In the United Kingdom, the regional electricity network is managed by a group of companies known as Distribution Network Operators (DNOs). These operators are responsible for the maintenance and distribution of electricity across various regions. The primary DNOs in the UK are:

1. Scottish and Southern Electricity Networks (SSEN): Responsible for the regions of northern Scotland and southern England.
2. Scottish Power Energy Networks (SPEN): Manages the networks in southern Scotland, North Wales, and Merseyside.
3. Northern Powergrid: Covers the northeast of England and Yorkshire.
4. Electricity North West (ENW): Serves the northwest of England.
5. Western Power Distribution (WPD): Active in the Midlands, southwest England, and South Wales.
6. UK Power Networks (UKPN): Manages networks in London, the southeast, and eastern England.

Additionally, the National Grid manages as ESO (electricity system operator) (NGESO) the high-voltage network in England and Wales and maintains connections with Scotland and other countrie.

Eniris supports the reading of energy meters installed via metering companies:

1. Siemens Metering Services: Offers a range of meter services, including installation and maintenance.
2. SSE Metering: A division of SSE, specializing in the installation and management of energy meters.
3. Lowri Beck: Provides installation and reading services for energy meters, including smart meters.
4. Morrison Data Services: Offers meter reading and management services.
5. Trilliant: Specializes in smart meter solutions and related network services.
6. Calisen: Focuses on the management and installation of smart meters and related services.
7. Smart Metering Systems (SMS): Delivers comprehensive services for the installation and management of smart meters.

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