45 tonnes of CO.

Environmental management

Enagás undertakes its environmental commitments (as reflected in the Health & Safety, Environment and Quality Policy) through the Environmental Management System. 97% of Enagás' activity is certified in accordance with ISO 14001. In addition, the Huelva and Barcelona regasification plants have the EMAS certification. In 2016 we will continue to extend the scope of both certifications. Specifically, the company's head office will be included in the ISO 14001 certification.

AENOR. Gestión ambiental.



Enagás is invested in implementing new ways of working that are more efficient and sustainable. Along these lines, the Paperless project is aimed at optimizing work flows and reducing the use of paper. In 2015, the Paperless Programme Office was set up to raise awareness among employees and promote specific measures that allow document digitisation, process automation or replacement of physical formats by electronic formats. 

The office is tasked with: 

  • Disseminating a paperless culture throughout the organisation.
  • Prioritising initiatives to be included in the Transformation Programme. 
  • Promoting initiatives while ensuring the fulfilment of targets and acting upon undesired deviations. 
  • Regularly reporting on the goals and milestones achieved.
Impact studies and assessment of environmental issues

Enagás studies the environmental impact of all its construction, operation and maintenance activities by means of environmental assessments. What is more, for infrastructure construction projects, and based on their type and on applicable regulations, environmental impact studies are carried out which include both the impacts themselves and the measures taken to mitigate them, while also establishing stakeholder consultation procedures. 

Environmental monitoring is carried out through environmental audits of works, environmental surveillance, assessments of legal compliance in all installations and monitoring of environmental indicators and improvement plans.


Environmental mailbox, Corporate website, Informative Sessions and Consultation processes.

On-site environmental audits carried out on 3 km of pipelines in Spain and on 160 km. Environmental monitoring carried out on 586 km of pipelines.

Biodiversity protection

During the development of infrastructures, Enagás carries out activities aimed at protecting and preserving flora and fauna, thereby mitigating any impact on biodiversity. Such activities start with on-site reconnaissance before any work commences in order to check for the presence/absence of species along the route.

Impacts on biodiversity are greater in areas where Enagás is developing and participating in infrastructure construction projects, as is the case in Mexico. We have therefore extended the scope of the information provided in this chapter. 

The biodiversity protection measures carried out in 2015 construction projects are set out below:

Biodiversity protection measuresMorelos pipelineSoto La Marina Compressor Station (50% stake owned by Enagás)Euskadour Compression PointGranada by-passCoria del Río by-passImpacts on biodiversity
Replanting by sowing grasses and planting trees and shrubs compatible with the affected landXNot applicable

5,786 m2 (€34,273 investment)

Not applicable

32 m2 (€985 investment)(1)

Reduction of the impact on vegetation of opening up pipeline routes
Use of narrower work tracksXNot applicableXNot applicableNot applicable
Transfer of specimens to similar habitats nearbyXXNot applicableNot applicableNot applicable
Use of corridors belonging to other existing infrastructure and existing access routes to work sitesXXXXXReduction of the impact on soil due to earth movement and water due to crossing waterways
Targeted drillingNot applicableNot applicableNot applicableNot applicableNot applicable
Recovery of waterway banks and soil by means of soil loosening, topsoil replacement and reconstruction of boundariesXNot applicable

12,988 m2 (€34,273 investment)

Not applicable32 m2
Use of modified routesXNot applicableXNot applicableNot applicable
Adjustment of the work schedule to the nesting and breeding season of certain speciesNot applicableNot applicableNot applicableNot applicableNot applicableReduction of the impact on fauna

(1) Includes the recovery of waterway banks and soil by means of soil loosening, topsoil replacement and reconstruction of boundaries.


Before commencing construction of the compressor station, Enagás carried out on-site reconnaissance to survey the flora and fauna. The purpose is to detect the presence of any endangered species. The impact of the works on the local flora and fauna was deemed ‘Non-Significant’. 

The environmental aspects deemed most significant in the project's Environmental Impact Study and Environmental Impact Statement included the creation of screens of trees around the facilities. 

