Unmetered Supplies

What is an Unmetered Supply?

An Unmetered Supply is any electronic equipment that draws a current and is connected to the Distribution Network without a meter recording its energy consumption.

Unmetered Supplies (UMS) exist in the half hourly and non half hourly Supplier Volume Allocation (SVA) markets. The UMS process is governed by BSCP520 - Unmetered Supplies Registered in SMRS. The Unmetered Supplies Operator (UMSO) provides the UMS service on behalf of a distributor.

More in Unmetered Supplies


	Charge Codes and Switch Regimes Charge codes are used within UMSO systems to calculate volumes of electricity consumed. Switch Regimes identify the number of hours the equipment will be operational.


	Central Management Systems (CMS) also known as telemanagement, are the next step in remote dynamic street lighting control.


	The UMS Contacts page provides details for the companies that fulfil Unmetered Supplies roles and functions, providing a starting point for UMS enquiries.

What part does ELEXON play?

We are responsible for ensuring that the processes within BSCP520 are carried out effectively. We are also responsible for issuing charge codes and switch regimes to customers such as product manufacturers, county, borough councils that have an Unmetered Supply inventory.

We also coordinate the Central Management Systems (CMS) process, which is the next step in remote dynamic street lighting control.

The Unmetered Supplies User Group (UMSUG) is an expert group that provides advice on specific UMS related matters.

Managing Unmetered Energy Street Lighting Inventories (MUESLI)

This document is endorsed by ELEXON, the ADEPT Lighting Group, the Institution of Lighting Professionals, the UK Lighting Board and the Local Government Technical Advisors Group as representing good practise in establishing, maintaining and auditing inventories for unmetered street lighting supplies.