TXT In plain English
Company description
NATIONAL ENERGY SYSTEM OPERATOR LIMITED is a UK company whose Companies House status is “Active” and whose registered company type is “Private Limited Company”. Incorporated on 16 October 2017; registered for 8 years; registered office reported in WOKINGHAM, ENGLAND. Its primary declared activity is 96090 · Other service activities n.e.c..
This BritDB profile also contains linked public records: 2 PSC records, 45 procurement records. This description is assembled from public data, is not a reliability assessment, and should be checked against the cited sources before a legally significant decision.
Web facts are never added from a name match alone. Internet enrichment requires the exact Companies House ID in Wikidata, and ambiguous results are excluded.
01 Company overview
Identity and registration
- Official name
- NATIONAL ENERGY SYSTEM OPERATOR LIMITED
- Company number
- 11014226
- Company type
- Private Limited Company
- Status
- Active
- Country of origin
- United Kingdom
- Dissolution date
- Not supplied
- Accounts category
- FULL
- Mortgage charges
- 0 total · 0 outstanding · 0 satisfied
- Limited partnership members
- 0 general · 0 limited
A registered office is not necessarily a trading location. The address is reproduced from the Companies House bulk record and should be interpreted in that legal context.
02 Filing dates
Accounts and statements
Last accounts made up to
31 March 2025Next accounts due
31 December 2026Last statement made up to
23 April 2026Next statement due
7 May 2027BritDB does not infer overdue status when the source does not state it.
03 Workforce reporting
Gender pay gap
- Median bonus gap
- 12.0%
- Mean bonus gap
- 1.6%
- Women receiving bonus
- 85.7%
- Men receiving bonus
- 86.3%
- Women in top quartile
- 30.9%
- Women in upper middle quartile
- 39.0%
- Women in lower middle quartile
- 39.2%
- Women in lower quartile
- 45.8%
Positive gaps mean men were paid more; negative gaps mean women were paid more. These figures are employer-reported and describe the workforce distribution, not equal pay for the same job. The company link uses the exact Companies House number supplied by the service.
04 Supplier payments
Payment practices and performance
- Reporting period
- 1 October 2025 – 31 March 2026
- Filed
- 29 April 2026
- Shortest standard term
- 3 days
- Longest standard term
- 42 days
- E-invoicing offered
- Yes
- Supply-chain finance
- Not offered
- Payment codes
- Prompt payment code
- Construction retentions
- No qualifying construction contracts
Complete reported payment fields
- Policy regime
- Regime-3
- Financial period started
- 1 April 2025
- Qualifying contracts
- Yes
- Payments made
- Yes
- Invoice value paid within 30 days
- £3,559,479,968
- Invoice value paid in 31–60 days
- £635,621,423
- Invoice value paid after 60 days
- £42,374,762
- Invoice value paid outside agreed terms
- £338,998,092
- Invoices paid in 31–60 days
- 15.0%
- Invoices unpaid due to dispute
- 1.0%
- Maximum contractual payment period
- 42 days
- Supplier-list charging policy
- No
- Supplier-list charges made
- No
Maximum contractual payment information
n/a
Reported terms and dispute process
- Standard payment terms
30 days
- Other payment-term information
n/a
- Dispute resolution process
All disputes raised will be handled by a combination of the dedicated Purchase to Pay team, the Procurement team and the business unit working with the supplier
Earlier payment reports (11 shown)
- 20.0 average days to pay11.0% outside terms
- 18.0 average days to pay9.0% outside terms
- 16.0 average days to pay9.0% outside terms
- 20.0 average days to pay4.0% outside terms
- 20.0 average days to pay12.0% outside terms
- 21.0 average days to pay25.0% outside terms
- 21.0 average days to pay25.0% outside terms
- 20.0 average days to pay32.0% outside terms
- 16.0 average days to pay31.0% outside terms
- 12.0 average days to pay15.0% outside terms
- 17.0 average days to pay23.0% outside terms
This is a company-submitted statutory disclosure, not a credit rating. BritDB preserves the reporting period and links the report only through the Companies House number supplied by the official service. Percentages describe payments made during that period and may change in later reports.
