DNO or ICP? Understanding Your Grid Connection Delivery Options

If you're developing solar, battery storage, a hybrid scheme or any other piece of energy infrastructure, the grid connection is where the project is usually won or lost. It drives capital cost, it sets the critical path, and in a growing number of cases it decides whether the scheme is viable at all.

So it's worth asking a question that many developers never get around to: do you actually know what options you have for delivering your grid connection? For most organisations the answer has been to apply to the local Distribution Network Operator and work with whatever comes back. That's a legitimate route. It just isn't the only one.

The two routes, side by side

Broadly, a new connection or a capacity upgrade can be delivered one of two ways.

An Independent Connection Provider (ICP) is an accredited company that designs and builds connection works in place of the DNO. An Independent Distribution Network Operator (IDNO) is the Ofgem-licensed operator that adopts the finished network and runs it long term. The two usually work together: the ICP builds, the IDNO owns and operates.

That's why IDNO networks turn up so often on new-build estates, industrial parks and logistics developments. Those networks were built competitively by a contractor working for the developer, then adopted by an IDNO. If you're installing on a site like that today, the application goes to the IDNO, not the regional DNO, which we cover in detail on our IDNO applications page.

Competition in Connections isn't new

Competition in Connections (CiC) has been part of the UK electricity market for many years. It operates inside established industry and regulatory frameworks, and accredited ICPs are required to meet the relevant technical, safety, quality and adoption standards before they can build anything that will be adopted onto a licensed network.

This is worth stating plainly, because the instinct with anything unfamiliar is to assume it carries extra risk. It doesn't. Choosing a competitive route is not a compromise on standards. It's the introduction of competition and choice into a process that has historically had neither, and where it works well it can mean better communication, faster delivery, smarter technical solutions, tighter cost control and more certainty about who carries which risk.

What it does introduce is commercial and interface complexity. More parties means more contracts, more programme dependencies and more places for something to fall between two organisations. That's manageable, but it needs managing deliberately.

Contestable and non-contestable: the split that matters

Not all of a connection can be competitively delivered. The works split into two categories:

• Contestable works can be carried out by an accredited ICP: cabling, ducting, civils, substation construction and the on-site distribution infrastructure.
• Non-contestable works can only be done by the DNO: the actual connection to its existing network, and any reinforcement of that network needed to accommodate you.

This matters for two reasons. First, if the constraint on your project is network reinforcement, going competitive won't remove it, that scope stays with the DNO either way. Second, when you compare a DNO quote against an ICP proposal, you need to be certain both prices cover the same scope. A cheaper-looking ICP number that excludes the non-contestable element isn't cheaper, it's incomplete.

The connection is only part of the project

One of the most consistent sources of delay we see has nothing to do with which route you choose. It's that the grid connection and the on-site infrastructure get treated as two separate projects.

Your connection scope might involve substations, cabling and network infrastructure off site. Your project scope might involve transformers, HV and LV infrastructure, switchgear, and the solar, BESS or EV charging equipment itself. When those elements are designed and delivered by different organisations, on different programmes, with unclear interfaces, the result is predictable: the connection is ready and the site isn't, or the site is ready and the connection isn't.

The test to apply is simple. When the grid connection is energised, will the project actually be ready to use it? If you can't answer that with confidence, the delivery strategy needs work regardless of who's building the connection.

What Connections Reform changes

The way connections are managed is changing too. Connections Reform is pushing the industry toward a more strategic approach, with greater focus on projects that are genuinely ready to progress and aligned with future system needs, rather than projects that simply joined the queue early.

For developers, that raises the value of three things: early technical development, demonstrable project readiness, and a clear delivery strategy. Speculative queue positions are worth less than they were. Evidence that a scheme is real, technically developed and deliverable is worth more.

It also reinforces the point above: securing a connection offer is no longer the finish line. Understanding how you'll deliver that connection, and how it fits the wider project programme, is becoming as important as getting the offer in the first place.

So what should developers actually do?

Take a step back and ask whether the default approach is the right approach for this particular project. In practice, that means:

• Do the technical work early. Understand the likely connection voltage, point of connection and known constraints before you commit design or planning spend. Our £195 Grid Connection Site Assessment exists for exactly this, and full feasibility studies go further for larger schemes.
• Compare routes on the same scope. If you're weighing a DNO quote against a competitive proposal, make sure both cover contestable and non-contestable works, and be clear on who adopts the network afterwards.
• Read the offer properly. Connection offers carry cost, capacity, constraint and liability terms that are easy to accept without fully understanding. Our connection offer review service exists because those documents reward careful reading.
• Plan delivery alongside the connection. Align design, procurement and commissioning to one programme, not two, whoever is building the works.

Where we fit

To be clear about our own role: we handle grid connection applications, connection strategy and offer review. We submit to all six regional DNOs and to the major IDNOs, and we review the offers that come back so you understand what you're being asked to accept.

We're not an ICP and we don't carry out connection works, civils or construction ourselves. What we will do is tell you honestly when a project looks worth taking to the competitive market rather than straight down the incumbent DNO route, and make sure the application and the offer are sound whichever way you go.

If you're at the front end of a project and unsure which route makes sense, start with a site assessment or look at the full grid connection journey to see where each stage fits. For new connections and capacity upgrades specifically, our new connections page covers the application side in more detail.