Operating Harlow building. Base 8.8 MW and expandable 10 MW ratings are retained separately; June 2026 generator permit and campus fibre evidence add environmental and connectivity detail.
Read overviewKao Data KLON-02
Harlow, United Kingdom
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13 cited sources · 7 utility and planning categories reviewed.
Review evidence and gapsObtain the executed demand-connection agreement, legal network counterparty, campus import limit and building allocation; reconcile feed roles without summing redundant capacity.
Open the full checkOverview
Operating Harlow building. Base 8.8 MW and expandable 10 MW ratings are retained separately; June 2026 generator permit and campus fibre evidence add environmental and connectivity detail.
- Developer / applicant
- Kao Data
- Owner
- Not verified
- Operator
- Kao Data
Planning and delivery status
Operator announced completion, commissioning and operation on 28 November 2023. The date is the confirmed opening announcement.
Stage source: 28 Nov 2023Project intelligence. This record does not establish that the land or facility is available to acquire.
POWER STUDY
Power
What the power evidence establishes
The site-specific connection scope has not been established for this record.
Power classDNo qualifying rung
No same-scope, dated import-MVA rung has document-seen or better verification. Nearby infrastructure, IT MW and marketing claims cannot upgrade the class.
The class describes published documentary evidence at its stated date. It does not prove current contractual rights, transferability or an energisation date.
Class describes evidence maturity. Public records do not prove current contractual rights, transferable capacity or an energisation date. This record has not received a complete power study review.
Read the rules and verification levels01
Capacity ladder and evidence
Each rung is a separate MVA claim for its stated site or phase. A missing rung is unknown.
01
Applied
Unknown
Not established from the public records reviewed.
What applied mva is evidenced for the assessed site scope?02
Offered
Unknown
Not established from the public records reviewed.
What offered mva is evidenced for the assessed site scope?03
Accepted / contracted
Unknown
Not established from the public records reviewed.
What accepted or contracted mva is evidenced for the assessed site scope?04
Energised
Unknown
Not established from the public records reviewed.
What energised mva is evidenced for the assessed site scope?02
Conflicts and scope comparisons
No conflicting pair is recorded. This does not establish that all public statements have been reconciled.
03
United Kingdom grid context
Network publications frame the claim. They do not allocate capacity to this site.
No country context entries have been linked to this site. Applicable policy, capacity information and reinforcement dependencies need review.
Country coverage: prepared sources; site-level research not extended. View all country sources and refresh schedules.
04
Derived energisation window
Earliest plausible yearUnknown
Latest plausible yearUnknown
The observed inputs do not establish a bounded delivery range. Open bounds stay unknown.
Rule
Use only a same-scope, dated, document-verified capacity rung and an applicable duration to energisation published by the observed site operator. The named process operator and a named source publisher must match that operator. Earliest year is the maximum of stage date plus minimum duration and each evidenced readiness constraint. Latest year is the maximum of stage date plus maximum duration and each published upper constraint only when every required input is bounded. An offer-processing duration is excluded. A missing required input leaves the affected bound unknown; no padding or contractual delivery promise is inferred.
No observed inputs establish this result.
Dependencies driving the range
- Connection-dependent reinforcement scope and completion dates: unknown.
- Grid-works planning status and programme: unknown.
- Applicable connection-policy conditions and programme: unknown.
What the earliest case requires
- Connection-dependent reinforcement scope and completion dates introduces no later constraint than the earliest case; this remains unverified.
- Grid-works planning status and programme introduces no later constraint than the earliest case; this remains unverified.
- Applicable connection-policy conditions and programme introduces no later constraint than the earliest case; this remains unverified.
Missing inputs leave the range open
- A dated, document-verified import-MVA rung for the assessed scope.
- An applicable duration from the evidenced stage to energisation, published by and matched to the observed site operator, rather than an offer-processing target.
- Connection-dependent reinforcement scope and completion dates
- Grid-works planning status and programme
- Applicable connection-policy conditions and programme
05
Indicative HV and connection capex
Unknown
Rule and scope
Sum each published complete scope quantity multiplied by the matching published benchmark minimum and maximum. Configuration, voltage, route type, unit, country applicability, currency and explicit price base year must match. No assumed route length, transformer count, exchange rate, inflation, fee uplift or partial index is inserted. The result is an indicative benchmark band, not an operator quotation or contractual connection charge.
