MP092 New Planned Maintenance methodology

Proposer Darren Robbins
Lead Analyst SEC Change
Date raised 22/10/2019
Implementation date 25/02/2021 (February 2021 SEC Release)
Latest update This modification was implemented on 25 February 2021 as part of the February 2021 SEC Release.

What is the issue?

In April 2019 the DCC began a trial of a new approach regarding the delivery of Planned Maintenance. The new approach sought to categorise planned changes as either low or high impact, based upon a risk-based methodology. It also amended the timings with which Planned Maintenance was scheduled and implemented.
Whilst the SEC is silent on the methodology for scoping Planned Maintenance, it does set out when the Maintenance should occur and the timescales around publishing Maintenance schedules (Sections H8.3 and H8.4). In order to trial the new approach, the SEC Panel granted the DCC a derogation against these provisions for six months (later extending for a further three months until February 2020). The Panel requested the DCC report on progress to the Operations Group.

In July, the DCC reported the trial had been a success and, following a final report to the Operations Group, intended to raise a Modification Proposal to formalise the new approach.

What is the solution?

The DCC is proposing implementing the new methodology on an enduring basis, to allow more low impact changes to be implemented more of the time and allow more focus on fewer high impact changes.

The solution aims to improve visibility of changes to SEC Parties, improve quality of changes deployed, improve alignment to demand and focus on business impact rather than solely focusing on the amount of downtime. This requires update to the SEC to create the concept of High and Low Impact Maintenance windows and detailing the outage duration associated with each.

Who is impacted?

All SEC Parties

What SEC documents are affected?

Section A ‘Definitions and Interpretations’
Section H 'DCC Services'
Appendix AL ‘SMETS1 Transition and Migration Approach Document’


22 Oct 2019
Draft Proposal Raised
15 Nov 2019
Draft Proposal converted to Modification Proposal
18 Nov 2019
Preliminary Assessment requested from the DCC
01 Jul 2020
Modification discussed with Working Group
14 Dec 2020
Modification Report Consultation
20 Jan 2021
Change Board Vote
25 Feb 2021

Modification documents

MP092 Conclusions Report
MP092 Modification Report Consultation
MP092 Refinement Consultation Responses
MP092 Preliminary Assessment
MP092 Refinement Consultation
DP092 Problem Statement
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