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Grid connections · Reviewed 11 September 2026

Power available is not one status.

A dated evidence framework for tracing a data-centre load from requirement and application through studies, agreements, network works and energisation.

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Evidence sequence

Six checks before relying on a connection claim

  1. Step 1

    Freeze the load definition

    Record the applicant, site, initial and ultimate demand, IT and facility load, phase dates, ramp, load factor, power factor, harmonics, ride-through, flexibility and onsite generation. Version every change.
  2. Step 2

    Identify the connection route

    Confirm whether each phase is expected to use distribution or transmission and name the utility, network owner, system operator and application owner. Do not transfer milestones between routes.
  3. Step 3

    Separate status from capacity

    Record the exact stage—enquiry, accepted application, study, offer, executed agreement, network delivery, commissioning or energisation—and retain the dated document that supports it.
  4. Step 4

    Map works, rights and money

    Split utility, network and customer works; then capture land rights, easements, securities, deposits, upgrade costs, cancellation exposure, tariff terms and whether any rights can be assigned.
  5. Step 5

    Build a dependency programme

    Join studies, consents, design approvals, equipment procurement, outages, construction, testing and energisation to accountable owners, prerequisites and evidence dates. Keep alternatives explicit.
  6. Step 6

    Revalidate at every decision

    Refresh the load basis, study assumptions, offer conditions, delivery dates, costs and change notices before land commitment, finance approval, procurement and notice to proceed.

Status ladder

Do not compress the route into available or unavailable

01

Requested

An enquiry or application proves that a request exists. It does not prove that studies are complete, capacity is reserved or the target date is deliverable.
02

Studied

A study answers its stated load, network model and date. Confirm the assumptions, required upgrades, validity period and what must happen next.
03

Offered or contracted

Read the executed terms, milestones, securities, conditions, change rights and responsible entity. An agreement is not evidence that physical works are complete.
04

Energised

Confirm commissioned capacity, voltage, redundancy, operating limits and phase. Do not extend evidence for one energised phase to future capacity.

Decision record

Join every claim to a document and owner

Evidence set

Load basis

Minimum record

Applicant, site, MW by phase, operating profile, power quality, flexibility and onsite generation

Accountable input

Owner and electrical engineer

Evidence set

Route and parties

Minimum record

Distribution or transmission path, utility, network owner, RTO/ISO or NESO role, application owner and authority to disclose

Accountable input

Project lead and connection adviser

Evidence set

Connection status

Minimum record

Application reference, study scope and results, offer, executed agreement, queue or milestone record and effective date

Accountable input

Contracting party and network counterparty

Evidence set

Scope and cost

Minimum record

Responsibility matrix, network upgrades, customer works, securities, deposits, tariffs, cancellation terms and cost assumptions

Accountable input

Commercial lead and legal counsel

Evidence set

Land and delivery

Minimum record

Substation and cable land, easements, permits, long-lead equipment, construction interfaces, outages, tests and energisation plan

Accountable input

Development, planning and delivery leads

Evidence set

Decision control

Minimum record

Open conditions, material-change triggers, evidence expiry dates, downside case and named approval owner

Accountable input

Investment or procurement decision-maker

Market checks

Use the rule set in force for the actual route

Great Britain

Record the current reform position

NESO manages transmission connection contracts with Transmission Owners and publishes the connection journey and offer process. As of 11 September 2026, Ofgem's data-centre demand-connection fee and progress milestones were proposals in an open consultation, not final rules. Check the current position and the responsible network before relying on any milestone or cost.
Ofgem reform update
United States

Trace the regional and retail layers

FERC's June 2026 action required six regional grid operators to address large-load application, study, cost, co-location and flexibility rules, while recognising that regional structures differ. Identify the state commission, serving utility, transmission owner and RTO or ISO involved, then verify the applicable tariff and agreement.
FERC large-load update

Build the project team

Find the capability, then verify the appointment

Use the directory to research organisations that publish grid-connection, high-voltage, transformer, engineering or delivery capabilities. A listing is not evidence that a firm controls an application, can assign capacity, has a current production slot or is appointed to your project.

Grid Connections & High Voltage suppliersTransformers & Switchgear suppliers
Site & PlanConnect & PowerSubmit a grid requirement

Primary references

Sources used for this guide

National Energy System Operator — Connections
Official Great Britain transmission-connection hub covering NESO's role, the application journey, offer process, portals, reports and current reform work.
Ofgem — Data-centre demand connection reform
The regulator's 29 July 2026 update describes proposed data-centre commitment fees and progress milestones; the consultation was still open when this guide was reviewed.
Federal Energy Regulatory Commission — Large load integration
FERC's June 2026 orders address regional application and study processes, transmission-cost transparency, co-location and flexible large loads.
US Department of Energy — Electricity rate designs for large loads
Official discussion of cost allocation, stranded-asset risk, resource adequacy, contract structures and the diverse operating needs of large-load customers.
US Department of Energy — National Transmission Needs Study
The 2026 draft study identifies new load interconnection, reliability and congestion as drivers of additional transmission need without replacing regional planning processes.

Sources checked 11 September 2026. Connection rules, tariffs, studies and project facts change; verify the current position with the authorised counterparties for the exact site and load.