No observed inputs establish this result.
Scope questions
- Obtain a published complete connection scope with voltage, configuration and measured quantities.
- Establish that every necessary connection-work component is included in the published scope.
- Identify network and customer works, upstream reinforcement, land and wayleaves, taxes, fees, securities, contingency and the price base.
06
Alternatives and policy exposure
Behind-the-meter generation
Unknown
Not established from the public records reviewed.
What behind-the-meter generation is evidenced, and at what scope?Planning / policy requirement
Unknown
Not established from the public records reviewed.
Does the applicable planning or connection policy require behind-the-meter generation?Battery storage
Unknown
Not established from the public records reviewed.
What battery storage is evidenced, and at what scope?Planning / policy requirement
Unknown
Not established from the public records reviewed.
Does the applicable planning or connection policy require battery storage?Private wire
Unknown
Not established from the public records reviewed.
What a private wire is evidenced, and at what scope?Planning / policy requirement
Unknown
Not established from the public records reviewed.
Does the applicable planning or connection policy require a private wire?Gas
Unknown
Not established from the public records reviewed.
What gas supply or generation is evidenced, and at what scope?Planning / policy requirement
Unknown
Not established from the public records reviewed.
Does the applicable planning or connection policy require gas supply or generation?Connection claim against current policy
Unknown
Not established from the public records reviewed.
Does the published connection claim meet the policy applicable to its application date, location and agreement status?07
Open questions for a Reality Check
Generated from unknown fields, missing derivation inputs and unresolved evidence. The questions identify the documents or specialist checks needed next.
60 questions to resolve
- Which TSO or DSO is responsible for this demand connection?
Not established from the public records reviewed.
- What is the operator-confirmed connection substation or circuit?
Not established from the public records reviewed.
- What voltage level is specified for the demand connection?
Not established from the public records reviewed.
- What are the evidenced site and connection-point coordinates, and their calculated straight-line distance?
Not established from the public records reviewed.
- What grid route length is published, and for which circuit?
Not established from the public records reviewed.
- What applied mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the applied connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the applied connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.applied?
Verification has not been established.
- What offered mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the offered connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the offered connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.offered?
Verification has not been established.
- What accepted or contracted mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the accepted connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the accepted connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.accepted?
Verification has not been established.
- What energised mva is evidenced for the assessed site scope?
Not established from the public records reviewed.
- What is the effective date of the energised connection evidence?
Not established from the public records reviewed.
- Which buildings or phases does the energised connection evidence cover?
Not established from the public records reviewed.
- What evidence level can be supported for capacityLadder.energised?
Verification has not been established.
- What connection agreement type and current status are documented?
Not established from the public records reviewed.
- Does the agreement impose phased import-capacity limits?
Not established from the public records reviewed.
- What flexibility or curtailment obligations apply?
Not established from the public records reviewed.
- What on-site generation obligations apply?
Not established from the public records reviewed.
- What securities are required, posted and still valid?
Not established from the public records reviewed.
- What connection longstop or milestone dates apply?
Not established from the public records reviewed.
- What is the published IT load in MW?
Not established from the public records reviewed.
- On what electrical basis is the IT load in MW stated?
Not established from the public records reviewed.
- Which phase or campus does the IT load in MW cover?
Not established from the public records reviewed.
- What is the published facility load in MW?
Not established from the public records reviewed.
- On what electrical basis is the facility load in MW stated?
Not established from the public records reviewed.
- Which phase or campus does the facility load in MW cover?
Not established from the public records reviewed.
- What is the published import capacity in MVA?
Not established from the public records reviewed.
- On what electrical basis is the import capacity in MVA stated?
Not established from the public records reviewed.
- Which phase or campus does the import capacity in MVA cover?
Not established from the public records reviewed.
- What operator-published connection-to-energisation duration applies to this site and connection stage?
An application-to-offer processing target is not an energisation duration.
- Which reinforcements does the connection depend on, and what dates are published?
Not established from the public records reviewed.
