Creating economic, social and environmental value

Climate change and energy efficiency

Milestones 2016
  • Setting a target for reducing CO2 emissions by 30% in 2016–2018 compared to the previous three years, included in the multi-annual remuneration for all employees.
  • Setting company objectives for 2016 linked to energy use (natural gas and electricity), power generation from own clean resources and reduction of fugitive emissions.
  • Implementation of the 2016 Enagás Energy Efficiency and Emissions Reduction Plan with 8 studies and 30 energy-saving measures identified.
  • Recognition by CDP of leadership in climate change action (joining the CDP Climate A List).
  • Registration with the Carbon Footprint, Compensation and Carbon Dioxide Absorption Project Registry of the Spanish Ministry of Agriculture and Fisheries, Food and Environment, with the obtention of ‘calculation’ status for 2013, 2014 and 2015.
  • Membership of the Action Exchange Initiative of the CDP Supply Chain programme for the promotion of energy efficiency and greenhouse gas emissions reduction among our suppliers. 
  • Obtention of Green Fleet certification (Master level) awardedby AEGFA and IDAE.
Lines of progress 2017
  • Approval of corporate directives regarding climate change and energy efficiency. 
  • Implementation of the 2017 Enagás Energy Efficiency and Emissions Reduction Plan.
  • Energy management system certification according to the ISO 50001 standard.
  • Voluntary carbon offsetting.

Our approach to climate change management is based on public commitment, emission reduction measures and the reporting of our performance and results, as well as the extending of our commitment to our supply chain.

At Enagás we have taken on a public commitment by joining the WE MEAN BUSINESS initiative to leverage the opportunities for economic growth, employment and prosperity offered by the transition towards a low-carbon economy.

Our commitments include:

  • Reporting information on climate change through our Carbon Footprint verified in accordance with the ISO 14064 standard, the Annual Report and the response to CDP. What is more, we incorporate specific information on climate change in our communications to investors. 
  • Setting a carbon price for the 2015-2020 period, in order to fully incorporate environmental externalities into our business and investment decisions.
  • The promotion of policies towards a low-carbon economy by taking part in different platforms, associations and forums.

In addition, Enagás has joined the Action Exchange Initiative of the CDP Supply Chain Programme for the promotion of energy efficiency and greenhouse gas emissions reduction among our suppliers.

Enagás is committed to the use of gas as the least polluting fossil fuel and, therefore, key to the power generation mix for meeting emission reduction targets and allowing the development of more efficient renewable energies; as well as replacing other fossil fuels as we move towards more sustainable mobility in sea, rail and road transport.

Participation in different platforms, associations and forums 

Enagás is involved in different platforms, associations or forums such as the International Gas Union, Marcogaz, GASNAM, (Iberian Association For Gas-Powered Mobility), the Spanish CO2 Platform or the GECV (Spanish Group for Green Growth), in order to promote policies that favour the replacing of highly polluting fossil fuels by natural gas for the transformation towards a low-carbon economy. Enagás also takes part in international forums such as the International Energy Forum, Atlantic Energy Forum, FUNSEAM (Foundation for Energy and Environmental Sustainability), Oxford Institute for Energy Studies, etc., and is a founding member of GIE (Gas Infrastructure Europe) and ENTSO-G (European Network of TSOs - Gas) within the framework of the European Union, in order to strengthen this position.

Promoting the use of  natural gas as a fuel

Enagás is coordinating the CORE LNGas hive project for the development of infrastructures in Spain and Portugal that support the use of Liquefied Natural Gas (LNG) as an alternative fuel in sea (bunkering), rail and road transport. This initiative enjoyed collaboration from universities, port authorities, energy companies, etc. and is aligned with the implementation of Directive 2014/94 on the development of alternative fuels and Directive 2012/33 on reducing the sulphur content of fuel for maritime use.

Furthermore, the company is promoting the use of liquefied natural gas as an alternative to petroleum for heavy vehicles.

Promoting the use of  biogas as a fuel

Enagás is also promoting the use of biogas both in Spain and beyond. This fuel is complementary to natural gas in certain applications, such as industrial usage and the transport sector. Connecting biogas supply points to the gas network is both environmentally and economically beneficial. 

Enagás, through its stake in the Swedish TSO Swedegas, promotes the development of biogas in Sweden, which is a world leader in biogas production. Through Swedegas, Enagás is working with various biogas producers to connect their facilities to the gas transmission network, thereby providing them with an environmentally optimal way to transmit the product to the end user.

