# Ireland’s data centre grid connection rules

> Ireland’s energy regulator (CRU) decided in December 2025 to tier data centre connections by maximum import capacity. Below **1 MVA** a site is exempt; from 1 to 10 MVA it must provide an **autoproducer unit covering 100% of its MIC**; and sites at or above 1 MVA must show a credible plan to meet at least **80%** of annual demand from new Irish renewable generation within six years.

By Razvan Toma, Founder & CEO, Ampervia · Last checked 2026-10-12 · https://ampervia.com/rules/ireland-data-centre-connection-rules/

## Key facts

- Decision published 12 December 2025; initial proposals due 31 March 2026 (Transatlantic Law).
- De minimis: 1 MVA. Tier 2: 1–10 MVA.
- 1–10 MVA: autoproducer unit able to meet 100% of MIC (Mason Hayes & Curran).
- ≥1 MVA: a credible plan to meet at least 80% of annual demand through new Irish renewable generation, within a six-year glide path (Mason Hayes & Curran).

## Sources

1. [Mason Hayes & Curran — new data centre connection rules](https://www.mhc.ie/latest/insights/new-data-centre-connection-rules)
2. [Transatlantic Law — clarity for Ireland’s data centre sector](https://www.transatlanticlaw.com/content/leap-forward-in-clarity-for-irelands-data-centre-sector-and-large-energy-users/)

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