- Which grid works require planning, and what is their current consent status and dated programme?
Not established from the public records reviewed.
- Which connection-policy conditions apply, and when could they be satisfied?
Not established from the public records reviewed.
- What complete connection scope is published: bays, stations, voltage, circuits, route lengths and underground or overhead configuration?
Not established from the public records reviewed.
- Is the published connection scope complete enough to match every component to a sourced benchmark?
Not established from the public records reviewed.
- What behind-the-meter generation is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require behind-the-meter generation?
Not established from the public records reviewed.
- What battery storage is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require battery storage?
Not established from the public records reviewed.
- What a private wire is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require a private wire?
Not established from the public records reviewed.
- What gas supply or generation is evidenced, and at what scope?
Not established from the public records reviewed.
- Does the applicable planning or connection policy require gas supply or generation?
Not established from the public records reviewed.
- Does the published connection claim meet the policy applicable to its application date, location and agreement status?
Not established from the public records reviewed.
- Which checked country-grid sources and location-specific constraints apply to this connection?
No country-context relationship has been established for this record.
- Identify network and customer works, upstream reinforcement, land and wayleaves, taxes, fees, securities, contingency and the price base.
Connection-cost scope question.
- Resolve the energisation input: A dated, document-verified import-MVA rung for the assessed scope.
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: An applicable duration from the evidenced stage to energisation, published by and matched to the observed site operator, rather than an offer-processing target.
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: Connection-dependent reinforcement scope and completion dates
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: Grid-works planning status and programme
This missing input leaves an energisation bound unknown.
- Resolve the energisation input: Applicable connection-policy conditions and programme
This missing input leaves an energisation bound unknown.
- Obtain a published complete connection scope with voltage, configuration and measured quantities.
This scope or reference gap prevents a complete indicative connection capex band.
- Establish that every necessary connection-work component is included in the published scope.
This scope or reference gap prevents a complete indicative connection capex band.
Use these questions to scope a Power Reality Check.
Request an assessment of this record and the evidence needed next. Share only public information or documents you are authorised to provide.
Request a Reality CheckEarlier capacity notes and source context
10 MW ITProject capacity
KLON-02 expandable design/2023 opening headline. Operator described 8.8 MW base expandable to 10 MW; current undated campus page still lists 8.8 MW. Neither is spare capacity or utility import.
Published claimProject source record8.8 MW ITCurrent campus-page building rating
KLON-02 operating rating on undated Harlow page; the 2023 design explanation identifies expansion to 10 MW.
Published claimCapacity sourceImport rights and connection evidence
HDR's March 2025 permit submission describes the campus London Road customer substation and three 33 kV A/B/C feeds connected to Harlow West. A and B are each described as able to carry the full load; these are redundant arrangements, not additive import rights. The document uses UK Power Distribution and UK Power Networks names; the legal connection counterparty and KLON-02 allocation remain unverified. The operator's 8.8 MW base/10 MW expandable IT ratings are separate.
IT load, facility demand, import capacity and equipment ratings retain their stated scope. A published figure does not establish spare or transferable supply.
Planning & utilities
7 of 10 categories contain evidence. Each status applies to its specific claim.
Grid & import rights
Partial evidenceHDR's March 2025 permit submission describes the campus London Road customer substation and three 33 kV A/B/C feeds connected to Harlow West. A and B are each described as able to carry the full load; these are redundant arrangements, not additive import rights. The document uses UK Power Distribution and UK Power Networks names; the legal connection counterparty and KLON-02 allocation remain unverified. The operator's 8.8 MW base/10 MW expandable IT ratings are separate.
Sources & next check
Fibre & dark fibre
Partial evidenceZayo's June 2023 agreement describes lit and dark fibre for Harlow with two planned points of presence at KLON-01. euNetworks' January 2021 announcement identifies a direct campus link serving the Cambridge research corridor. This establishes named carrier routes to the campus, not verified diverse entrances or dark-fibre availability at KLON-02.
Sources & next check
Ownership & development control
Partial evidenceThe Environment Agency's June 2026 permit variation names Harlow Operations Limited as the permitted operator and assesses operator control for regulated activities. This is a useful operating-entity link but does not establish the registered property owner, lease terms or independent development rights; owner remains null.