Enagás monitors its emissions, energy saving targets and the company’s emissions reductions on a monthly basis. Furthermore, each year the company verifies its Carbon Footprint in accordance with the ISO 14064 standard, with a reasonable level of assurance. 

In 2016 Enagás registered its carbon footprint in the Carbon Footprint, Compensation and Carbon Dioxide Absorption Project Registry of the Spanish Ministry of Agriculture and Fisheries, Food and Environment, with obtention of ‘calculation’ status for 2013, 2014 and 2015.




See Carbon Footprint
on the corporate website

Evolution of scope 1 and 2 emissions 

Enagás reduced its carbon footprint by 5% compared to 2015. This reduction was mainly due to the reduction in emissions at regasification plants, partially the result of the major energy efficiency and emissions reduction efforts made by the company at these facilities in recent years. The implementation of technical and operational measures have allowed the boil-off gas produced during normal plant operations and at lower production levels to be recovered, which would otherwise have been dealt with by flaring. The further reduction in tanker loading activities has led to the reduction of gas flaring during these types of operation to zero. As a consequence, emissions from natural gas flaring at regasification plants were reduced by 83% in 2016 compared to the previous year.

However,the move to a market-based methodology for calculating emissions produced by electricity consumption has allowed the calculation of these emissions to be adjusted with the use of emission factors from distributors instead of the factor from the national energy mix. 

Evolution of Scope 1 and 2 emissions (tCO2e) 

Evolution of Scope 1 and 2 emissions(1) The reduction in electricity consumption was mainly due to a shift in methodology, encouraged by leading climate change entities, which consisted of a change in approach from location-based accounting system, whose emission factor took into account the national energy mix, to a market-based one which takes into account the specific emission factors of its shippers.

Scope 1 and 2 emissions by source type and gas type

Approximately 67% of the Enagás carbon footprint corresponds to emissions of CO2, mainly produced during the combustion of natural gas in stationary sources, i.e. turbocompressors, boilers, flares, etc.

Emissions of CH4, which account for approximately 32% of this footprint, are mainly due to fugitive emissions (22%) and natural gas venting (10%). Venting may occur as a result of operation and maintenance, operating safety, pneumatic valves and analysis equipment (chromatographs, etc.)

Refrigerant gases (HFCs) are practically insignificant alongside the other two gases.

Most of the Enagás greenhouse gas emissions in 2016 originated from natural gas use in turbocompressors.

Scope 1 and 2 emissions by source type
 Scope 1 and 2 emissions by source type

(1) Including HFCs, flares, vehicle fleet, vaporisers, HVAC and natural gas-powered standby generators, and diesel-powered generators and fire protection pumps.



Scope 1 and 2 emissions by gas type (tCO2e/year)Emisiones de alcances 1 y 2 por tipo de gas (tCO2e/año)
Emission intensity (scopes 1 and 2) 

The emission intensity indicators improved with regard to the previous year owing to the greater effect that the 5% Carbon Footprint reduction compared to the indicators of turnover (1% increase), employee numbers (constant in 2016) and gas output (2% reduction).





Intensity of emissions per employee (tCO2e/employee)




Intensity of emissions by turnover (CO2e/€m)




Intensity of emissions by gas output (tCO2e/GWh)




Emission rights trading strategy

48% of emissions included in Carbon Footprint scopes 1 and 2 are included in the EU Emissions Trading System (EU ETS).

The Enagás emission rights trading strategy approved by the Board of Directors identified the need to purchase approximately 100,000 rights until 2020. 

Scope 3 emissions

In 2016, and for the third year running, we took part in the CDP Supply Chain initiative, inviting our main suppliers to report on their climate change targets and performance. As in the previous years, the information obtained was included in our inventory of scope 3 emissions

See la Carbon Footprint 2016
on the corporate website

Scope 3

Acquisition of goods and services

Emissions derived from the extraction, fabrication and transport of acquired goods and services.

127 tCO2e

Emissions arising from the use of paper and office materials.

25 tCO2e

Capital Goods

Emissions derived from the extraction, fabrication and transport of equipment acquired for production.

93 tCO2e

Activities related to energy production (not included in scopes 1 or 2)

Emissions due to the extraction, production and transport of fuel consumed directly by Enagás: natural gas.

21 tCO2e

Upstream transmission and distribution

Emissions generated by the consumption of fuels derived from helicopter and ship transport services (from the plant to the platform of the Gaviota underground storage facility). 

