Co-Power Energy GmbH | Herzog-Heinrich-Straße 18 | 80336 München
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Medium voltage connects high- and low-voltage grids and enables energy supply for industry, large facilities, and Battery Energy Storage Systems (BESS).
Medium voltage refers to a voltage range in the electricity grid between 1 kV and 36 kV (1,000–36,000 volts). It is the network level between high voltage (used for long-distance transmission) and low voltage (used by end consumers). Medium voltage is mainly used for the regional distribution of electrical energy, for example to supply commercial and industrial facilities, large building complexes, or to connect decentralized energy systems.
In the electricity grid, the medium-voltage level acts as the link between high-voltage networks (110 kV and above), which transmit electricity over long distances, and low-voltage networks (up to 1 kV), which supply households, small businesses, and municipal buildings.
Medium-voltage connections are usually implemented via transformer substations and require specialized technical equipment such as switchgear and protection systems.
They must comply with technical connection requirements (TAB) and relevant VDE standards, particularly VDE-AR-N 4110 (Technical Rules for Medium Voltage Connections).
• Grid connection of large photovoltaic, wind, or biogas plants
• Connection of Battery Energy Storage Systems (BESS) in commercial and industrial projects
• Energy supply for large production facilities or logistics centers
• Electricity supply for hospitals, universities, or large data centers
• High-power charging infrastructure (e.g. bus or truck depots)
• Voltage range: 1–36 kV (commonly 10, 20, or 30 kV in practice)
• Connection capacity: medium-voltage connection typically required from approx. 135 kW
• Protection concepts: e.g. earth fault protection systems or distance protection
• Connection guidelines: VDE-AR-N 4110 (TAR Medium Voltage)
• Certification requirements: grid connection certification above defined capacity thresholds
The medium-voltage level is a key infrastructure layer for supplying larger companies and integrating decentralized energy systems into the grid. Projects with medium-voltage connections are subject to strict technical requirements and must be professionally supported during planning, certification, and operation. At the same time, they enable higher connection capacity, improved grid stability, and participation in electricity markets or flexibility services.
