DNO by Region — G99 Connection Patterns for FE College Solar Across the UK

UK Distribution Network Operators (DNOs) administer G99 grid connection for solar projects across their regional territories. Each DNO has its own process, fees, timelines and idiosyncrasies. For FE colleges with multi-region campuses (notably NCG, with sites from Cumbria to Lewisham), understanding the regional DNO landscape matters.

DNO map of the UK

Eight DNO companies cover the UK:

DNO	Region	Typical FE engagement
Northern Powergrid (NPg)	North East England + Yorkshire	NCG Newcastle, Hull College Group, Sunderland, DN Colleges
Electricity North West (ENW)	NW England	LTE Group, Liverpool City College, Trafford College, Reaseheath, Myerscough
SP Manweb	North Wales + Cheshire + Merseyside	Coleg Cambria, Reaseheath, Liverpool catchment
National Grid Electricity Distribution (NGED, formerly WPD)	Midlands + South West + South Wales	BMet, Coventry College, Bristol College, Cardiff and Vale, NCG Kidderminster
UK Power Networks (UKPN)	London + South East + East	Capital City College Group, New City College, South Thames Colleges, Activate Learning
SSEN (Scottish and Southern Electricity Networks)	Central southern England + central and southern Scotland	Reading, Southampton catchment, Edinburgh College, Forth Valley
ScottishPower Energy Networks (SPEN)	Central Scotland + N Scotland	Glasgow Clyde College, Glasgow Kelvin, West College Scotland
NIE Networks	Northern Ireland	Belfast Met, all NI Regional Colleges, CAFRE

Typical G99 timeline by DNO

DNO processing varies — typical 2026 turnarounds:

DNO	Sub-50 kW G99	50-200 kW G99	200-500 kW G99	500 kW+ G99
NPg	6-10 wk	10-14 wk	14-18 wk	16-22 wk
ENW	6-10 wk	10-13 wk	13-17 wk	16-21 wk
SP Manweb	6-10 wk	10-14 wk	14-18 wk	17-23 wk
NGED (WPD)	5-9 wk	9-13 wk	13-17 wk	16-22 wk
UKPN	7-12 wk	11-15 wk	15-19 wk	18-24 wk
SSEN	6-11 wk	10-14 wk	14-18 wk	17-23 wk
SPEN	6-10 wk	10-13 wk	13-17 wk	16-21 wk
NIE Networks	4-8 wk	8-12 wk	12-16 wk	15-20 wk

UKPN is typically the slowest mainland UK DNO (high application volume in London/SE); NIE Networks and NGED are typically the fastest.

Common clarification requests by DNO

Patterns we see across DNOs:

Northern Powergrid (NPg)

• Strong on network reinforcement assessment for installs above 250 kW
• Frequently requests detailed earthing arrangement clarification
• Typically requires anti-islanding documentation for battery integrations

Electricity North West (ENW)

• Active in voltage rise assessment on weaker sections
• Sometimes requires Network Study for installs above 400 kW
• Strong on protection settings clarification

National Grid Electricity Distribution (NGED, formerly WPD)

• Fastest mainland UK DNO on average
• Generally low clarification rate for well-prepared applications
• Strong online application portal

UK Power Networks (UKPN)

• High application volume slows processing
• Frequently requests Network Study for installs above 350 kW
• Active in export limitation discussions for constrained connections

SSEN

• Mixed processing speed depending on region (central southern vs Scotland)
• Strong on protection coordination documentation
• Sometimes requires detailed transformer impedance modelling

ScottishPower Energy Networks (SPEN)

• Strong on substation upgrade requirements
• Sometimes requires Network Study for installs above 400 kW
• Active in voltage support requirements

NIE Networks

• Smaller network — faster processing typically
• High coordination with NI commercial supply contracts
• Sometimes requires specific protection arrangements for islanded networks

G99 fees comparison

DNO fees vary modestly:

• Application fee: £200-£500 typical across all DNOs
• Network Study fee (where required): £3,000-£15,000 — varies significantly
• Connection agreement fee: £500-£2,000
• Network reinforcement costs (where required): Highly variable — sometimes zero, sometimes £20,000-£100,000+

For most FE college projects under 500 kW, total G99-related fees are £500-£3,000. For larger projects requiring Network Study, fees can be £4,000-£18,000 plus any reinforcement.

Multi-region group corp considerations

Group corps with campuses across multiple DNO regions (NCG most notably) face coordination overhead:

• Multiple G99 applications running in parallel — one per campus, processed by the relevant DNO
• Different fee structures apply per region
• Different clarification patterns per DNO
• Different reinforcement risks per region

A single DNO liaison resource managing all applications in parallel typically saves 4-8 weeks vs sequential processing. For a 6-8 campus group corp, this matters for portfolio rollout timeline.

What to ask your DNO at first contact

Five questions to put to the DNO at the pre-application stage:

1. What is your typical G99 processing time for installs at this scale?
2. Is the proposed connection point on a network section that has recent reinforcement activity?
3. Are there current export limitation requirements in this area?
4. What is your fee schedule for application, Network Study (if required), and connection agreement?
5. What is your preferred protection scheme and inverter family for connections at this scale?

Asking these questions upfront avoids 3-6 weeks of back-and-forth on clarifications.

Practical implication

For FE Sustainability Leads planning solar projects in 2026:

• Start the G99 application within the first 8 weeks of project kickoff. The DNO timeline is almost always the critical-path item.
• Use a competent DNO liaison. Specialist liaisons who know each DNO’s clarification patterns save substantial back-and-forth.
• Plan installation around the DNO timeline, not vice versa. Buffer your build programme by 2-4 weeks against expected G99 connection date.
• Don’t underestimate Network Study risk for installs above 400 kW. Budget £5-15k and 4-8 extra weeks if your install is in this range.

Related guides

• G99 DNO application timeline
• Year-one implementation checklist
• Multi-site portfolio solar programmes