ENA EREC G100 Methodology

Know your site's electrical capacity before the DNO does.

Automate EREC G100-based Active Load Management (ALM) feasibility calculations. Instantly model your assessed import limit and ALM feasibility, and generate detailed DNO submission reports in 60 seconds.

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Free online calculation • £49 for full engineering dossier • No subscription

Built for the professionals planning the connection

Electrical Contractors

Assess proposed loads and establish ALM feasibility before submitting formal connection applications.

Property Managers

Evaluate EV, heat-pump, solar PV, and BESS integrations across commercial and industrial portfolios.

Commercial Landlords

Calculate theoretical headroom before committing capital to physical infrastructure upgrades.

Reduce the risk of DNO delays and unnecessary network upgrades.

Establish your curtailment logic and fail-safe strategy before submitting your ENA application.

The Old Way
  • ✗ Submit an application without mathematically proving ALM limits.
  • ✗ Risk lengthy DNO engineering approval delays.
  • ✗ Application rejected for exceeding the Assessed Operating Limit.
  • ✗ Face potential five-figure physical network upgrade quotes.
The Gridcap Way
  • ✓ Enter baseline ADMD and proposed LCT hardware.
  • ✓ Mathematically model the required ALM curtailment reduction.
  • ✓ Generate a comprehensive EREC G100-based network assessment.
  • ✓ Submit to the DNO with documented fail-safe limits and installer verification and sign-off.

Example Gridcap Results

Our algorithm models your proposed load against the applicable assessment criteria to produce a clear engineering outcome.

*The figures below are illustrative examples based on a standard 160A commercial CT supply.

Green — No ALM Required

Assessed Operating Limit152.0 A
Calculated Unmanaged Peak138.0 A
Remaining Operating Margin14.0 A

Your installation can operate under standard unmanaged conditions. Proceed with your standard DNO connection application.

Amber — ALM Required

Assessed Operating Limit152.0 A
Calculated Unmanaged Peak188.0 A
Required ALM Reduction36.0 A

Load exceeds the assessed import limit. An Active Load Management (ALM) strategy, assessed against the applicable requirements of EREC G100, must be specified.

Red — Upgrade Required

Assessed Operating Limit152.0 A
Calculated Unmanaged Peak350.0 A
Capacity Deficit198.0 A

Load exceeds the assessed capacity beyond the modelled ALM operating range. A physical supply capacity upgrade should therefore be assessed with the DNO.

Run your site assessment

Calculate your After Diversity Maximum Demand (ADMD) and ALM feasibility below.

Don't know your DNO or network operator? Find it here →

ALM Feasibility Assessment

For projects using Active Load Management, DNO applications may require technical information demonstrating how site demand will be managed within the agreed import limit.

See exactly what your
£49 assessment produces

A consultancy-grade engineering dossier, featuring supply-capacity, ADMD and ALM calculations, EREC G100 fail-safe declarations, and installer verification and sign-off.

Gridcap Engineering Dossier
Gridcap Engineering Report Preview

Frequently Asked Questions

What information do I need to complete an assessment?
You will need the site Postcode and MPAN, the main cut-out fuse rating, a rough estimate of the existing baseline load (or property type for standard diversity assumptions), and the kW ratings for your proposed EV, Heat Pump, Solar PV, and BESS installations.
What does the £49 report include?
You instantly receive a detailed PDF engineering dossier containing a Document Control summary, ADMD Demand Profiling, Unmanaged Peak Calculations, an ALM curtailment framework (if required), EREC G100 fail-safe declarations, and a formal installer sign-off page.
What is Active Load Management (ALM)?
ALM dynamically monitors your building's total electrical draw in real-time via a CT clamp at the Point of Common Coupling (PCC). If the total load approaches the Assessed Operating Limit of your supply, the ALM hardware automatically throttles power to your EV chargers or heat pumps, potentially avoiding the need for a physical supply upgrade.
Which DNOs does Gridcap support?
Gridcap calculations and methodology are based on national ENA standards (including EREC G100). Therefore, the assessment is applicable across all UK Distribution Network Operators (UK Power Networks, SSEN, National Grid Electricity Distribution (NGED), SP Energy Networks, Northern Powergrid, and Electricity North West).
Does this guarantee DNO approval?
Gridcap provides the mathematical modeling and technical documentation to support your DNO connection application. While this report assesses the theoretical feasibility of your ALM strategy, final approval always remains at the discretion of the regional DNO and requires correct physical installation by a competent person.
Is Gridcap for commercial or domestic installations?
Gridcap is built primarily for commercial electrical projects (three-phase supplies, multiple LCTs, complex load profiles). However, it is fully capable of assessing single-phase applications requiring ALM logic.