Sources & next check
Land, footprint & access
Partial evidenceKao's KLON-02 design account describes roughly 3,400 m² of technical space across four suites and a brownfield development; the current Harlow page describes a 15-acre campus. These are different building/campus measures and do not establish net developable land or an independently available parcel.
Sources & next check
Flood, ground & environment
Partial evidenceThe Environment Agency issued EPR/WE4588AB/V002 on 3 June 2026. The variation covers campus standby generation rising from eight to 25 sets, with four additional KLON-02 generators using SCR; it also describes oil interceptors and surface-water controls. The decision retains air-quality management/monitoring improvement requirements and discusses incomplete historic baseline information. Permit issue does not establish closure of every condition, current emissions performance or flood clearance.
Sources & next check
Water, cooling & heat
DocumentedMEIT describes KLON-02 adiabatic free cooling with mechanical assistance, hot-aisle containment and an estimated design PUE below 1.264. Its stated design scope covers approximately 3,400 m² and four suites. These are building-specific design claims; measured PUE, water consumption, supply/discharge permissions and a heat offtaker are not established.
Sources & next check
Programme & delivery
DocumentedKao announced KLON-02 complete, commissioned and operational on 28 November 2023. Its April 2023 account explicitly described an 8.8 MW base expandable to 10 MW, while the current campus page lists 8.8 MW. The June 2026 generator variation is a later environmental change; it is not a new whole-building opening or evidence that the full expandable rating is now occupied.
Sources & next check
Not assessed
Planning & decisionsLand-use zoningDemand & location fit
Evidence still needed
- Planning & decisions
A current planning decision, conditions and any appeal or court proceedings still need to be checked.
- Land-use zoning
The site boundary has not been matched to the current adopted zoning map and data-centre use policy.
- Demand & location fit
Customer geography, latency, cloud or exchange nodes and a supported use case need project-specific evidence; national growth alone is insufficient.
Project team
Appointments are limited to the project, phase and scope supported by each source.
Main contractor
JCA EngineeringOther projects
Principal contractor for KLON-02, appointed after delivery of KLON-01.
Appointment sourceArchitect
Marchini Curran AssociatesOther projects
KLON-02 design from inception to completion in 2023.
Appointment sourceEngineering consultant
MEIT ConsultantsOther projects
MEP design through stages 2–4 for the client, then stage 5 after novation to JCA.
Appointment source2025 campus environmental-permit variation submission, including KLON-02 standby-generator additions; not a full-building MEP appointment.
Appointment sourceUnlisted roles have no project-specific appointment recorded.
Sources
Publication dates are shown where known. Review dates do not establish approval or commissioning.
- Kao Data: KLON-02 now operationalkaodata.com · 28 Nov 2023
- JCA: KLON-02 principal contractorjca.co.uk · 11 Oct 2022
- MEIT: KLON-02 engineering scopemeit.uk.com · Publication date unstated
- Marchini Curran: Kao Park architecturemc-a.co.uk · Publication date unstated
- Kao Data: current Harlow building capacities and campus specificationkaodata.com · Publication date unstated
- Kao Data: KLON-02 base capacity and expansion designkaodata.com · 25 Apr 2023
- Environment Agency: Harlow permit variation issuedgov.uk · 3 Jun 2026
- Environment Agency: EPR/WE4588AB/V002 variation and consolidated permitassets.publishing.service.gov.uk · 3 Jun 2026
- Environment Agency: EPR/WE4588AB/V002 decision documentassets.publishing.service.gov.uk · 3 Jun 2026
- HDR: Harlow permit variation non-technical summary submitted to the Environment Agencyconsult.environment-agency.gov.uk · 31 Mar 2025
- HDR: Harlow site condition report submitted to the Environment Agencyconsult.environment-agency.gov.uk · 31 Mar 2025
- Zayo: Harlow lit and dark-fibre agreement and KLON-01 points of presencezayo.com · 26 Jun 2023
- euNetworks: Cambridge research network and direct fibre to Harlow campuseunetworks.com · 11 Jan 2021
Original documents and maps retain their rights. Public access does not grant commercial redistribution rights.