1,427 tCO2e

Waste generated during operation

Emissions derived from the transport, management and treatment of waste generated at Enagás facilities.

89 tCO2e

6. Work-related journeys

Emissions derived from work-related journeys by Enagás employees (aeroplane, train and taxi).

2,060 tCO2e

Journeys to and from work by employees 

Emissions derived from journeys to and from work by Enagás employees.

1,002 tCO2e

15. Investments

Emissions, excluded Scopes 1 and 2, from those companies in which Enagás has a stake but not financial control. In this case, the verified 2015 emissions were included from these companies: Bahía de Bizkaia Gas, S.L, Compañía Operadora de Gas del Amazonas, S.A.C. (COGA), GNL Quintero S.A., Sagunto S.A. Regasification Plant (Saggas), Terminal de LNG de Altamira, S. de R.L. de C.V

106,173 tCO2e



111,015 tCO2e

For the last 5 years, Enagás has set annual energy intensity targets at each of its facilities, which it also links to employees' variable remuneration.

In addition, the company has set long-term goals, such as cutting emissions by 30% over the 2016–2018 period compared to 2013–2015, which has been included in long-term variable remuneration.

The reduction in the 2016 Carbon Footprint is an important advance towards this goal, which is already at 38% of being met.

The company has also set a long-term target for the self-generation of 35% of its own electrical energy requirements from clean sources by 2020.

Enagás has also made progress in this respect. It has incorporated a clause referring to guarantees of origin in its contracts, which contains a provision to deliver 25% of the electricity consumed by its regasification plants in Barcelona, Cartagena and Huelva, and 100% of that used by its R&D laboratory in Zaragoza with a Guarantee of Origin (GO). This increases the amount of electricity procured from the grid from renewable sources and with a zero emission factor, which in 2016 accounted for 20% of the electricity for consumption sourced from the Spanish power grid.

Self-generated electricity from renewable, clean or efficient sources in 2016 accounted for 12.5% of total consumption (20 GWh), with part of this electricity delivered to the national grid and the other part used at Enagás facilities. Investment in self-generation in 2016 amounted to €880,000.

At Enagás, energy efficiency has a key role in emissions reduction and considerable efforts have been made in this regard. The energy efficiency measures implemented in 2016 were able to prevent the emission of 92,224 tCO2e into the atmosphere.  

Natural gas savings of 464 GWh were achieved mainly through the installation of end-of-pipeline gas compressors that allow the recovery and reinjection of boil-off gas generated during operating situations at low-level production stages at the Cartagena and Huelva regasification plants. Both actions meant an investment of almost €23M. The total cost of energy efficiency measures put into place in 2016 came to €25.5M

Energy consumption (GWh/year)

Energy efficiency emissions reduction

(*) 2014 and 2015 figures were adjusted based on the actual higher calorific value (HCV) of the gas transported by Enagás in those years.

(**) Previous Annual Reports only reported the consumption of electricity sourced from the grid. This report replaces that concept with that of total electricity consumption (both from the grid and self-generated).

Energy intensity (MWh natural gas consumed/GWh national demand)(*) 

(*) 2014 and 2015 figures were recalculated taking into account the new adjusted figures for natural gas consumption.


The energy efficiency measures implemented in 2016, along with the corresponding savings, are set out below: 


Actions aimed at reducing GHG emissions
(Energy Efficiency Measures)


Energy savings
achieved in 2016

Emission reductions achieved in 2016

Installation of end-of-pipeline gas compressors that allow the recovery and reinjection of boil-off gas to the basic gas pipeline in situations where operations were below the technical minimum at the Cartagena and Huelva regasification plants.

373.5 GWhNG

(although this involves an associated consumption of 7.0 GWhelec)

72,733 tCO2e

Diversion of the tanker Dukhan from the Huelva plant to the Cartagena plant (EOC 6 March 2016).

81.7 GWhNG

16,509 tCO2e

Upgrading TC2 compressor at the Almendralejo CS.

4.8 GWhNG

961 tCO2e

Use of nitrogen instead of natural gas in the flare molecular seal (CB 101) on the Huelva Regasification Plant jetty.

2.7 GWhNG

537 tCO2e

Regulation of the pressure in flare pilot burners at the Cartagena and Barcelona regasification plants, achieving the corresponding savings in natural gas.

0.1 GWhNG

17 tCO2e

Replacement of the pneumo-hydraulic actuators with electric actuators in positions 1–13 Guitiriz and 1–15 Abegondo.

