Electrical standards documents | National Energy System Operator
Summary
NESO's index page listing electrical standards documents for transmission-connected generators across England, Wales, SPT and SHE Transmission areas. The page was refreshed to show an updated EDL Message Interface Specification dated 13 April 2026; all other listed standards are unchanged.
Why it matters
A navigation page, not a rule change. The EDL specification update is a technical communications protocol document affecting how generators log dispatch instructions, not a market or charging change.
Key facts
- •EDL Message Interface Specification updated 13 Apr 2026
- •Covers RES, SPT, SHE Transmission, EDL/EDT and Control Telephony standards
- •Changes to electrical standards go via Grid Code general conditions paragraph 11
Areas affected
Memo
Electrical standards documents | National Energy System Operator Show/Hide Menu Toggle Add to favourites Close tooltip Sign in to add this page to your favourites Sign in or register Show favourites Close Close tooltip Sign in or register to manage your favourites Sign in or register Help You are now signed in Visit My NESO account to view and manage your dataset subscriptions. Maybe later Go to your account Electrical standards documents Here you will find the electrical standards documents including specifications for electronic data communications facilities that apply to transmission-connected generators in England, Wales, and Scotland. Please use the table below to see which standards apply to your connection. RES SPT SHE Transmission EDL/EDT Control Telephony Directly connected in England & Wales ✔ ✔ ✔ Directly connected in SPT’s area ✔ ✔ ✔ Directly connected in SHE Transmission’s area ✔ ✔ ✔ Embedded BM Participant ✔ ✔ RES = Relevant Electrical Standards SPT = Scottish Power Transmission SHE = Scottish Hydro Electric Transmission EDL = Electronic Dispatch Logging EDT = Electronic Data Transfer Raising a change and further help The process for raising changes to the electrical standards is in paragraph 11 of the general conditions of the Grid Code . If you are interested in raising a change to the electrical standards, please contact the Grid Code Review Panel Secretary in the first instance at [email protected] You can find further details in the RES Guidance Document . If you need access to the GB Transmission System National Grid Technical Specifications, please contact the team at [email protected] . England and Wales electrical standards System Defence Plan, System Restoration and Test Plan Specifications for electronic data communications facilities Electrical standards for SPTs transmission system Electrical standards for the SHE transmission system England and Wales electrical standards Rich text Please note that the titles and any references within these standards may use or omit leading zeroes interchangeably for ease of sorting. So for example, TS2.01 and TS2.1 refer to the same document. Name Published Sort ascending BACK-UP PROTECTION GRADING ACROSS NATIONAL GRID / DISTRIBUTION NETWORK OPERATOR INTERFACES AND OTHER THIRD PARTIES - PS(T)010 (RES) 20 Dec 2019 Back Up Protection Grading Across Interfaces 21 Nov 2019 Gas Insulated Switchgear TS_3.02.014_Res_12 24 Dec 2018 Synchronising - TS 3.24.60 RES i2 16 Jul 2018 Operational Date Transmission - TS 3.24.100 RES i1 16 Jul 2018 Substation Interlocking Schemes - TS 3.01.01 RES i1 16 Jul 2018 System Monitoring – Fault Recording - TS 3.24.71 RES i1 16 Jul 2018 Circuit Breakers - TS 3.02.01 RES i2 16 Jul 2018 Ancillary Services Business Monitoring - TS 3.24.95 RES i2 16 Jul 2018 System Monitor – Dynamic System Monitoring (DSM) - TS 3.24.70 RES i2 16 Jul 2018 System Defence Plan, System Restoration and Test Plan Name Published EU NCER System Test Plan 14 Jul 2025 System Defence Plan Issue 6 8 Apr 2025 System Restoration Plan Issue 6 8 Apr 2025 Specifications for electronic data communications facilities Name Published Sort ascending EDL Message Interface Specification 13 Apr 2026 EDL Instruction Interface Valid Reason Codes 5 Nov 2025 Communications Standards for Electronic Data Communication Facilities and Automatic Logging Devices 8 Apr 2025 Control Telephony Electrical Standard 8 Apr 2025 NETA Electronic Data Transfer (EDT) Interface Specification 8 Apr 2025 Distribution Restoration Zone Control System (DRZCS) Standard 4 Jun 2024 MODIS Interface Specification 14 Mar 2016 NETA EDT Submitter Guidance Note 21 Dec 2001 Electrical standards for SPTs transmission system Name Published Sort ascending RES-01-100 Relevant Electrical Standards for Plant, Equipment and Apparatus for connection to the SP Transmission System 4 Oct 2018 Electrical standards for the SHE transmission system Name Published Sort ascending SHE_NGTS 3_11_1 - Capacitors and Capacitor Banks 17 Jul 2014 SHE_NGTS 2_1 - Substations 17 Jul 2014 SHE_NGTS 2_6 - Protection 17 Jul 2014 SHE_NGTS 3_1_1 - Substation Interlocking Schemes 17 Jul 2014 SHE_NGTS 3_2_1 - Circuit Breakers and Switches 17 Jul 2014 SHE_NGTS 3_2_3 - Metal-Oxide surge arresters 17 Jul 2014 SHE_NGTS 3_2_4 - Current Transformers for protection 17 Jul 2014 SHE_NGTS 3_2_5 - Voltage Transformers 17 Jul 2014 SHE_NGTS 3_2_6 - Current and Voltage Measurement 17 Jul 2014 SHE_NGTS 3_2_7 - Bushings for the NG System 17 Jul 2014 logo--facebook