What is a Half Hourly Meter?

24th September 2021

There are various types of electricity meter available to businesses, with the right model dependent on energy usage.

Half hourly (HH) meters are used to measure electricity within larger businesses which use over 100kWh of electricity at any given time. The National Grid monitors these high levels of energy every half hour using automatic meter readings (AMR) to provide a more accurate reading.

You will need a Data Collector (DC) to process half hourly readings, and a Meter Operator Agreement (MOP) to assist with the installation and maintenance of your meter.A Meter Operator Agreement or (MOP contract) is a legal requirement for half hourly electricity supplied meters. The MOP covers the supply, maintenance and telecommunications for sending consumption data to your supplier.

As part of the de-regulated UK energy market you now have the right to appoint your own meter operator, instead of this being overseen by your current energy supplier. The cost for this service is often hidden in a standing charge, as the MOP is no longer part of your supply agreement.

What is the difference between half hourly and non-half hourly meters?

While standard business energy meters require you to make a note of your reading and send it to your supplier, half hourly meters closely monitor usage and automatically submit readings to your supplier every 30 minutes. In contrast, a smart meter will only provide a monthly meter reading for your business.

How do I know if I have a Half Hourly (100kWh) supply?

Check a previous energy bill to find your supply number. If the number on the right of the ‘S’ is ‘00’ you have a half hourly meter. (Half hourly meters are sometimes referred to as 00 meters because of this classification).

If your business uses at least 100 kWh or more in any half-hour period, it is mandatory for you to have a half-hourly meter installed under UK law.

If your business uses 70 kWh in any half hour period, installation is optional, but you can elect to have a half-hourly metering system installed due to the energy-monitoring benefits.

Is your Meter affected by P272?

The Ofgem regulation P272 affects the way suppliers classify electricity consumption for businesses within specified energy usage. Meters with 05-08 profiles are now settled half hourly and have been reprofiled as half hourly meters.

If the S number on your Meter Point Administration Number (MPAN) is 05, 06, 07 or 08, your meter will change to 00, with half-hourly readings taken as part of P272.

What are the benefits of half-hourly meters?

Regular automatic readings ensure you’re billed as accurately as possible, and therefore less likely to be incorrectly charged. The level of detail provided by a half hourly meter allows you to access information about usage. This is stored by

your energy provider, and can help businesses to identify patterns, moderate processes, and forecast spend.

This information is helpful when working towards improving energy efficiency, or implementing energy saving measures to help cut costs and reduce carbon footprint.

As your energy provider can analyse consumption, they can often offer electricity tariffs tailored to exact usage. Archived energy data can also be used to negotiate your next contract. Half hourly meters allow you to tailor your electricity deal to meet business demand and budget.

Half Hourly Meters: Key Points

• Half-hourly electricity meters are more accurate and reduce the risk of large businesses overspending.

• If your business uses 100 kWh or more of electricity in any half-hour period, you are legally obliged to have a half-hourly meter system, and MOP, in place.

• Data generated can help businesses work towards improved energy efficiency, and save costs with contracts tailored to exact requirements.

If you think you might require a half hourly meter, or want to find the best deal for your existing half hourly meter in a matter of minutes, contact the experts at Green Energy Advice Bureau (GEAB) for free impartial advice.

Our Energy Experts are ready to take your call 9am -5pm, Monday to Friday on 0800 084 3477.