Design of HV Substations
for renewables (RES), Industry, and Power Sector

Scope of Services
Selected Projects

We design 110/220/400 kV substations
ready for grid connection, with full integration of generation units and energy storage systems.

Effective grid integration starts with a well-designed connetion to the gird. We deliver comprehensive high-voltage substations enabling safe, grid-compliant, and optimized connection to the gird, power plants or industrial facilities. Our expertise covers voltage levels of 110 kV, 220 kV, and 400 kV.

Who do we design high-voltage substations for?

Battery Energy Storage Systems (BESS)
Wind and photovoltaic farms
Waste-to-Energy Installations
Power Plants and CHP Plants
Utility and distribution power sectors

Why Enetecs?
We design high-voltage substations with deep understanding of technology, grid requirements, and investment realities.

  • We understand industry requirements - we design HV substations for renewables projects, distribution system operators (DSOs), industrial clients, and conventional utilities.
  • We take a system-wide approach - we design complete electrical power systems: from the grid connection point, through HV substations, to generation units or energy storage.
  • We provide regulatory support - we assist in dealings with Transmission System Operators, Distribution System Operators, or independently manage permitting and prepare grid compliance studies.
  • We deliver complex projects - from PV and CCGT plants to nuclear units, within the 110–400 kV range.
  • 3D modeling and BIM technology - we design using BRCM, E3D, Revit, and Navisworks, ensuring precise multi-discipline coordination.
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What We Offer

Our high-voltage substation design services include:

Power Connection to the gird:

  • HV substations – connection to Distribution System Operator/Transmission System Operator
  • 110 kV / 220 kV / 400 kV switchgear design
  • Primary and secondary circuits, MV and LV systems
  • Integration with generation units and energy storage systems

Simulations and Studies:

  • Short-circuit analyses
  • Reactive power analyses
  • Load flow studies
  • Protection coordination and settings
  • Grid code compliance simulations (NC RfG)
  • Grid connection feasibility studies

Project Phases:

  • Conceptual, basic, construction, detailed and as-built design
  • 3D modeling
  • Support with grid connection conditions and coordination with Distribution System Operator/Transmission System Operator
Comprehensive high-voltage substation design
  • We deliver full-scope or partial-scope HV substation projects, and can act as General Designer when needed – always relying on our in-house team and trusted partners.
  • We design HV substations with full integration of generation and energy storage – from concept and grid impact analysis to detailed design.
  • We support investors in procurement and implementation – providing design supervision and installation coordination.
How Does Our Process Work?

Submission of a Request for Quotation (RFQ)

Analysis of the Request and Input Data

Tailored offer preparation

Meeting to define scope and delivery timeline

Order placement per GTCS or negotiated agreement

Input data/documentation freeze

Design execution and delivery

Implementation of changes due to updated input data, if needed

Technologies We Use
Dig-silent-logo
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DIALux_Logo
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Trimble-logo
WSCAD-Logo
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autodesk-navisworks-LOGO
autodesk-revit-LOGO
Soldis-Projektant-LOGO
zikos-LOGO
HEXAGON-logo
BIM-360-Logo
AVEVA-logo
Our Experience in Numbers

320 MWh Energy Storage System,
2025 – Multidisciplinary Project

0 MW

Installed PV capacity

HV substation designed with connection to the gird
0 MWh

Energy storage capacity

BESS integrated with substation infrastructure

0 MVA

Power transformer

sized for combined storage and MV grid operation

CCGT Plant,
2024–2025 – 220 kV & 110 kV Substations

0 MWe

CCGT unit capacity

dual voltage level of connection to the gird (220 kV & 110 kV)

0 kV

Main switchgear

single-busbar LT configuration, AIS technology

0 kV

Auxiliary power switchgear

single-busbar LT configuration, AIS technology

0 MVA

Unit Transformer 220/18. kV

connected to Transmission System Operator grid via overhead line
0 MVA

Auxiliary Transformer 110/10.5 kV

supplies internal block systems

CCGT Plant,
2023–2025 – 400 kV & 110 kV Substations

0 MWe

CCGT unit capacity

evacuation system designed at 400 kV and 110 kV

0 kV

Main switchgear

single-busbar LT configuration, AIS technology; transmission grid connection

0 kV

Auxiliary switchgear

single-busbar AIS integrated with block systems

0 MVA

Unit Transformer 400/18.5 kV

connected to 400 kV switchgear

0 MVA

Auxiliary transformer 110/10.5 kV

supplies plant infrastructure

Nuclear Power Plant in Central Europe,
2024–2025 – Conceptual Design of 400 kV Power Evacuation System

