EPC contractors in Poland for solar and BESS projects: who builds what (2026)

Separate three roles before you build a target list. They are often mixed up, and they buy, specify and approve different things.

An EPC contractor (engineering, procurement and construction) designs a power plant, buys its equipment and builds it under a single contract. A grid-connection contractor builds the link between the plant and the network: in Poland usually the GPO substation (główny punkt odbioru) and a 110 kV line to the operator’s substation.

Network owners are not contractors. They do not build your plant, but their standards and acceptance procedure decide whether your plant is energised on time. Work on their own networks is procured separately: PSE, for example, contracted SPIE Energy Poland and Elfeko to extend the Gdańsk Błonia 400/110 kV substation for over PLN 402 million (Inwestycje.pl), and Budimex to modernise the Piła Krzewina 110/220/400 kV substation (Gramwzielone). These 400 kV specialists matter for a typical solar or BESS project only when it connects directly to the transmission network.

The buyers sit on the other side: utilities such as PGE and Enea, and independent producers and developers such as R.Power, Greenvolt, Polenergia, EDF and Green Capital. Their projects in 2025 and 2026 are the source of the references below. For the wider market context, see our pages on energy storage and grid infrastructure in Poland.

In a full EPC contract, one company designs, procures and builds the whole plant and carries the risk. In a balance of plant (BoP) contract, the contractor builds civil works, MV infrastructure and often the GPO, while the investor buys modules, inverters or battery containers directly.

For an equipment supplier this decides who the customer is. Under full EPC you sell to the contractor. Under BoP you sell to the investor, and the contractor installs what the investor bought.

Public contracts from 2025 and 2026 show both models, often used by the same company:

Sources: Biznesradar, Gramwzielone, pv Europe, R.Power report 24/2026, R.Power report 22/2025, Polenergia.

Companies that built or are building utility-scale solar or BESS plants in Poland, with references from public contracts.

These are examples, not a complete list. Many more companies build solar and BESS plants in Poland. We chose these to show the range of the market and the contract models in use, based on references we could verify in public sources. Inclusion, absence or order is not a ranking or a recommendation.

• Electrum

  PV · BESS · wind · grid · Polish · electrum.pl

  General contractor in an EPC model for the 80 MW / 320 MWh Lwówek Śląski BESS for Green Capital, including EMS and SCADA and five years of service (Gramwzielone). Also extends the Siersza 220/110 kV substation to prepare the grid for storage connections (Gramwzielone).

• Esix

  BESS · grid · Polish, Wrocław

  Delivers the 250 MW / 1,000 MWh Gdańsk BESS for R.Power (ESS News), and in a consortium with Nomad Electric builds the BoP and GPO for a 150 MW / 300 MWh BESS for the same investor (R.Power report 22/2025).

• Goldbeck Solar Polska

  PV · BESS · subsidiary of German Goldbeck Solar Group · goldbecksolar.com

  Built PV Zwartowo, about 204 MWp, and for Tauron the 90 MWp Postomino plant with a 30/110 kV GPO and an 8 km 110 kV cable route (Gramwzielone). Selected by Virya Energy as EPC for 722 MW of PV in three sites, connected through the STR LKO 400/110 kV substation to the 400 kV transmission network (Gramwzielone).

• LG Energy Solution Wrocław

  BESS turnkey · subsidiary of LG Energy Solution (Korea) · lgensol.com

  Turnkey general contractor for PGE’s Żarnowiec BESS, PLN 1.555 billion gross, with batteries made at its plant near Wrocław; completion planned for Q2 2027 (Biznesradar, Gramwzielone).

• Nomad Electric

  PV · BESS · O&M · Polish, Warsaw · nomadelectric.com

  EPC for the 35 MWp Rajkowy PV farm for Polenergia, excluding modules and inverters; EPC portfolio over 900 MWp and O&M over 1.8 GWp (Polenergia). Lead EPC for a BESS in Jedwabno, including a 110 kV GPO and the high-voltage connection (Nomad Electric).

• Onde

  PV · BESS · wind · part of the Erbud group · onde.pl

  Builds the 300 MW / 1,200 MWh Dzięgielewo BESS for R.Power, including a 400 kV GPO and a high-voltage line, with the battery system excluded from the scope (R.Power report 24/2026). EPC works for two PV farms of 120 MW with connections for future storage (Biznesradar).

