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Half-Hourly Meters for Businesses

If you are an energy-intensive business, half-hourly meters could save you a lot of money. Estimated meter readings often see you overpay for energy, and over time this can cost your business sizeable amounts.

Installing a half-hourly meter ensures you are billed correctly for the energy you use rather than absorbing the extra cost of inaccurate meter readings.

If your business uses 100kW or more of electricity in three or more half-hour periods in a year, you are legally required to use half-hourly metering. This obligation exists to promote accurate measurement and reporting of electricity consumption for energy-intensive businesses.

Lauren Smith
Mike Rowe
Written by Lauren Smith
Edited by Mike Rowe
17 November 2025
6 mins read

What is a half-hourly meter?

A half-hourly meter is an electricity meter for businesses that automatically sends readings to your supplier every 30 minutes.

This removes the need for you to supply regular meter readings to your energy provider and ensures you are accurately charged for the electricity you use.

Half-hourly meters typically rely on a phone line or Wi-Fi connection to relay your energy usage to a supplier.

Their user-friendly interface allows you to closely monitor your energy usage data and act accordingly to tailor your energy deal to fit the exact requirements of your business.

Half-hourly meters are typically used by larger businesses with high electricity demand, with the granular data provided enabling them to manage their energy usage more effectively, identify opportunities for energy efficiency enhancements, and ultimately save them money.

While half-hourly meters are legally required for businesses that use 100kW or more during any half-hour period, smaller businesses that have a maximum half-hourly usage of 70kW or more can also elect to install one.

Half-hourly meters vs standard electricity meters: What’s the difference?

The primary difference is that half-hourly meters automatically update your electricity supplier with meter readings at 30-minute intervals, whereas standard electricity meters require you to take manual meter readings and send them to your supplier.

Also, half-hourly meters are usually used by large, energy-intensive businesses. Accurate energy usage data is of paramount importance given the scale of electricity these businesses use. Half-hourly meters allow these businesses to monitor their energy usage patterns with a higher degree of accuracy. On the other hand, standard electricity meters are usually used by SMEs and residential customers, who typically have less complex energy requirements.

How do I find out what type of meter I have?

If you are uncertain what type of meter your business is using, your first port of call is your energy provider. Call them up and they ought to be able to tell you whether it’s a smart meter, standard meter, economy 7, AMR or any other kind of meter.

Alternatively, check your meter itself. If it has a digital display, it may tell you its make, model, and meter type on the interface or in its settings.

You can also check your energy bills, as they often include information about your meter type.

What are the benefits of half-hourly meters?

There are numerous benefits to half-hourly meters, particularly for larger businesses and organisations, including:

  • Accurate billing

    Half-hourly meters send 30-minute readings to your supplier, providing accurate data on your energy consumption. This ensures businesses are billed accurately according to their actual usage.

  • Detailed data

    Data provided by half-hourly meters is highly detailed, allowing you to track the impact of any energy-saving measures you’ve introduced more succinctly. You can also see the exact times of day you are using the most energy and investigate accordingly.

  • Automatic meter readings

    Like smart meters, half-hourly meters send automatic meter updates to your supplier. This removes the hassle of manually taking meter readings and sending them on yourself, allowing you to focus your attention on your business.

  • Reduced rate tariffs when you switch

    The more accurate your meter readings, the easier it becomes to secure a better value business energy deal when the time comes to renew or switch suppliers.

While there are plenty of benefits to installing half-hourly meters, there are some downsides to consider, especially for smaller businesses. These include:

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    Cost of installation and maintenance

    Installing and maintaining half-hourly meters can be more expensive compared to traditional meters. There may be upfront costs associated with the installation of the metering equipment, as well as ongoing charges for meter operation and data transmission.

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    Data privacy

    Half-hourly metering involves the collection and transmission of detailed energy consumption data. Ensuring the privacy and security of this data is crucial to protect sensitive business information and comply with data protection regulations. Businesses must implement robust data security measures to safeguard against potential breaches, which can feel like a costly overhead to a smaller business.

Should my business switch to a half-hourly meter?

Energy-intensive businesses are advised to consider switching to half-hourly meters due to the cost savings and convenience they could yield. Indeed, If your business has an electricity demand of over 100 kW or more in three or more half-hour periods over a year, then you are legally required to install a half-hourly meter on site.

However, it may still be worth your while installing half-hourly meters, whether you are energy-intensive or not. Smaller businesses could benefit from switching to half-hourly tariffs due to the enhanced accuracy of the data. This enables them to monitor their energy usage more effectively and take steps to improve their business’ energy efficiency.

Reducing your carbon footprint both lowers your bills and enables you to meet the government’s environmental targets, making you eligible for rewards.

How are half-hour meters installed?

Sold on half-hourly energy meters and want to get one installed? Follow these steps:

  1. 1

    Contact your energy supplier

    Start by contacting your energy supplier and letting them know you require half-hourly metering. You can explain your rationale and requirements for half-hourly metering and go from there.

  2. 2

    Supplier assessment

    Your supplier will assess your business premises and inform you if its suitable for half-hourly meter installation. Factors such as location, existing regulations and your business infrastructure will affect their decision, but the likelihood is that your business will be eligible for half-hourly metering.

  3. 3

    Installation appointment

    Once you’re given the green light, your supplier will appoint a meter operator to install your half-hourly meter. You can decide on a date for installation, prepare the site according to instructions provided beforehand and await your appointment. On the scheduled date, qualified professionals will arrive at your premises and complete the installation.

The time it takes to complete the installation process can vary depending on factors such as scheduling availability, site readiness, and the complexity of the installation. Typically, the process can take several weeks from the initial assessment to installation.

The cost of installing a half-hourly meter can vary depending on factors such as the complexity of the installation, site-specific requirements, and any additional services provided by the MOP. The installation charges are typically borne by the end user, but in some cases, a business may be eligible for free installation. It’s worth checking with your provider whether this applies to your business.