0 MWe

Net capacity of a single nuclear unit

conceptual evacuation design for three generating units

0 kV

Main Power Distribution Switchgear

4-bay with auxiliary busbar, designed in AIS technology

0 MVA

Single generator transformer capacity

single-phase units integrated into evacuation system

0

400 kV overhead lines

full concept for outgoing line configuration and transmission grid interface

Want to join the group of clients
for whom we’ve delivered hundreds of successful designs?

Let us know!

Learn more about our
high-voltage substation projects

The European energy sector is undergoing its most significant transformation in decades. The growing share of renewable energy sources, the increasing need for energy storage, and the progressive electrification of industry and transport pose new challenges for power grid infrastructure. In this context, modern high-voltage (HV) substations are becoming strategic nodes of the power system, ensuring reliable interconnection between energy producers and consumers.

Technological Innovations in HV Substation Design

Modern HV substation design goes far beyond traditional solutions. Innovative technologies are reshaping this field: Compact GIS (Gas-Insulated Switchgear) solutions reduce substation footprint by up to 70–80% compared to traditional AIS (Air-Insulated Switchgear), which is particularly important where land availability is limited. Digital substations based on the IEC 61850 standard replace traditional copper wiring with fiber optics, increasing reliability, reducing cabling costs, and enabling advanced diagnostics. Advanced monitoring and diagnostic systems allow predictive maintenance and early detection of potential failures. Hybrid solutions combining GIS and AIS technologies offer an optimal balance between cost, reliability, and space requirements.

HV Substations in the Context of Renewable Energy Integration

The rapid development of renewable energy sources poses specific challenges for HV substations: Managing highly variable power flows. Ensuring voltage stability under fluctuating generation. Integration with energy storage systems. Compliance with grid codes (NC RfG, NC HVDC). Modern automation and protection solutions, such as adaptive protection systems and advanced power flow control algorithms, are crucial for effective integration of renewable energy sources into the grid.

Environmental and Social Aspects in HV Substation Design

Contemporary HV substation design takes into account not only technical aspects but also environmental and social considerations: Solutions minimizing landscape impact (lower structural heights, vegetation-based visual shielding). Noise reduction from transformers and other equipment. Elimination or minimization of SF6 (a gas with high global warming potential) in favor of alternative insulating media. Land-use optimization and minimization of impact on local biodiversity.

Digitalization of the HV Substation Design Process

The implementation of advanced digital tools is revolutionizing HV substation design: Building Information Modeling (BIM) enables comprehensive interdisciplinary coordination and minimizes clashes. Electromagnetic simulations allow optimization of busbar layouts and equipment arrangement. Short-circuit and load flow analyses based on advanced algorithms ensure optimal equipment selection. Virtual walkthroughs before physical construction help identify potential operational issues.

The Future of HV Substations in the Context of Smart Grids

Future HV substations will act as intelligent nodes within the Smart Grid, equipped with: Advanced energy quality measurement and monitoring systems. Artificial intelligence algorithms optimizing grid operation. Adaptive reconfiguration capabilities in response to changing conditions. Integration with demand-side management systems and energy storage. Such solutions will not only enhance grid reliability and economic efficiency but also enable full integration of distributed energy resources and active consumers.

The Importance of a Comprehensive Approach to HV Substation Design

The success of modern HV substation projects depends on a holistic approach that considers all aspects—from electrical engineering and structural design to environmental protection, safety, and operational ergonomics. Only such an integrated perspective, supported by advanced design tools and extensive expertise, makes it possible to develop solutions that will operate efficiently for decades in a dynamically evolving power system. Investing in professional HV substation design is not only a guarantee of reliable energy infrastructure today but also a foundation for a flexible and sustainable energy system of the future.
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