Verdant-Future Energy Ltd
G98, G99 & G100 Certifications: Grid Connection & Export Control Approvals
Connecting renewable energy systems to the UK electricity grid is about more than installation alone. To operate legally, safely and optimally, systems must comply with national engineering standards that govern how energy is generated, exported and controlled.
At Verdant Future, we manage the full process for G98, G99 and G100 certifications. We ensure your solar PV, battery storage or hybrid energy system is approved, compliant and future-proofed.
Whether you’re installing a modest system or a large commercial energy asset, we handle the grid approvals that unlock real performance, savings and revenue.
What Are G98, G99 and G100?
These are UK Engineering Recommendations (ERECs) issued by the Energy Networks Association (ENA). Together, they define how distributed generation and storage systems connect to, and interact with, the local Distribution Network Operator (DNO).
Each standard applies depending on system size, export capability and network impact.
G98: Microgeneration Notification
G98 applies to smaller generation systems with a capacity of up to 3.68kW per phase (or 11.04kW for three-phase systems).
Key points:
- Installation can proceed without prior DNO approval
- The system must be notified to the DNO within 28 days of commissioning
- Commonly applies to:
- Small commercial installations
- Certain estate or auxiliary buildings
- Low-export battery or solar systems
G98 provides a streamlined route to grid compliance where network impact is minimal.
G99: Pre-Approval for Larger Systems
G99 applies to larger or more complex systems that exceed G98 limits. These include most commercial solar arrays and battery storage systems with export capability.
Under G99:
- DNO approval is required before installation
- A formal technical assessment is carried out
- Applications may include:
- Electrical schematics and single-line diagrams
- Protection settings and inverter data
- Export capacity and network impact information
- Approval timelines typically range from 8–12+ weeks, depending on network constraints
G99 ensures that higher-capacity systems integrate safely without overloading or destabilising the local grid.
G100: Export Limitation & Control
G100 governs export-limiting schemes, making it especially relevant for modern commercial energy systems.
It applies where:
- Installed generation capacity exceeds what the grid can accept
- Export must be actively limited or controlled
- Systems include solar, batteries, or hybrid configurations
G100 ensures:
- Export is capped to an agreed level
- Control systems respond dynamically and reliably
- Export limits are enforced even during fault conditions
G100 is often used alongside G99, enabling projects to proceed where grid capacity would otherwise be a barrier.
G98 vs G99 vs G100 at a Glance
| Feature | G98 | G99 | G100 |
| Typical Use | Small single phase systems | Larger three phase systems | Export-limited systems |
| Approval Timing | Post-install notification | Pre-installation approval | Integrated control approval |
| Export Control | Fixed | Defined | Actively limited |
| Common For | Small solar | Commercial solar & BESS | Grid-constrained sites |
Why These Certifications Matter
Legal & Regulatory Compliance
All grid-connected generation in the UK must comply with the relevant EREC standards. Failure to do so can result in:
- Refusal of export
- Delays in commissioning
- Potential disconnection by the DNO
Safety & Network Stability
These standards protect:
- Your site and equipment
- The wider electricity network
- Other connected users
They ensure systems operate safely during normal conditions, faults and grid disturbances.
Revenue & Export Eligibility
Correct certification is essential if you plan to:
- Export power to the grid
- Participate in Smart Export Guarantee (SEG) tariffs
- Monetise surplus generation
Combine solar with battery-led export strategies
What Verdant Future Delivers
Grid compliance can be one of the most complex and misunderstood parts of a renewable project. This is especially so when export limits, hybrid systems or phased installations are involved.
Verdant Future provides end-to-end management of the entire certification process:
- Assessing which standards apply (G98, G99, G100 or a combination)
- Designing compliant export and control strategies
- Preparing and submitting all DNO documentation
- Liaising directly with network operators
- Managing technical queries and approvals
- Aligning grid compliance with your wider energy and financial strategy
We ensure approvals are designed in, not bolted on. This reduces risk, delays and unexpected costs.
Who This Service Is For
- Commercial and industrial businesses
- Private estates and landowners
- Developers and asset owners
- Battery storage and hybrid system operators
- Sites constrained by grid export capacity
- Projects seeking maximum self-consumption with controlled export
Whether your priority is cost reduction, energy resilience, revenue generation or ESG performance, compliant grid connection is foundational.
Why Choose Verdant Future for your G98,G99 & G100 Certifications?
We don’t treat grid approvals as an administrative tick-box. G98, G99 and G100 are legal requirements which enable:
- Larger systems
- Faster deployment
- Better returns
- Smarter export control
- Long-term flexibility
Our experience across solar, battery storage, estates, listed assets and commercial sites means approvals are aligned with real-world outcomes, not theoretical designs.