05 Global legal identity
Legal Entity Identifier
NATIONAL GRID ELECTRICITY SYSTEM OPERATOR LIMITED
LEI 549300Y4N7FKSD848P40 · jurisdiction GB
- Legal form
- H0PO
- Entity category
- GENERAL
- Entity created
- 16 October 2017
- Initial LEI registration
- 7 March 2019
- LEI last updated
- 29 September 2024
- Next renewal
- 29 September 2024
- Managing LOU
- 5493001KJTIIGC8Y1R12
- Legal address
- 1-3 STRAND, LONDON, WC2N 5EH, GB
- Headquarters address
- 1 - 3 STRAND, LONDON, WC2N 5EH, GB
GLEIF Level 2 relationships
IS DIRECTLY CONSOLIDATED BY
From LEI 549300Y4N7FKSD848P40 to LEI 6S9CGO00CJ130HPIHU97
- Related legal entity
- NATIONAL GRID HOLDINGS ONE PLC →
- Initial registration
- 20 October 2023
- Last updated
- 29 September 2024
- Next renewal
- 29 September 2024
- Validation sources
- ENTITY_SUPPLIED_ONLY
- Validation documents
- OTHER_OFFICIAL_DOCUMENTS
- Relationship periods
- Start: 2021-04-01T00:00:00.000Z; End: 2022-03-31T00:00:00.000Z; Type: ACCOUNTING_PERIOD; Start: 2019-03-05T00:00:00.000Z; Type: RELATIONSHIP_PERIOD
- Validation reference
- Not supplied
IS ULTIMATELY CONSOLIDATED BY
From LEI 549300Y4N7FKSD848P40 to LEI 8R95QZMKZLJX5Q2XR704
- Related legal entity
- NATIONAL GRID PLC →
- Initial registration
- 20 October 2023
- Last updated
- 29 September 2024
- Next renewal
- 29 September 2024
- Validation sources
- ENTITY_SUPPLIED_ONLY
- Validation documents
- OTHER_OFFICIAL_DOCUMENTS
- Relationship periods
- Start: 2022-04-01T00:00:00.000Z; End: 2023-03-31T00:00:00.000Z; Type: ACCOUNTING_PERIOD; Start: 2019-03-05T00:00:00.000Z; Type: RELATIONSHIP_PERIOD; Start: 2021-04-01T00:00:00.000Z; End: 2022-03-31T00:00:00.000Z; Type: DOCUMENT_FILING_PERIOD
- Validation reference
- Not supplied
LEI data provides global legal identity and source-reported relationships, not a credit or regulatory approval. BritDB links Level 1 identities only through GLEIF’s Companies House registration-authority identifier and exact company number; Level 2 parent and fund relationships and reporting exceptions are reproduced as supplied by GLEIF.
06 Supply-chain transparency
Modern slavery statement
- Organisation
- NATIONAL ENERGY SYSTEM OPERATOR LIMITED
- Group submission
- Yes
- Parent organisation
- NATIONAL GRID PLC
- Statement period
- 1 April 2024 – 31 March 2025
- Approved
- 10 July 2025
- Sectors
- Utilities: gas, water and electricity
Organisation structure
Covered in the statement
Policies
Covered in the statement
Risk assessment
Covered in the statement
Due diligence
Covered in the statement
Training
Covered in the statement
Goals and KPIs
Covered in the statement
Full statement information supplied to the registry
- Reported turnover band
- Over £500 million
- Years producing statements
- More than 5 years
- ILO indicators included
- Not answered
- Registry record updated
- 15 July 2026
A registry entry records what the organisation declared in its statement. It is not an independent audit. Group statements can cover several companies; BritDB preserves each exact source-supplied company-number link and excludes approver names and email addresses.
07 Ownership and control
People with significant control
The Secretary Of State For Energy Security And Net Zero
- Owns 75% or more of shares
- Controls 75% or more of voting rights
- Can appoint or remove directors
- Legal authority
- England And Wales
- Legal form
- Corporation Sole
- Notified
- 1 October 2024
National Grid Holdings One Plc
- Owns 75% or more of shares
- Controls 75% or more of voting rights
- Can appoint or remove directors
- Country registered
- England
- Legal authority
- United Kingdom (England And Wales)
- Legal form
- Public Limited Company
- Place registered
- Companies House
- Registration number
- 2367004
- Notified
- 16 October 2017
- Ceased
- 1 October 2024
PSC records are company-filed public-register information. When the exact same displayed individual name occurs at multiple companies, BritDB offers a non-indexed cross-reference page. It is a name match only, not proof that the records describe the same person. Service addresses and partial dates of birth are deliberately omitted.
08 Charity register
Charity Commission links
No exact company-number link in this snapshot
The Charity Commission extract did not explicitly associate this Companies House number with a charity. BritDB does not use a name-only match to fill the gap.
This company-level check covers the Charity Commission for England and Wales. Links are accepted only when the official extract supplies this exact company registration number. Scottish charities now have separate OSCR profiles, but OSCR’s bulk fields do not provide a Companies House number, so BritDB does not infer a company link.
09 Northern Ireland charity register
CCNI exact company links
No unambiguous company-number link found
The CCNI source number did not resolve uniquely to this Companies House record. BritDB did not use a name or address match.
CCNI publishes company numbers without a jurisdiction prefix. BritDB links only when the plausible padded UK and NI candidates resolve to exactly one Companies House company.
