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EV charging glossary

Industry jargon

G99

Also called: EREC G99, Engineering Recommendation G99 G99 is an Energy Networks Association engineering recommendation setting technical requirements for generation equipment connected in parallel with public distribution networks in Great Britain. It covers Type A, B, C and D Power Generating Modules connected to licensed DNO networks. The current GB document is G99 Issue 2, published in March 2025. It is relevant to EV charging sites that also include generation, electricity storage or bidirectional export arrangements where the equipment falls within G99. G99 and G100 address different connection issues. G99 concerns generation connected in parallel with the network, while G100 covers agreed customer import or export limitation schemes.

Related terms

G100

G98

Vehicle-to-grid
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