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29 October 2026

Connecting distributed generation to the grid: why G99 and G100 matter

Getting DNO approval for distributed generation is rarely straightforward, and the time taken to secure permission is often a source of frustration.

However, it’s worth remembering that the DNO has a critical responsibility: to ensure that new connections don’t compromise the safety, stability or integrity of the electricity network.

Thankfully, G99 provides a standardised framework for assessing generation connections, with defined technical requirements and information presented in a consistent format. This allows the DNO to assess key issues such as fault levels, thermal limits and voltage control.

But there’s an important distinction: the DNO’s role is to assess whether a proposed connection is acceptable, not necessarily to find the most cost-effective solution for the customer.

As sites become more complex, combining multiple generation sources, on-site loads and battery storage, the challenge increases. In some cases, a Customer Limiting Scheme (CLS) designed to control import and/or export can help manage network constraints and potentially avoid or reduce costly grid upgrades.

This is where G100 comes into play.

If you’re developing a project involving distributed generation or battery storage, and want to understand whether a G100-compliant limiting scheme could reduce your grid connection costs, please get in touch.