Concrete Substations HEKA

Concrete Substations HEKA compact substations (CSS) are delivered as fully integrated turnkey systems, making it easier to implement reliable medium-voltage grid connections with predictable quality and faster project execution. Designed for modern power distribution needs, they provide a robust foundation for utilities and other operators upgrading networks, expanding capacity or building new connections to the MV grid. While utility companies remain a primary customer group, Metal Substations HEKA CSS is also well suited for industrial and infrastructure projects that require new or expanded medium-voltage connections to the power grid. The result is practical, standards-focused compact substation delivery that supports safe operation, smooth commissioning and long-term performance.

Feel free to ask from our specialist:

Heigo Pikkor

Sales Manager | Compact substations and medium-voltage switchgear (Estonia)

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Rait Kangro

Head of Sales and Marketing

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HEKA C CSS units are manufactured from reinforced concrete up to 160 mm thick, ensuring exceptional durability and resistance to demanding environmental conditions. Designed to transform voltages from 6–36 kV down to 0.4–1 kV, they provide versatile solutions for a wide range of electrical distribution applications.

Delivered as fully integrated turnkey systems, HEKA C CSS is engineered to meet the evolving needs of diverse end users. While utility companies remain the primary customers, these substations are also widely adopted by organizations requiring new or expanded medium-voltage grid connections.

Typical applications include:

Industrial facilities such as manufacturing plants and logistics centers
Renewable energy projects, including solar parks and battery energy storage systems (BESS)
EPC firms managing large-scale infrastructure projects
Real estate developers building residential or commercial zones requiring grid access
Electrical wholesalers seeking standardized, reliable solutions

Configurations available:

Outdoor substations: Delivered as a single unit, operated externally
Indoor substations: Operated from within the enclosure, consisting of two elements—the enclosure and a cable cellar installed beneath it

Most HEKA C CSS products are type-tested in accordance with IEC 62271-202, ensuring compliance with international standards and dependable performance in diverse operating environments. Additional benefits include customizable design, short lead times, strong production capacity, and proven references from major utilities in Scandinavia and Estonia.

Exceptional Durability & Safety

HEKA Compact Substations (HEKA C CSS) are built from reinforced concrete up to 160 mm thick, offering strong protection in harsh environment and higher fire resistance as option. This robust structure supports long service life, safe operation. Solutions are type-tested to IEC 62271-202, making them a solid choice for critical power distribution infrastructure.

Versatile Voltage Transformation

Designed for medium voltage to low voltage transformation, HEKA C CSS converts 6–36 kV to 0.4–1 kV. This flexibility supports a wide range of electrical distribution needs across industrial facilities and logistics centres, renewable energy projects and real estate developments that require dependable grid connections.

Turnkey Solutions with Customization

Delivered as fully integrated turnkey compact substation solutions, HEKA C CSS helps simplify installation and reduce lead times. Both indoor and outdoor configurations are available, with options for customised technical design and appearance. Combined with strong production capacity and proven use by major utilities, HEKA Compact Substations upports evolving grid requirements with reliable, tailored solutions.