• P&Q

  BESS · PV · Polish, Białystok

  General contractor of Greenvolt’s 200 MW / 800 MWh Turośń Kościelna BESS, opened in July 2026, with BYD supplying the batteries (Greenvolt Power), and of the twin Ełk BESS (EBRD).

• Spec Bau Polska and EL Professional

  BESS · Polish consortium

  Design-and-build general contractor of PGE’s Gryfino BESS, up to 400 MW and at least 800 MWh, with start-up planned for the end of 2028 (Gramwzielone).

Contractors with public references for GPO substations and 110 kV connections of solar or storage plants.

Again, examples only. Poland has many more electrical and grid contractors, including regional companies that work mainly with one distribution operator. The five below illustrate the type of company and the references to look for.

• Elektrotim

  GPO · 110 kV · BESS · Polish, Wrocław · elektrotim.pl

  Designs and builds the MV/110 kV GPO and a temporary GPZ bay for the Kłodzko 30 MW PV farm, PLN 21.95 million net, due May 2027 (Parkiet). In October 2026 PGE chose its offer of PLN 312.97 million gross for four BESS sites; the contract was not yet signed (Gramwzielone).

• Elfeko

  GPO · 110 to 400 kV lines · Polish, Gdynia · elfeko.pl

  Designs and builds connections and GPO substations at 110, 220 and 400 kV for wind and solar farms (company profile). Works for PSE with SPIE Energy Poland on Gdańsk Błonia and the Choczewo 400 kV substation (Enerad).

• Elmont Grupa

  GPO · PV · Polish · elmontgrupa.pl

  Built a 100 MWp PV plant with a 30/110 kV GPO substation and the 110/33 kV GPO Banie for wind farms, according to the company (Elmont Grupa).

• Energoaparatura

  GPO · 110 kV · Polish, Katowice · enap.com.pl

  Builds the GPO, a 110 kV cable line and 110 kV switchgear to connect the 95 MW Pajęczno PV farm for Cementownia Warta, PLN 71.25 million net, due November 2026 (Parkiet).

• Enprom

  HV and EHV lines · substations · Polish, Warsaw · enprom.pl

  Builds extra-high-voltage grids and substations and, according to the company, connections for large wind, PV and storage plants (PAP MediaRoom). Its published references are mainly offshore wind and transmission: the onshore 220 kV and 400 kV export cables for Bałtyk 2 and Bałtyk 3 (Gramwzielone) and a 35 km section of PSE’s 400 kV line from Choczewo, signed in May 2026 (PSE).

Several plant builders from List A also deliver the connection themselves: Goldbeck at Postomino, Onde at Dzięgielewo, Nomad Electric and Esix on R.Power’s BESS. Others hand the GPO and the 110 kV line to a subcontractor. The contract scope and the references show which is which.

A capability deck tells you what a contractor wants to do. These six checks tell you what it has done and can deliver on your schedule.

1. 01

   Check the grid scope against references

   Ask for projects where the contractor delivered the connection itself: voltage level, operator, and who signed the acceptance protocol. Then call one or two of those past clients. A short conversation with a previous investor tells you more about delays, change orders and how the contractor dealt with the operator than any presentation.

2. 02

   Experience with your specific operator

   Poland has PSE and five large distribution operators, each with its own technical standards, equipment requirements and acceptance procedure. Engineers who handed over a GPO to Energa-Operator do not automatically know Tauron Dystrybucja’s procedures. Ask which operators the contractor has already completed connections with.

3. 03

   Own engineers or subcontractors

   Ask how many design and electrical engineers are on staff, and whether they hold Polish qualifications for electrical work (SEP) and construction licences (uprawnienia budowlane). Ask which parts of the scope go to subcontractors.

4. 04

   Resources and capacity

   Own equipment, own crews, and how many sites the company runs in parallel. With large BESS projects moving into construction at the same time, the question is whether there is capacity for your schedule.

5. 05

   Bankability

   Financial statements filed in the KRS register, bank or insurance guarantees, and experience with projects financed by banks. Lenders review the EPC as closely as the project.

6. 06

   Polish-language documentation

   The operator and the construction authorities work in Polish. The contractor must produce the full documentation package for connection, permits and acceptance in Polish.

A list is where the work starts. the nech is a Warsaw-based outsourced commercial team for foreign energy companies entering Poland. We build the target list with you, check the contractors’ references, contact the companies in Polish on your behalf and book the meetings.

This is the core of our Poland Entry Sprint: first meetings with EPC contractors, investors and their procurement teams, and a go or no-go decision on the Polish market. If you want to talk it through, book an intro call.