A total of 0.37 hectares were replanted through two main types of actions which were applied jointly: 

  • 0.32 hectares of slopes in clearing or embankment were seeded or hydroseeded to encourage revegetation and reduce the risk of erosion. 
  • 0.20 hectares were repopulated with bushes and trees, whether as a vegetation shield around the compression point or as riverside thickets. 

Revegetation of the course of the underground power line was carried out without planting tall trees and bushes along the 4-metre strip on the easement of the power line. 

A total of 927 species were planted, with 369 protectors and 891 supports. Seeding and hydroseeding provided the terrain with 81 kg of grass seeds. 

This restoration also aims to improve the stability of the civil works (embankments and clearing) and reduce the maintenance costs thereof.

Investee companies
Actions to protect biodiversity carried out during construction of the Morelos pipeline

Flora and fauna rescue programmes for the Morelos pipeline enabled 1,671 species of flora to be rescued through continuous transplantation, as well as 198 species of fauna through capture and release. The species of fauna that were rescued included 35 endangered species (pigmy rattlesnake, neotropical whip snake and horned lizard). The flora that was rescued did not include any protected species. Investment in both programmes amounted to €41,764. 

Other biodiversity protection measures were also carried out, such as the use of narrower work tracks, corridors belonging to other existing infrastructure and existing access routes to work sites, recovery of the banks of water courses and soil through soil loosening, replacing topsoil, reconstructing boundary areas and the use of modified routes. 

Lastly, in order to monitor environmental protection in the area as well as the workers' health, a series of environmental awareness campaigns were carried out. These campaigns consisted in presenting the main species of flora and fauna to be protected and training to distinguish venomous snakes that probably inhabit the work area by giving the workers information leaflets.

Water management

At Enagás, we withdraw seawater for use in floodwater and seawater evaporators at regasification plants. This water is returned under the same conditions as those in which it is withdrawn (the temperature decrease is minimal and it does not affect the marine ecosystem). The volume of water taken is directly proportional to the quantity of gas regasified.

At Enagás, we do not consume water in our production processes. We do, however, use water for sanitation, irrigation and firefighting.

The wastewater discharged by Enagás is comparable to urban waste. In 2015, we discharged 5,878 m3 of water into the public mains and 8,255 m3 of water into septic tanks or the sea.

Seawater withdrawn and returned to its source (hm3)

Seawater withdrawn and returned to its source (hm3).

Water consumption by source (m3)

Water consumption by source (m3).

Spillage and waste control

With regard to spillage, the company carries out preventive measures such as dual-wall underground tanks, which are inspected regularly to ensure that they are watertight, and the placement of containment troughs and trays.

Accidental spillage in 2015 was:

  • 122 litres of gasoil 
  • 397 litres of oils 
  • 17.7 litres of THT 
  • 100 litres of water with oil 
  • 300 litres of water with salt 
  • 100 litres of water with metanol

Corrective actions include damage assessment, land decontamination and replenishment, removal and treatment by the waste manager and preparation of the incident report.

Enagás mainly generates waste through facility and equipment maintenance. The company's objective is to recycle and recover this waste wherever possible.

Waste generated (t)

Waste generated (t). In 2013: 3,455 tonnes. In 2014: 2,189 tonnes. In 2015: 3,823 tonnes.

Noise control

Enagás conducts annual noise measurement campaigns at its facilities in order to minimise noise pollution. In 2015, we conducted 55 measurements and checked compliance with the legal limits applicable in all but four facilities. Since 2009, the company has installed silencers and acoustic panels in some of its facilities.

In 2016, we will be working to reduce ambient noise levels at the Gaviota Storage Facility and the Cartagena Plant. We will also be implementing noise reduction measures for the Regulation and Metering Stations identified and studied in 2015.

Atmospheric emission control

The main non-GHG emissions at our facilities are CO, SOx and NOx. There are also emissions of less significant gases.

Non-GHG emissions (t)

Non-GHG emissions (t).

Enagás carries out regulatory and voluntary checks (self-checking) at all its combustion sites.

See the ‘Environmental management’ section on the corporate website.