UK grid connection queue 2026 reform is one of the most consequential infrastructure stories in British energy. For utility-scale solar and storage, queues stretching to 15 years had become a genuine crisis. For residential homeowners, the picture is more nuanced — most small rooftop systems connect under different rules — but the wider grid investment story does affect how quickly your installer can get approval and what export limits your system may face.
The Scale of the Problem: What Queue Reform Was Addressing
At its peak in 2023–2024, the GB transmission and distribution connection queues held over 750 GW of projects — roughly twelve times the current installed generation capacity. The majority were speculative applications, held in queue without deposits, blocking genuine projects. National Grid ESO (now NESO) and Ofgem launched a comprehensive queue review under the Connections Action Plan in 2024, with major milestones falling in 2025 and 2026.
By December 2025, NESO confirmed a reformed pipeline aligned with Clean Power 2030 and longer-term 2035 capacity needs — representing significant progress in clearing speculative and dormant applications. The queue had been substantially reduced from its peak, though significant backlogs remain and processing timelines are still measured in years for large projects.
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Connect-and-Manage: The Interim Solution
Connect-and-Manage (CaM) is the principle that projects should be connected to the grid even where network constraints exist, with their output managed (curtailed) in real time where necessary, rather than waiting for network upgrades. Ofgem approved an expanded CaM policy for distribution-connected generation in 2025. In 2026, this is enabling solar and battery projects to connect on timelines of 12–24 months in many areas rather than waiting for network reinforcement that could take 5–7 years.
For a homeowner, CaM is largely invisible — residential systems below the G98/G99 threshold connect automatically without a formal queue application. But larger community solar or commercial rooftop projects benefit directly.
G98 and G99: How Residential Connections Actually Work
Most residential solar systems in the UK connect under Engineering Recommendation G98 (systems up to 16 A per phase, typically up to 3.68 kWp single phase). These notify the DNO but do not require prior approval — the installer notifies within 28 days of commissioning. This process is unaffected by the utility-scale queue crisis.
Larger residential systems — typically above 3.68 kWp single phase or any three-phase system — fall under G99 and require a formal application to the distribution network operator (DNO). In 2026, G99 timelines vary by DNO area: Western Power Distribution (now National Grid ESP) has improved to an average of 45 days for standard residential G99 applications; some Northern Powergrid areas still report 90-day waits.
Export Limitation: A Growing Reality for Residential
Where local networks are constrained, DNOs increasingly offer connections on the condition of export limitation — either a fixed export cap (e.g., 3.68 kW regardless of system size) or dynamic export limits controlled by a Smart Export Limiter (SEL). In 2026, a meaningful proportion of new residential solar applications in southern England and parts of the Midlands are receiving export-limited offers from their DNO — the share has been rising in recent years, though DNO-level figures vary and should be confirmed with your local network operator.
Export limitation does not prevent self-consumption — you still generate and use all the solar your roof produces. It simply caps what you can send back to the grid. For households with a battery, an export limit has less impact, since surplus generation can be stored rather than exported.
What 2026 Grid Investment Means for Future Connections
The 2024 Autumn Statement committed £35 billion to grid investment through NESO's Accelerated Strategic Transmission Investment programme over the next decade. At the distribution level, Ofgem's RIIO-ED2 price control funds network reinforcement that should progressively ease constraints in high-density solar deployment areas. The practical impact for homeowners connecting in 2027–2029 should be a reduction in export-limited offers.
Key Takeaways
- Most residential solar systems (under 3.68 kWp single phase) connect under G98 — notification only, no queue, no delay.
- G99 applications for larger systems vary by DNO: allow 45–90 days and confirm timelines with your installer before agreeing a commissioning date.
- Export limitation is increasingly common in constrained areas — if offered, pair with a battery to maintain the value of surplus generation.
- NESO's December 2025 pipeline milestone confirmed meaningful progress in clearing speculative projects, accelerating commercial connection timelines.
- Ongoing grid investment under RIIO-ED2 and NESO's transmission programme should reduce constraints — and export-limited offers — progressively through to 2030.
For most homeowners installing a standard-sized rooftop system in 2026, grid queue issues are not a barrier. The story is more relevant if you are planning a larger system, a battery-first virtual power plant project, or a community energy scheme — in those cases, understanding the G99 process and the export limitation landscape is essential.