DNO vs IDNO vs ICP – What’s the Difference?

DNOs (Distribution Network Operators), IDNOs (Independent Distribution Network Operators), and ICPs (Independent Connection Providers) all play different roles in connecting projects to the UK electricity grid. Understanding how they interact is essential for developers looking to reduce costs, accelerate timelines, and optimise their connection strategy.

Quick Explanation

• DNO: Owns and operates the regional electricity network and issues connection offers
• IDNO: Can adopt and operate new network assets and sometimes provide alternative connection routes
• ICP: Designs and builds the connection infrastructure (often more efficiently than DNOs)

What Does a DNO Do?

DNOs are responsible for managing the local electricity distribution network. They:

• Assess grid capacity
• Issue connection offers
• Define required reinforcement works
• Maintain and operate the network

In most cases, your project must engage with a DNO to secure a connection agreement.

What Does an IDNO Do?

IDNOs are licensed network operators that can adopt and operate new electrical infrastructure.

They:

• Take ownership of contestable assets
• Operate and maintain networks long-term
• May offer alternative connection routes via their networks

What Does an ICP Do?

ICPs (such as Renewable Power Connections Ltd) design and construct grid connections.

They:

• Deliver contestable works
• Build substations and cabling
• Manage design and compliance
• Often reduce costs and timelines compared to DNO delivery

How They Work Together

1. The DNO provides the connection offer
2. An ICP designs and builds the connection infrastructure
3. An IDNO may adopt the assets once completed

This model allows developers to optimise both delivery and long-term ownership.

Why This Matters for Your Project

Choosing the right combination of DNO, IDNO, and ICP can:

• Reduce capital costs
• Accelerate project timelines
• Improve long-term asset management

Industry Insight

Many developers assume the DNO must deliver all connection works. In reality, using a NERS accredited ICP and involving an IDNO can significantly improve project efficiency and commercial outcomes.

FAQs

Do I have to use a DNO for construction?
No. While the DNO issues the connection offer, much of the work can be completed by an ICP.

What are contestable works?
These are parts of the connection that can be designed and built by an ICP instead of the DNO.

When should I consider using an IDNO?
When you want to transfer ownership of assets or explore alternative connection routes.

What is a NERS accredited ICP?
A contractor accredited to design and build electrical connections to UK standards.

Planning a project?  Speak to a NERS accredited ICP like Renewable Power Connections Ltd.