0.5 GWhNG

864 tCO2e

Optimisation of RMS control loops in order to reduce the outlet gas temperature and adjustments to the water recirculation pumping system in the heating circuit (pilot tests at five facilities).

0.8 GWhNG
0.9 GWhelec

195 tCO2e

Installation of variable frequency drivers on primary LNG pumps (P3001A and P3000B) at the Barcelona regasification plant.

0.4 GWhelec

153 tCO2e

Detection and repair of compressed air and nitrogen leaks at the Cartagena and Huelva regasification plants.

0.1 GWhelec

43 tCO2e

Modification of operations in order to exploit the connection between the impulse and return ducts of the seawater circuit at the Cartagena plant.

0.4 GWhelec

176 tCO2e

Installation of a trigeneration plant in Zaragoza and a microgeneration unit in Ágreda.

0.4 GWhelec
(although this involves an associated consumption of 0.6 GWhGN)

36 tCO2e



92,224 tCO2e

Sustainable mobility 

One of the Enagás strategic priorities is to encourage the substitution of more polluting fossil fuels with natural gas, contributing to reduce emissions in the transport sector. 

Thus, the company’s Sustainable Mobility Plan includes different initiatives to foster the use of natural gas-powered vehicles (compressed natural gas, CNG) and optimise travel arrangements in order to reduce environmental impact:

  • The launch of a plan for employees in which the company subsides the purchase of a new natural gas vehicle and provide loan guarantees.
  • The purchase of gas natural vehicles for the company fleet of vehicles for maintenance and executives.
  • Obtention of Green Fleet certification from AEGFA and IDAE, which recognises that the Enagás fleet meets strict environmental respect and sustainability standards, having obtained the certification at Master level, which is the most stringent.
  • The installation of CNG filling stations at company facilities, such as the pilot programme the Paterna facility, to supply natural gas to the Enagás fleet vehicles.

The company is also working on the launch of a car sharing initiative at the company head office, which will allow employees to share their vehicles for the commute between home and work. 

Reduction of fugitive methane emissions 

Fugitive emissions account for 22% of the company’s Carbon Footprint.

Enagás has implemented a programme to reduce fugitive emissions, with the goal of detecting and repairing natural gas leaks in the network. These emissions were reduced in 2016 by 8% compared to the previous year as a result of the repair work carried out on components with leaks in the course of 2015.

These components were identified during the 2013–2015 detection and quantification campaign carried out by an external ENAC-certified company according to the ISO 17025 standard, and utilising a hybrid method based on the detection of a leak with an infrared camera and subsequent measurement with a portable FID device according to the UNE-EN 15446 standard. The process of repairing leaks was finished in 2016, and the results of the final actions are reflected in the 2017 Carbon Footprint. In addition, Enagás has put forward a new challenge for 2017, consisting of the quantification and minimisation of these uncontrolled methane emissions through the planning of a new campaign to be included within the maintenance schedules for the different facilities and which will be conducted regularly and continuously.

By applying the company’s risk management model (see the 'Risk Management' section), Enagás has identified the following risks related to climate change:

Type of risk


Mitigation measures







Risk derived from regulatory changes




International agreements aimed at the development of zero-emission energy sources, particularly renewable ones, which may impact the demand for natural gas.

  • Promotion of new uses for natural gas to substitute more polluting fossil fuels (see the 'Promotion of policies towards a low-carbon economy' section).
  • Promotion of natural gas as a support for the development of more competitive renewable energies.



Increased costs associated with compliance with laws governing CO2 emissions.

  • Setting the target of 30% reduction in emissions for 2016–2018, linked to variable employee remuneration.
  • Energy efficiency and emissions reduction plan (see the chapter on 'Energy efficiency and emissions reduction').
  • Setting a carbon price for the 2015–2020 period, in order to fully incorporate environmental externalities into our business and investment decisions.
  • Carbon offsetting programme.



Risk derived from physical parameters

Unpredictable weather patterns, with fluctuations in temperature extremes that could cause catastrophic natural disasters, such as flooding, and therefore impact natural gas demand.

  • Environmental certification
  • (ISO 14001 and EMAS)
  • Emergency response action plans.
  • Procedures for investigation and monitoring of incidents.
  • Development of natural gas demand and peak demand scenarios that determine the infrastructure to develop in order to guarantee secure supply.
  • Policies regarding catastrophic material damage, such as that caused by flooding, earthquakes, volcanic eruptions, tropical cyclones, etc). 
  • Emergency response action plan for the Spanish Gas System.
  • Insurance policy covering catastrophic damage.