For distribution system operators
A contractor that knows the operator's standards
We build, rebuild and underground MV and LV networks to the requirements of distribution system operators — as main contractor, consortium leader or subcontractor.
What operators need
On time, to standard, fully documented
A network operator commissions works to improve supply reliability, connect new customers and generators, or remove clashes with other infrastructure. It expects three things from a contractor: compliance with technical and material standards, a schedule that holds — including planned outages — and documentation that lets the network be taken into service without rework.
We have evidence on each of these. On a contract for ENEA Operator, Zielona Góra Distribution Branch, as consortium leader with TECHNO-BUD sp. z o.o., we built 3 MV/LV transformer substations and an MV cable line 1×150/25 mm² of 3 × 5,715 m, then dismantled 8.266 km of MV overhead line together with 89 pole positions. The works ran from 16.10.2025 to 28.05.2026, through the winter months.
- Materials and technology to the operator's requirements
- Outages planned in advance and kept to the necessary minimum
- As-built documentation and geodetic survey at acceptance
How we work with DSOs
Working together, step by step
- 01
Tender or enquiry
We bid on our own or in a consortium — depending on the size of the contract and the client's requirements.
- 02
Preparation
Works and outage schedule, agreements with landowners and road authorities, materials to standard.
- 03
Construction and connections
Works by our own crews and plant, connections made in outage windows approved by the operator's control staff.
- 04
Dismantling and acceptance
Removal of the old network, testing, as-built documentation, survey and handover for operation.
Services for DSOs
What we build for operators
Overhead line undergrounding
Undergrounding of MV and LV overhead lines: new cable line, HDD crossings, ZKSN junctions, switching and removal of the old line, poles included.
Learn moreMV and LV cable lines
Construction, rebuilding and repair of MV 6–30 kV and LV 0.4 kV cable lines: trenching, drilling, cable laying, joints, terminations, testing and handover.
Learn moreMV/LV substations
Construction of MV/LV transformer substations, ZKSN and LV cable junctions, replacement of pole-mounted units, MV and LV cable connections and testing.
Learn moreMV overhead lines 6–30 kV
MV 6–30 kV and LV overhead lines: pole erection and replacement, line rebuilds, tie-ins to cable lines and removal of lines and pole-mounted substations.
Learn moreUtility conflict relocation
Relocating MV and LV networks that clash with roads, railways and new developments: cable diversions, undergrounding, HDD, DSO outages and acceptance.
Learn moreHorizontal directional drilling
Horizontal directional drilling and pipe jacking under roads, railways and rivers — ducts for MV, LV and fibre cables. Own Tracto-Technik GRUNDODRILL rig.
Learn moreUndergrounding
Why operators underground MV lines — and what it means on site
MV overhead lines running through forests and wooded areas are vulnerable to faults during storms and heavy wet snow. Replacing them with cable is a common way to improve supply reliability. We explain this in more detail in Why operators underground MV lines.
On site, it means working on two fronts: building the new cable line — with drilling under roads and watercourses, cable junctions and joints — and, once supply has been transferred, dismantling the old line, poles and pole-mounted substations. That is how the 15 kV undergrounding in Toruń went, where as a subcontractor to ZILINSKIS we laid 5,725 m of 3× XRUHAKXS 1×150 mm² line and completed around 600 m of drilling and pipe jacking.
Technical experience
What we have already done on MV networks
Several MV cable types
We have laid 3× XRUHAKXS 1×150 and 1×240 mm² and 3× NA2XS(F)2Y 1×150/25 mm² cables — 24.8 km of MV line route in total. Cable comparison in MV cables.
Junctions and substations
We have set ZKSN cable junctions, including a 3-panel unit in Konin, LV cable junctions and new MV/LV transformer substations, while dismantling pole-mounted ones.
Joints and terminations
We have installed 15 kV MV cable joints and indoor, outdoor and connector terminations — 18 sets in Konin alone.
Crossing obstacles
Around 1.5 km of directional drilling and pipe jacking across three contracts — wherever an open trench was not an option.
Overhead lines
MV and LV pole construction and dismantling of 8.266 km of MV overhead line and 89 pole positions for ENEA Operator.
Switching stations
Feeder lines and network rebuilding for the new RS Maliniec 15 kV switching station in Konin.
Projects
Work on operators' networks
The ENEA Operator contract was delivered directly; the others as contractor or subcontractor to firms working for network operators.
ENEA Operator — MV 20 kV network, Niegosławice
Lubuskie Voivodeship
Toruń — MV 15 kV line undergrounding
Kuyavian-Pomeranian Voivodeship
Konin — RS Maliniec 15 kV switching station
Greater Poland Voivodeship
Photos
From our sites
Questions
Questions from network operators
Can you bid in tenders on your own or in a consortium?
Yes. For ENEA Operator we were consortium leader on a contract worth PLN 2,405,200 net. We choose the form of participation to suit the tender requirements.
Do you work with operator-supplied materials?
Yes. We can also purchase and deliver materials to the operator's standard through our equipment supply service.
How do you plan outages?
We draw up the outage schedule during site preparation and agree it with the operator's staff with the required notice. Preparatory work is done without outages, so the connections themselves take as little time as possible.
What documentation do you hand over at acceptance?
As-built documentation, the geodetic as-built survey, test reports, material certificates and the documents required by the operator's acceptance procedure. Details on the How we work page.
Do you dismantle old networks?
Yes — dismantling MV and LV overhead lines, poles and pole-mounted substations is a standard part of our undergrounding contracts.
Planning a tender or investment project?
Send us the documentation — we will prepare a quote with a works and outage schedule.