Connecting a solar farm to the UK grid requires applying to the local Distribution Network Operator (DNO) or National Grid, securing available capacity, and funding any required infrastructure upgrades. The process typically takes 12–36 months and can cost anywhere from £50,000 to over £5 million depending on location and grid constraints.
Step-by-Step Process
- Initial Feasibility Assessment
Assess grid capacity and identify the nearest viable connection point.
- Submit Application (G99)
Apply to the relevant DNO or National Grid for a connection offer.
- Receive Connection Offer
This outlines costs, timelines, and required reinforcement works.
- Accept Offer & Secure Capacity
Pay initial fees and formally accept the connection.
- Detailed Design & Construction
Infrastructure is designed and built, often by a NERS accredited ICP.
- Testing & Energisation
Final commissioning and connection to the grid.
Typical Timeline
- Feasibility & application: 1–3 months
- Offer stage: 3–9 months
- Construction: 6–18 months
Total: 12–36 months (longer in constrained areas)
Costs
- Small solar projects: £50k–£500k
- Medium-scale: £500k–£2M
- Large-scale / constrained sites: £2M–£5M+
Common Delays
- Limited grid capacity
- Upstream reinforcement requirements
- Long DNO response times
Industry Insight: In 2025–2026, the majority of delays are caused by upstream reinforcement rather than the application process itself.
How to Reduce Delays
- Conduct early grid feasibility studies
- Engage an ICP to design around constraints
- Secure capacity as early as possible
Example
A 12MW solar project in the Midlands required upstream reinforcement, increasing costs by over £1.2M and adding 9 months to the timeline.
FAQs
How long does it take to connect a solar farm?
Typically 12–36 months depending on grid availability.
Who handles the connection process?
Developers can work with a DNO or a NERS accredited ICP such as Renewable Power Connections Ltd.
Can the process be sped up?
In some cases, yes—through better site selection and early engagement with an ICP.