Here is how a new electricity connection usually goes.
You need power for a development. You find out who owns the network in your area, you apply, you wait, and eventually a quote arrives with a price and a date on it. You look at both, wince slightly, and accept, because as far as you know there is nothing else to accept. The network is a monopoly. They own the cables. What choice do you have.
That last assumption is the expensive part, and a very large number of people hold it.
You do have a choice. Not over all of it, but over a meaningful portion of it, and often the larger portion. Understanding which part is which is one of the few genuinely useful things you can learn about utility connections, because it changes both what you pay and who controls your programme.
What actually opened up, and when
Until the early 2000s the assumption was correct. If you wanted a connection, the regional network operator did the work, at their price, on their schedule.
Then Ofgem opened the connections market to competition. The logic was straightforward: some of the work involved in a new connection is safety critical and can only sensibly sit with the licensed network owner, but a lot of it is ordinary construction and design work that any properly accredited company can carry out to the same standard.
So the work was split into two categories, and one of them was opened to competition.
Non contestable works stayed with the network operator. Determining the point of connection. Designing and delivering any reinforcement of the wider network. Making the final live connection and energising. These are theirs, exclusively, and no amount of shopping around changes that.
Contestable works were opened up. Design of the connection, cable laying and jointing, ducting, civils, substation installation, the physical infrastructure that sits between the network and your site. An accredited Independent Connection Provider can do all of this in competition with the DNO.
The accreditation that permits it is NERS, the National Electricity Registration Scheme, administered independently by Lloyd's Register. It is not a self declared badge. An ICP can only work within the scope its accreditation actually covers, and that scope is publicly checkable.
So who does what, in plain terms
Three acronyms come up constantly and people mix them up, which does not help.
- DNO. Distribution Network Operator. Owns and runs the regional electricity network. There are fourteen licence areas across England, Scotland and Wales. They handle non contestable works. They can also do the contestable works if you want them to, which is the default most people fall into.
- ICP. Independent Connection Provider. An accredited contractor that designs and builds new connections. Competes on the contestable works. Does not own or operate a network.
- IDNO. Independent Distribution Network Operator. Owns and operates networks like a DNO does, but nationally rather than in one region. This is the one that matters commercially.
One more that gets confused with all of the above: your electricity supplier is the company that sells you the units and sends your bill. Octopus, EDF, British Gas. They have nothing to do with building your connection. Plenty of people phone their supplier about a new connection and get nowhere, because they have called the wrong organisation entirely.
The commercial part most developers miss
This is the bit worth reading twice.
If the DNO builds your connection, only the DNO can adopt it. That is simply how it works. The completed network becomes theirs, you hand it over, and that is the end of the transaction.
If an accredited ICP builds your connection, it can be adopted by either the DNO or an IDNO. And an IDNO will typically pay you for it.
That payment is called an asset value, or asset adoption value. The logic behind it is not complicated. A new electricity network is a long term revenue generating asset. Whoever owns it collects distribution charges from it for decades. Traditionally, developers built that asset and then simply gifted it to the DNO for nothing. The IDNO model exists because that asset has a value, and someone is willing to pay you for it.
The sum depends on the scale of the network, the expected consumption across it, and whether it is metered at low or high voltage. On a single small connection it may be modest. On a multi plot residential scheme or a commercial development, it can take a serious bite out of your infrastructure cost, and a good ICP will include it in the quotation so you can see the net figure rather than the gross one.
This option does not exist on the DNO route. Not because anyone is being difficult, but because the DNO is not in the business of bidding for assets it would receive anyway.
But is an IDNO network as good?
This question comes up every time, and it deserves a straight answer rather than reassurance.
DNOs and IDNOs are both licensed and regulated by Ofgem. The licence conditions that apply to IDNOs mean customers connected to an IDNO network are entitled to the same level of service and the same guaranteed performance standards as customers on a DNO network. Both are equally responsible for operating and maintaining the network they adopt.
End users can still choose any electricity supplier they like. Being on an IDNO network does not lock residents or tenants into anything.
The practical difference for you, once the network is live, is nothing. The difference is in what you paid, how quickly it got built, and who you dealt with while it was being built.
When the ICP route genuinely wins
It is not automatically the right answer for every job, and anyone telling you otherwise is selling rather than advising.
It works well when there is meaningful on site infrastructure. Cabling, ducting, civils, a substation. The bigger the contestable portion, the more there is to compete on.
It works well when your programme matters. This is often the real argument rather than price. DNO delivery is scheduled around their own workload and resourcing across thousands of customers. An ICP builds to your construction programme. Ofgem's own connections review found developers facing delays of years beyond their original connection offer, with some projects reporting cost inflation of up to 200 percent as a result. Ofgem described this as an asymmetry of risk, where developers carry the consequences of delay while networks face minimal penalty for it.
It works well when an asset value would be material. Multi plot schemes, commercial developments, EV charging infrastructure, anything where the network being built is substantial.
It works less well when the job is genuinely tiny. A short low voltage connection with almost no infrastructure has very little contestable content to compete on, and the DNO may deliver it perfectly quickly at a price nobody can meaningfully undercut.
It works less well when reinforcement dominates the scheme. If most of your cost and most of your timeline sits in non contestable network reinforcement, that portion is with the DNO regardless of who you appoint. An ICP can run it in parallel and manage it for you, but cannot do it instead of them.
What using an ICP actually looks like
The process is not more complicated than going direct. It is mostly the same process with a different party doing more of the work.
You brief the ICP on your site and load. They assess feasibility and confirm what your connection needs. They apply to the DNO for the point of connection and lodge the non contestable works early, so those run alongside everything else rather than landing at the end. They design the connection to adoptable standards. They build the contestable works. The DNO or IDNO adopts and energises.
The key detail is that the non contestable works do not disappear. The DNO stays involved throughout, and any competent ICP manages that relationship on your behalf rather than leaving you to chase two organisations at once.
The honest summary
Going to the DNO is not a mistake. It is a default, and for some jobs it is the right default.
The mistake is not knowing it was a default. Accepting a quote and a delivery date because you believed no alternative existed, when a competitive quote on the contestable works and an asset value payment on the completed network were both available to you for the cost of one phone call.
Before you accept a connection offer, it is worth asking two questions. Which parts of this quote are contestable. And what would this look like with an IDNO adopting the network instead.
If the answers make no difference, accept the DNO offer with confidence, knowing you checked. If they do make a difference, you have just found money and time you did not know you had.
Have a DNO quote in front of you?
Air Utilities is a NERS, GIRS and WIRS accredited Independent Connection Provider. Send it over with your site details and we will tell you plainly whether the ICP route would do better on price, programme, or both.