10 Sanctions screening
UK Sanctions List
No exact business-registration-number link found
The imported UK Sanctions List did not supply this Companies House number as a UK-linked business identifier. BritDB did not attempt a name-only match.
No exact link is not sanctions clearance. UK restrictions can apply through ownership or control even where an entity is not separately named. Always use the current official list and obtain appropriate advice for a legally significant decision.
11 Public procurement
Find a Tender links
CM3107 Lightning Protection Supply and Inspection Services
YORKSHIRE WATER SERVICES LIMITED · updated 18 September 2026
- Tender value
- Not supplied
- Awards
- 672
NESO Interim Capability
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 26 August 2026
- Tender value
- Not supplied
- Awards
- 1
ECP & OPDE Maintenance Support
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 26 August 2026
- Tender value
- Not supplied
- Awards
- 1
Strategic Enterprise Modelling Capability Solution
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 25 August 2026
- Tender value
- Not supplied
- Awards
- 0
DSI Phase 2
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 12 August 2026
- Tender value
- Not supplied
- Awards
- 1
Lead Legal Services Provider for Project Echo
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 31 July 2026
- Tender value
- Not supplied
- Awards
- 1
Technical Consultancy Framework
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 30 July 2026
- Tender value
- £60,500,000
- Awards
- 0
Salesforce Platform Licensing and Support Services
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 26 June 2026
- Tender value
- Not supplied
- Awards
- 2
NESO Surveyor Agency RFP
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 18 June 2026
- Tender value
- Not supplied
- Awards
- 1
Microsoft Enterprise and On-Premise Infrastructure Licensing Agreement
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 8 June 2026
- Tender value
- Not supplied
- Awards
- 1
Procurement Services
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 27 May 2026
- Tender value
- £7,000,000
- Awards
- 1
NESO Facilities Management Services Framework
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
NESO Workplace Fit-Out, Refurbishment and Associated Works (East England)
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
NESO Workplace Fit-Out, Refurbishment and Associated Works (North England)
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
NESO Workplace Fit-Out, Refurbishment and Associated Works (Wales)
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
NESO Workplace Fit-Out, Refurbishment and Associated Works (Midlands)
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
DD&T Value Added Reseller (VAR)
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
Energy Market Modelling Software and Compute Services
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
CRM Platform
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 0
Financial Audit Services
NATIONAL ENERGY SYSTEM OPERATOR LIMITED · updated 22 May 2026
- Tender value
- Not supplied
- Awards
- 1
Showing the first 20 of 45 linked procurement processes.
These links use only the GB-COH identifier supplied in the procurement record. A company may have other public-sector work that is absent, older, below publication thresholds or published without a Companies House identifier.
12 Environmental register
Environment Agency waste registrations
No exact company-number registration linked
The licensed Environment Agency subset did not contain this exact Companies House number. BritDB did not attempt a name-only match.
This is a privacy-reduced, exact-company subset. The full official register also includes sole traders and applicants without a matching Companies House number. Check the current Environment Agency register before relying on registration status.
13 Nature of business
Standard Industrial Classification
14 Connected public record
Checks beyond the company register
Charity Commission
0 exact company-number links.
Northern Ireland charities
0 unambiguous company-number links.
Public contracts
45 procurement processes linked by exact GB-COH identifier.
Waste register
0 exact company-number registrations.
Corporate notices
The Gazette is not yet connected.
UK Sanctions List
No exact business-registration-number link in this report.
A checked source with no exact link is not a clean bill of health. Unchecked sources remain unknown, while sanctions may also apply through ownership or control of a listed person or entity.
15 Record timeline
Dates in the bulk record
- Confirmation statement
Latest confirmation statement made up to this date
- Accounts
Latest accounts made up to this date
- Company name
Previous name: NATIONAL GRID ELECTRICITY SYSTEM OPERATOR LIMITED
- Incorporation
Company incorporated
16 Provenance
Sources for this profile
Identity, address, status, dates, SIC, previous names and mortgage totals.
Annual employer reports linked by the exact source-supplied Companies House number.
Statutory supplier-payment reports linked by the exact source-supplied Companies House number.
Global legal identities linked through Companies House registration authority RA000585.
Annual statement summaries linked by exact source company number.
Current and ceased significant-control records joined by exact company number.
Daily England and Wales extract matched only by the official company registration number.
Daily CCNI export with company links only where the source number resolves unambiguously.
Complete FCDO list checked by exact UK-linked business registration number.
Procurement parties checked only through exact GB-COH identifiers.
Licensed subset linked only by exact Companies House number.
Financial regulation and licences.
Companies House, Charity Commission, OSCR and UK Sanctions List information is public-register data. BritDB reproduces and organises it with source-specific limits; official external links are kept on the dedicated source pages.