Grid connection for electrification projects: where the months go

An electrification project replaces something that burned fuel with something that uses electricity: gas boilers with heat pumps, a diesel fleet with electric vehicles, a furnace or a process line with an electric one. Every one of those swaps pushes the site's electricity demand up, often to two or three times what the existing connection was built for. So before it is a heating, fleet or process project, it is a grid connection project.

This article is for the people running those projects: facility and energy managers, fleet operators building charging depots, industrial decarbonisation leads, and the developers behind charging hubs and new electric-intensive sites. It explains what grid connection and interconnection support actually involves for a demand connection, how the process runs in the UK and the US, and where projects lose months they did not need to lose.

Why an electrification project is a grid connection project first

The connection to a site was sized for the load the site had when it was built. A factory that ran gas-fired ovens and a small electrical supply has a connection sized for lights, motors and offices. Put electric ovens in and the supply is short by the size of the ovens.

The network operator sees the request the same way it sees any other large new load. It asks how much power, when, with what profile through the day, and whether the local network can carry it without reinforcement. If the answer is reinforcement, the timeline is set by the network, not by the project.

That is why the first question on an electrification project is not "which heat pump" but "what will the site draw at peak, and can the connection take it".

What interconnection support actually covers

Capacity check and feasibility. How much the existing connection can carry, how much headroom the local network has, and whether the site's new peak fits inside it. This is a desktop exercise with the network operator's data and the site's own metering. It tells you early whether you are looking at a simple upgrade or a new primary connection.

The application. Demand connections are applied for through the network operator's process, and the application now has to be complete and credible before it enters the queue. The support here is preparing the load profile, the single line diagram and the timeline in the form the operator wants, so the application is not returned.

The power quality assessments. The new loads are exactly the kind that disturb a shared network. Fast chargers and drives produce harmonics. Heat pumps, furnaces and compressors starting and stopping produce flicker. Large single-phase loads produce unbalance. In the UK the network operator can require assessments under the Energy Networks Association's engineering recommendations for each of these: G5/5 for harmonics, P28 for flicker and P29 for unbalance. Doing them before the application, rather than when the operator asks, is the single biggest time saver on a demand connection.

Protection and earthing. A bigger connection means higher fault current on site, so the existing protection settings and earthing design are checked and changed where needed. Our explainer on protection coordination covers what that involves.

Point of connection design. The transformer, switchgear, metering and cabling that join the site to the network, designed to the operator's standards so the operator will accept it.

Witnessing and energisation. The tests the operator wants to see before the new connection goes live, and the paperwork that follows.

Our guide to grid connection engineering for UK energy projects describes the same package from the generation side. The difference for electrification is the direction of the power and the kind of loads, and both change what the operator asks for.

The UK route

Applications go to the distribution network operator for the area, or to the transmission operator for the largest sites. From 1 June 2026, new guidance from the Energy Networks Association changed how larger demand connections, typically around 5 MVA and above, are assessed. An application is now expected to arrive with a signed letter of authority, heads of terms showing the commercial and land arrangements are agreed in principle, a site plan, a single line diagram of the proposed connection, and a preliminary timeline with a credible route to energisation. Applications that arrive without them may not enter the queue at all.

The intent is to stop speculative applications holding capacity that real projects need. The effect for an electrification project is that the engineering work that used to follow the application now has to come before it. A formal application typically takes the operator one to three months to answer with an offer. If reinforcement is needed, the construction of it is the long pole, and it can run to years.

The US route

In the US, large new loads connect through the local utility, and loads above roughly 20 MW are usually handled at the transmission level. The utility runs a sequence of studies: a feasibility study for a rough cost and timeline, a system impact study to identify the upgrades needed and who pays for them, and a facilities study to produce construction-level designs and firm costs. The customer supplies the location, the size in megawatts, the voltage and the in-service date, and the whole process runs from several months to several years depending on the upgrades.

Regulators are pushing utilities to connect large loads faster, and several regions have set up dedicated large-load processes. The engineering the customer has to bring is the same as in the UK: a load profile the utility can believe, a single line diagram, and power quality data for the equipment being installed.

Where the months go

Missing data. The application asks for a load profile and the project only has a nameplate total. Building a credible profile from the equipment schedules and operating pattern is a week's work if it is done early and a month's delay if the operator has to ask for it.

Late power quality surprises. The operator's engineer looks at the charger or furnace data, asks for a harmonic or flicker assessment, and the project discovers it needs filtering or a compensator it had not budgeted. Our article on why grid connection projects get delayed walks through how this happens on generation projects; on demand projects it is more common, because the loads are noisier.

Reinforcement. If the local network needs a new transformer or cable, the operator's timeline takes over. The engineering answer is to find out early, and to look at whether on-site storage or load management can bring the peak down to what the network can carry today.

Changing the load after the application. Adding chargers, changing the phasing plan or moving the in-service date can send the application back to the start of the queue. Size the connection for the final phase and phase the load inside it.

How to shorten it

1. Build the load profile before anything else. Peak, daily shape, seasonal shape, and how it grows through the project phases. Everything downstream is sized from it.
2. Run the power quality assessments before the application. Get the harmonic, flicker and unbalance data for the equipment you intend to install and assess it against the operator's limits. If it fails, the fix is designed into the project rather than bolted on.
3. Apply for the final phase. One application for the full eventual load, phased inside it, is faster than three applications.
4. Look at the alternatives at the same time. Battery storage to shave the peak, load management to shift it, and where a generator sits next door, a private wire that bypasses the queue altogether. The right answer is often a smaller connection plus one of these.

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Is your site's connection the limit on your electrification plan? Renewable Energy & Drives prepares demand connection applications, runs the power quality and protection studies, and designs the point of connection for industrial sites, depots and charging hubs in the UK and the US. Start a consultation, email sales@renewable-d.com, or call +44 116 279 6131 (UK) or +1 414 562 6559 (US).