G99 & G100 Testing Built for the Real Site.
Country-wide G99 and G100 testing services, including on-site witness and non-witness testing for embedded generation projects across the UK and Ireland.
On-Site Testing Structured Around Your Project.
We are pleased to provide a country-wide testing service covering both G99 and G100 on-site witness and non-witness tests.
The guiding principles are based on the requirements for connecting generation equipment in parallel with public distribution networks on or after 27 April 2019.
Each testing programme is developed on a bespoke basis following a full discussion with the DNO engineers involved in the project.
Country-wide testing support for embedded generation projects.
Witness and non-witness testing structured around the installation.
Testing developed through discussion with the engineers involved.
Clear project-based quotation following review of requirements.
Why G99 Protection Matters.
The standard governing mains protection in the UK and Ireland is G99. Since April 2019, G99 mains protection has been an important regulatory standard for both Distribution Network Operators and power generators.
For DNOs & Utilities
- Ensures safe balanced operation of the distribution system.
- Supports reliable delivery of high quality electricity.
- Allows smooth involvement of distributed generation.
- Enables remote control of power supply sources.
For Generating Companies
- Reliable protection of generating plant.
- Simple and standardised implementation across the UK.
We Arrive Prepared for the Test.
When we attend site, we bring our own calibrated testing equipment and general connection equipment to support a smooth setup and testing procedure.
Over the last 10 years we have completed many G99 and G100 tests and, where required, we can also bring our own power injection equipment to site.
Working With DNOs Across the UK & Ireland.
We can work with any DNO in the UK and Ireland, and many engineers will either know our lead tester Dave Pallas or will have trained with him.
For DNO witness testing on embedded generation systems, tell us about your project and requirements. We can discuss the testing approach and provide a fixed quotation.
We are pleased to inform new and existing clients that we are on the recommended list of testing contractors with The National Grid and UKPN.
Listed with The National Grid and UKPN.
Export Restricted Systems & G100 Testing.
The G100 Engineering Recommendations provide guidance for systems where export to the public distribution network is restricted.
Our testing service can support export-restricted systems and associated G100 requirements where applicable, with the testing approach developed around the installation and relevant DNO discussions.
Discuss G100 Requirements →
From Initial Requirements to Site Testing.
Testing requirements vary between installations, so we develop the approach around the project, equipment and relevant DNO requirements.
Project Discussion
Tell us about the generation system, connection and testing requirements.
DNO Requirements
Establish the relevant requirements with the engineers involved.
Testing Preparation
Prepare the appropriate equipment, procedures and site approach.
Site Testing
Attend site and carry out the required witness or non-witness tests.
ENA Guidance & Resources.
On behalf of The National Grid and the DNOs, the Energy Networks Association has provided information relating to the Accelerated Loss of Mains Change Programme.
↗ Energy Networks Association — Accelerated Loss of Mains Change Programme
Need G99 or G100 Testing Support?
Tell us about your generating system, DNO requirements and testing needs. We can review the project, discuss the required testing approach and provide a fixed quotation.
Send us your project information and requirements and our team can review the appropriate next steps.
Request a Fixed Quote →