ESB Micro-Generation Application Guide #

Brought to you by VEEP Energy

If you’re planning to install solar panels at your home or business, one of the first questions you’ll face is: “Which ESB Networks application form do I need — NC5, NC6, NC7, or NC8 — and why?”

This guide from VEEP Energy explains the differences in clear, practical terms.

NC5 – Existing Connection Upgrade / Non-Exporting Generation (>200 kVA) #

The NC5 form is used in two main scenarios:

1. Connection Upgrade:
   If your existing ESB meter or connection cannot safely handle additional generation capacity — for example, upgrading from a small domestic setup to a three-phase supply — an NC5 application is required to modify or strengthen the connection.

2. Large Non-Exporting Generators (>200 kVA):
   For systems above 200 kVA that are not exporting electricity to the grid, the NC5 form is also the correct route. These are usually large commercial or industrial systems designed primarily for on-site use, such as PV systems, CHP units, or standby generators. ESB performs a network impact study before approval.

Use NC5 if:
– You are upgrading from single to three-phase or increasing your Maximum Import Capacity (MIC);
– You are installing a non-exporting generator above 200 kVA;
– You have been advised by ESB Networks that your connection requires reinforcement or technical review.

Exporting generators above this range are handled under the Enduring Connection Policy (ECP) process, not through the NC-form system.

NC6 – Micro-Generation (Up to 6 kVA Single-Phase / 11 kVA Three-Phase) #

The NC6 application covers small domestic and light commercial solar systems, known as micro-generators. These operate in parallel with ESB’s low-voltage (LV) network and are limited to:
– Up to 25 A (~6 kVA) on single-phase connections (230 V)
– Up to 16 A (~11 kVA) on three-phase connections (230/400 V)

ESB temporarily accepted units rated up to 28 A single-phase, but this allowance ended on 31 May 2023. From that date, any inverter exceeding 25 A single-phase no longer qualifies under NC6.

Use NC6 if your PV system fits within these limits — typical for most homes and small businesses.

NC7 – Mini-Generation (6 kVA – 17 kVA Single-Phase / 11 kVA – 50 kVA Three-Phase) #

When your PV system exceeds the NC6 limits, you move into the Mini-Generation category. These are medium-sized systems designed to offset daytime energy use — common in schools, farms, retail units, and light industrial sites.

Defined limits:
– 25 A (6 kVA) to 72 A (17 kVA) on single-phase
– 16 A (11 kVA) to 72 A (50 kVA) on three-phase

Mini-Generators operate in parallel with ESB’s network for self-consumption. They help reduce costs and carbon footprint, supporting Ireland’s clean-energy goals.

Use NC7 if your inverter size falls within these ranges.

NC8 – Small-Scale Generation (50 kVA – 200 kVA) #

If your PV installation is part of a larger commercial, agricultural, or public-sector project, it will likely fall under the NC8 category.

NC8 applies to inverter-connected or synchronous systems where:
– Installed capacity is greater than 72 A (~50 kVA) and up to 200 kVA, and
– Capacity does not exceed your site’s Maximum Import Capacity (MIC).

Notes:
– The maximum single-phase connection is 72 A (~17 kVA).
– Anything larger must be three-phase.
– Typical examples include factories, schools, supermarkets, and commercial roofs.

Summary Table #

Final Note from VEEP Energy #

Choosing the right ESB application ensures your solar PV system is safely connected, compliant, and approved without delays. At VEEP Energy, we assist our clients with all required NC5–NC8 applications, Safe Electric certification, and SEAI grant documentation, providing a complete turnkey service from design to grid connection.