Minimum price and legal frame
At both federal level and the levels of the three Belgian regions (Brussels-Capital Region, Flanders and Wallonia), schemes have been developed requiring transmission system operators to purchase green energy certificates or Combined Heat and Power Certificates (CHPCs) at a guaranteed minimum price.
Elia, as the transmission system operator or as the operator of the local transmission system, performs these public service obligations and therefore is obliged to purchase green certificates and CHPCs awarded by the various Belgian regulators from any renewable energy generator requesting this.
"In its capacity of transmission system operator, Elia is required to buy back green certificates from generators of renewable energy in Belgium. Offshore wind farms, photovoltaic facilities commissioned before 1 August 2012 and facilities that use water or tidal energy to generate electricity are entitled to receive this support. This federal support mechanism is valid for 10 years after the facility is commissioned, and green certificates are issued by CREG (Commission for Electricity and Gas Regulation), VREG (Flemish Electricity and Gas Regulatory Body), CWaPE (Wallonia Energy Commission) and BRUGEL (Brussels Energy Regulatory Body)."
Source: Royal Decree of 21 December 2012 amending the Royal Decree of 16 July 2002 on the Introduction of Mechanisms Promoting Renewable Electricity Generation
The guaranteed minimum prices are mentioned in article 14 of the Royal Decree of 16 July 2002 on the Introduction of Mechanisms Promoting Renewable Electricity Generation
Support in Flanders
Grid operators must buy the green certificates from generators connected to their grid or to the closed distribution systems connected to their grid, if the generator requests this. This means that Elia in its capacity of operator of the local power transmission system must apply the Flemish minimum support to generation facilities connected to the local 70-kV to 30-kV transmission system in the Flemish Region. The minimum support that is laid down depends on the energy source and generation technology that are used and the date of commissioning. The date of commissioning also determines how long this support is provided.
Source: Article 7.1.6 of the Law Establishing General Conditions for Energy Policy (Energy Law)
More information is available on the website of VREG on https://www.vreg.be/nl/minimumprijs-voor-steuncertificaten
Support in Wallonia
Each renewable-energy or combined heat and power (CHP) generator can sell to the operator of the local transmission system, directly at a guaranteed minimum price, some or all of the green certificates awarded to them.
The price of the green certificates which the local transmission system operator is required to buy is set at €65 (Decree of the Walloon Government of 20 December 2007, Article 35).
Source: Article 40 of the Decree on the Organisation of the Electricity Market and Article 24quinquies of the Decree of the Walloon Government of 30 November 2006 on Support for Renewable Energy and Combined Heat and Power Generation.
More information is available on the website of CWaPE on https://www.cwape.be/?lg=1&dir=3.5
Support in Brussels
The same support as in Wallonia, but of course the legal basis is different.
Source: Article 28 of the Ordinance on the Organisation of the Electricity Market in the Brussels-Capital Region.
More information is available on the website of BRUGEL on https://www.brugel.brussels/acces_rapide/energies-renouvelables-11/vendre-les-certificats-verts-38