European Residual Mix Calculation

Grexel is responsible for calculating the European Residual Mixes and the European Attribute Mix on behalf of the Association of Issuing Bodies (AIB).  

Why is this so crucial for reliable Electricity Disclosure and Guarantees of Origin?

GECCO™ - Your Platform for Efficient Carbon Credit Management

Deposit and manage credits from EU ETS

Case: Ireland - In Need of an Efficient Online Registry for GOs

Ireland is a good example of how CMO.grexel online registry helps issuing bodies and local energy authorities to manage their energy certificates with efficiency, transparency and, let’s not forget, low cost.

Grexel discloses and compensates its Carbon Footprint

Being an environmentally aware company, Grexel® has decided to disclose and compensate its own carbon footprint.

Norwegian Central Registry, NECS

The Grexel-built Norwegian Energy Certificate System, NECS, is the first certificate registry supporting internationally connected disclosure and support certificate schemes.

Energy Certification in Egypt - Thriving in Turmoil

To support the rising trend of renewable energy projects in Egypt, the consumer protection regulatory agency, ERA, seeked Grexel's assistance in designing a guarantee of origin system compatible with the European markets.



Our Services

Regulatory and Market Engineering Services
How can we optimize the effectiveness of support schemes and empower consumers to be the driving factor behind green economy?
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Energy Certificates for Beginners »

Central Registry Systems Services
Need a central registry system to set up a trading scheme for environmental commodities or rights, such as Guarantees of Origin? See what the market leader has to offer.
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Our Clients

We host a central registry (CMO.grexel) for Guarantees of Origin for Croatia, Denmark, Hungary, Iceland, Ireland, Luxembourg and Sweden.
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We power a central registry for support certificates for Norway (NECS) and Sweden (Cesar).
It is the world’s first certificate-based joint support scheme between two countries!
Login to NECS» / Login to Cesar»

We also provide a central registry (GGT) for the Biomethane Certification Scheme in the UK


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ISO/IEC 27001
Grexel is now certified with ISO27001 Information Security Management Standard! It was a lot of hard work but worth it!
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Czech and Portuguese registries were disconnected from the AIB HUB
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Grexel is responsible for calculating the European Residual Mixes for AIB
Why is this so crucial for reliable Electricity Disclosure and Guarantees of Origin?
Read More»

Scientific Contributions

Grexel is active in the energy certification field. We are involved in its development, also from a non-business perspective.
Read More»

Market Data

  2016 2015
Norway 19 579 557 134 685 137
Croatia 3 707 68 378
Denmark 2 093 653 17 794 672
Finland - Grexel
Germany - Öko
Iceland 2 141 826 6 448 067
Ireland 346 126 1 975 400
Luxembourg 25 182 134 463
Sweden 8 631 883 28 901 715

More Statistics

CMO.grexel reports
EECS Market data from Denmark, Finland, Germany, Iceland, Luxembourg and Sweden

NECS GO reports
EECS market data from Norway

Cesar GO reports
Swedish national GO market reports

NECS Elcertificate reports
Norwegian support certificate market reports

Cesar Elcertificate reports
Swedish support certificate market reports

AIB Statistics
EECS certificate market information

Grexel® is a registered EU trade mark

Partners & Industry Recognition




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