Grid Code Compliance & Testing

Units that are controlled by EirGrid are required to comply with technical rules in the Grid Code. When a unit connects for the first time, makes changes or returns from maintenance, they test the performance of the unit. These tests are witnessed by EirGrid. The test results are compared to the rules in the Grid Code.

If a unit passes the tests, EirGrid issues a certificate allowing the unit to operate. This allows us to operate the power system safely, securely and economically. If a unit can’t comply with a rule they may apply for derogation from the Grid Code. Search the ‘Grid Code’ and ‘Derogations’ categories in our Library for more information on derogations.

Presentations from all our workshops can be accessed here. You will find the steps and documents for this testing in the sections below. If you have any questions about these documents please contact

DS3 System Services

Providing Units can apply to contract with EirGrid and SONI to provide System Services. More information on System Services can be found on the DS3 Programme page of our website here.

For a unit to receive a contract to provide System Services they are required to demonstrate their capabilities through the compliance and testing processes in advance of contracting. In addition, existing service providers who wish to contract for enhanced capabilities must also demonstrate these enhanced capabilities through a testing process facilitated by the System Operator.

These testing requirements are in addition to the standard Grid Code tests. There is no derogation process if a unit is unsuccessful in completing a System Services test. Further information on System Services testing and compliance requirements can be found here.

Should you have any questions regarding these  documents please refer initially to the guidance document found here or else contact

Primary and Secondary Fuel Obligations

On 20 July 2010, CER published a Decision paper on Secondary Fuel Testing Compensation. This paper sets out the CER’s Decision with regard to the compensation arrangements for generators that carry out tests where they operate on a secondary fuel. To accompany this Decision Paper, EirGrid has compiled two short documents in relation to primary fuel stock levels; and secondary fuel stock levels and testing. These documents can be found here and here. These summary documents set out the testing arrangements and the criteria for a successful secondary fuel test and the compensation arrangements for generators. Follow this link to apply for compensation for a successful secondary fuel test.

Standing Procedure for Generator and Demand Side Unites during System States

This procedure forms part of the EirGrid Group’s power system emergency response planning. It sets out the actions to be taken by Generators and Demand Side Units in response to System Alert and Emergency States. Power system states are issued on a jurisdictional basis.