Grid Code Modifications
Find a list of all modifications made to the Grid Code.
Housekeeping Modifications
The Grid Code needs to be adaptable and responsive - it is a living document that is constantly evolving, and so requires consistent maintenance in the form of housekeeping modifications.
A Grid Code Housekeeping Modification is a modification that:
- Does not add or remove a requirement from any user of the Grid Code;
- Does not make a material change or impact to the existing compliance of any user under the Grid Code;
- Aims to ensure that the Grid Code is as accessible as possible, and that the form of each clause is well-structured and conveys the correct meaning.
Housekeeping of the Grid Code is an ongoing process, EirGrid, as TSO, is undergoing a streamlined process for housekeeping modifications from October to December 2024.
The documents below track the status of housekeeping modifications.
The following Grid Code modifications include any updates made in version 6 and any updates made after version 6 was issued.
If you would like to make a modification to the Grid Code, complete the form linked below and send it to:
MPID | Title | Status | Effective Date | Grid Code Version |
|---|---|---|---|---|
349 | ||||
348 | ||||
347 | ||||
346 | ||||
345 | MPID345 Demand Facilities FRT Recommendation Paper Final 01042026 (PDF, 16.99MB)MPID345 Grid Code Modification Compliance and Derogation Process Framework (PDF, 1.12MB)Fault Ride Through (FRT) and Active Power Recovery (APR) Study Assessment Guide for Demand Facilities (PDF, 0.52MB)Rate Of Change Of Frequency (RoCoF) Study Assessment Guide For Demand Facilities (PDF, 0.66MB)Fault Ride Through Overview Document (Plain English) April 2026 (PDF, 0.12MB) | |||
343 | ||||
342 | ||||
341 | ||||
340 | ||||
339 | ||||
337 | ||||
336 | ||||
335 | ||||
332 | 15 | |||
331 | 15 | |||
329 | ||||
327 | ||||
326 | 15 | |||
325 | 15 | |||
322 | 15 | |||
321 | 15 | |||
320 | ||||
319 | MPID 319 Incorporation of SCUs | |||
318 | 15 | |||
317 | 15 | |||
315 | 14 | |||
314 | 13 | |||
313 | 13 | |||
312 | 14 | |||
311 | 13 | |||
310 | 13 | |||
309 | 13 | |||
308 | 13 | |||
307 | 13 | |||
306 | 13 | |||
305 | 14 | |||
304 | 13 | |||
302 | 13 | |||
301 | 13 | |||
229(a) | 13 | |||
300 | 12 | |||
299 | Withdrawn March 2024 | |||
298 | 12 | |||
297 | 12 | |||
296 | 11 | |||
278 | 11 | |||
294 | 12 | |||
293 | ||||
292 | 11 | |||
291 | 11 | |||
290 | 11 | |||
289 | 11 | |||
288 | 10 | |||
287 | 10 | |||
286 | 10 | |||
285 | 10 | |||
284 | 9 | |||
283 | 9 | |||
282 | 9 | |||
281 | 9 | |||
280 | 9 | |||
279 | 9 | |||
278 | ||||
277 | The TSO came to the conclusion that no modification was required to the Grid Code. It was agreed with IWEA that the TSO will issue a Grid Code clarification note along with guiding principles to be used when assessing Grid Code compliance. | |||
276 (a) revised | 9 | |||
276 | Incorporation of: Approved European Network Demand Connection Code (DCC) | Approved European Network Code Requirements for Generators – Operational Notification Procedure & Derogation Process | Housekeeping Modification MPID 276 Proposal Papers (ZIP, 8.02MB) | 12/03/2020 – MPID 276 (a) - decision deferred by the CRU. 12/03/2020 – Partial approval from CRU for MPID 276 (b) (c) and (d). (PDF, 0.13MB) | 8.1 | |
275 | 8 | |||
274 | 7 | |||
273 | 7 | |||
272 | 7 | |||
271 (a) | 7 | |||
271 | Consultation response period is closed | 7 | ||
270 | 7 | |||
269 | 7 | |||
268 | ||||
239 | 7 | |||
267 | 7 | |||
266 | 7 | |||
265 | ON HOLD, Proposed Modification 11 February 2015, Proposed Modification 12 November 2014 | |||
264 | 7 | |||
262 | ON HOLD, Proposed Modification 11 February 2015, Proposed Modification 12 November 2014 | |||
261 | 7 | |||
260 | 6 | |||
259 | 6 | |||
258 | APPROVED | 6 | ||
257 | 7 | |||
256 | 6 | |||
255 | 6 | |||
254 | 7 | |||
253 | 6 | |||
252 | 7 | |||
251 | 6 | |||
250 | 7 | |||
249 | 6 | |||
248 | 6 | |||
247 | 6 | |||
246 | 6 | |||
245 | 15/04/14 | 6 | ||
244 | 6 | |||
229 | Approved in Principle – 04/04/2014 | |||
223 | 7 |