A Grid Connection Feasibility Study is an early-stage investigation into whether the local network can support a proposed generation or import project, before you commit to a formal DNO application.
When to request one
A feasibility study is worth considering when:
- Project size is commercial or utility-scale (typically above ~500 kW, always above ~1 MW).
- Site location suggests network constraint (rural, remote, or a known constrained area).
- The customer wants to understand cost and viability before committing.
- You're evaluating multiple potential sites and want to compare grid outcomes.
- Battery storage, EV charging hubs or large loads are involved and the import headroom is uncertain.
When you don't need one
For a straightforward domestic G98 or small G99 application, a feasibility study is normally unnecessary. Just apply.
What the study covers
- Available network capacity at the point of connection.
- Likely reinforcement requirements (if any).
- An indicative connection cost band from the DNO.
- Timescale expectations.
What it doesn't do
- A feasibility study doesn't guarantee capacity. Network conditions change and formal offers can differ.
- It doesn't include the DNO's own application fees. Those are separate.
What happens after the study
If the study confirms the project is viable, you can progress to a formal application with a much clearer picture of what to expect. If it identifies a problem — insufficient capacity, expensive reinforcement, long timescales — you know before spending on a full submission.