CMOS

The Central Market Operating System (CMOS) is the core IT system for the non-household market. CMOS manages all the electronic transactions involved in switching customers and provides water usage and settlement data. MOSL, in partnership with CGI, are continually working to improve CMOS operations. Here you’ll find MOSL’s release plans, outlining future functionality.

CMOS – Next Release

CMOS 18.0 Release Notes

10/11/2025

CMOS – Current Release

CMOS Maintenance Schedule 2025-2026

27/10/2025

CMOS 17.5 Release Notes

12/08/2025

CMOS Release Schedule 2025-2026

06/06/2025

CMOS – Previous Release

CMOS 17.0 Release Note

12/05/2025

Error Codes 17.0.1.0

12/05/2025

Data Management

DQA Portal Overiew Video Transcript

29/09/2025

DQA New User Admin Video transcript

29/09/2025

CMOS Data Retention / Deletion

19/07/2024

Maximum number of transactions to be submitted into CMOS

24/06/2024

Defect Management

ALM Observations (Defect Log)

27/10/2025

CMOS Administration

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MVI Guidance

SSO Login Guide

Trading Party System Proforma

Raising tickets with CGI – ServiceNow instructions

System Connection Guidance

USR SPID/SC template

MVI Batch Template

SPID Flows Tradability

Recreating Supply Points Following Erroneous Deregistration

Non-Code Change (NCC) Request Guidance

NCC Change Request Template

FTP Reporting Login Instructions

Agreement Management (Wholesale) Guidance Note

CMOS Training Videos

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CMOS user report demo

CMOS General Training

Reporting Overview

CMOS Training Documents

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CMOS 17.5 Retailer User Manual

CMOS 17.5 Wholesaler User Manual

Tariff data upload 2025-2026

Viewing and Creating Agreements in CMOS

Reporting Training Student Workbook

Reporting Training Presentation slides

Reporting Training Course Schedule

Remedy Service Management Interface

CMOS 3.0 Reporting User Manual

MOSL Guidance

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My MOSL Late Payment Guidance

My MOSL User Admin guidance

My MOSL - Gap Site Guidance

QMS Generic Queries User Guide

Submitting an General Query Request

MOSL Partner Account Guide

Submitting an Unplanned Settlement Run Request

Related pages

Non-code change requests

View CMOS-impacting change requests here.

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Operations and Release Working Group (ORWG)

The latest outputs from the ORWG.

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CMOS – Release archive

CMOS 16.0 Release Note

16/12/2024

Error Codes 16.0.1.2

19/11/2024

XSDs for CMOS Release 16.0

13/11/2024

CMOS 15 Release Notes

13/05/2024

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