Unmetered Supplies


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.


The processes within BSCP520 must be carried out effectively. Charge codes and switch regimes will be delivered 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.

Groups and committees

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

Useful information

Managing Unmetered Energy Street Lighting Inventories document has been endorsed by the ADEPT Lighting Group, Elexon, the Energy Networks Association, the Institution of Lighting Professionals, the UK Lighting Board and the Local Government Technical Advisers Group as representing good practice in establishing, maintaining and auditing inventories for unmetered street lighting supplies.

About ILP

The Institution of Lighting Professionals (ILP) is the UK and Ireland’s largest professional lighting association. The Institution is a registered charity, a limited company and a licensed body of the Engineering Council.

The key purpose of the ILP is to promote excellence in all forms of lighting. This includes:

  • interior
  • exterior
  • sports
  • road
  • flood
  • emergency
  • tunnel
  • security
  • festive lighting


Click on the X next to any of the icons to replace them with a short-cut link to the page you are currently on or search for a specific page.

List of BSC Insights

Previous Circulars

Training videos and services

Market Entry

Charge Codes and Switch Regimes

Add New