Curated links to official technical document sources from European, UK, Irish and German transmission, distribution, standards and regulatory organisations.
Europe-wide, UK, Ireland and Germany sources available now · Denmark and further regions to follow
Browse the document library by region, then by TSO, DNO, DSO, standards body, regulator or utility source.
Pan-European technical document sources from ENTSO-E covering network codes, implementation guidelines and technical specifications for European transmission grid operation and interconnection.
European Network of Transmission System Operators for Electricity. Central publication hub for European network codes, HVDC and AC connection guidelines, research reports and technical specifications underpinning cross-border grid operation.
Technical document sources for UK transmission and distribution networks, covering engineering standards, specifications and compliance documents from TSOs and DNOs.
NGTS specifications and policy documents for the transmission network. Free account required to browse and download publications.
G81 engineering standards library covering EDS, ECS and EAS documents, searchable by category: Design and Planning, Materials, Installation, Testing and Commissioning.
Document library and technical specifications covering connections, substation works, policies and procedures.
G81 engineering document library covering primary, secondary and grid substations, cables, distributed generation, EV/HP/BESS and unmetered. Also includes a general library and open data portal.
SHE Transmission — G81 design and specification documents for the transmission network, plus technical papers and project publications.
Cross-DNO engineering standards catalogue: Engineering Recommendations (G99, G98, P2, P28, G5), Technical Specifications (TS 41-24 earthing), ACE Reports and Engineering Equipment Assessment Lists.
ICP/IDNO information hub including the G81 library of policies, standards and specifications for distribution connections.
Document library covering G81, earthing arrangements and technical specifications.
System Operator for Northern Ireland — grid codes, compliance and technical connection requirements.
Technical document sources for Irish transmission and distribution networks, covering engineering standards, specifications and compliance documents from TSOs and DSOs.
Transmission functional specifications for substations, earthing, lightning and HV assets.
Technical publications covering substation construction, ducting standards and cable installation for distribution connections.
Germany has four transmission system operators and a large number of distribution system operators. Unlike Great Britain, many technical connection requirements are centralised through VDE|FNN application rules, while individual operators reference these requirements in their own connection guidelines.
Transmission operator for North and East Germany. Technical Connection Conditions (TAB/TAR) published in the grid customer area.
Transmission operator for West and Southwest Germany. Netzanschlussregeln folder contains OGCR and TAR-referenced PDFs — the most directly useful document folder of the four TSOs.
Transmission operator for the North–South corridor. Customer connection conditions and EU network-code implementation documents for German grid customers.
Transmission operator for Baden-Württemberg. Grid development and planning documents including connection rules for the south-west Germany region.
Joint portal for all four German TSOs — Network Development Plan (NEP), scenario framework and offshore connection systems.
Publishes the TAR application rules: VDE-AR-N 4100 (LV), 4105 (LV generation), 4110 (MV), 4120 (HV), 4130 (EHV). German equivalent of ENA ERECs. Documents distributed via VDE VERLAG shop.
German energy and water industry association. Publishes complementary technical guidelines and connection guidelines alongside the VDE|FNN TAR rules.
Federal network regulator (BNetzA) — codes, regulations and market rules for the German energy network.
