01“Tenevo Solar” PV — MV/400 kV substation and 400 kV switching station
Solarpro Technology AD · 400 kV
Promenergomontazh AD · since 1964
We build Bulgaria’s energy infrastructure.
Substations up to 400 kV, power lines and battery energy storage — from design to commissioning.
The power grid of Bulgaria
Lighting up — place by place.
34 completed projects · 950 MW · 3.7 GWh — in Bulgaria and Romania. Tap “Brusartsi”, “Smolyan”, “Burgas” or “Tenevo” on the map for photos from the sites.
Company
Over 60 years in Bulgaria’s energy sector.
Promenergomontazh AD delivers the full investment cycle — design, permitting, supply, construction and commissioning.
We work as turnkey main contractor for ESO EAD, leading independent power producers and international partners in Bulgaria and Romania. In-house design, our own production of steel structures and foundations, our own machinery.
34Completed reference projects
950MWInstalled capacity*
3,7GWhStorage capacity*
1964Founded in Plovdiv
* Completed and ongoing projects as of 2026.
The path of energy — this is what we build
Services
Full engineering for the energy sector.
20 – 400 kV
Substations
Step-up and interconnection substations, switchyard reconstruction and extension, control buildings and 20–33 kV switchgear.
OHL · UGC · OPGW
Power lines
Overhead and underground lines up to 400 kV, including interconnectors, with OPGW fibre-optic links.
MW · MWh
Battery parks
BESS in single, double and quad configurations, integration with PV, wind and hydro plants, O&M.
F1 · F2 · OPS
Own foundations
Pyramidal F1/F2 foundations, slabs and oil-containment basins for batteries, PCS and transformers — from 3D model to installation.
BG · RO
Design and permitting
From concept design to building permit, including under foreign legislation.
Substations · BESS · PV
Maintenance and service
Service maintenance of substations, battery parks and PV plants — 24/7 response.
Also: industrial and high-rise construction, water and sewer networks, district heating networks, in-house steel structures (gantries, cable trays, lightning masts) and construction-waste recycling with permits in 14 regions.
Projects
Selected references.
01
02Grid connection of “Gabare” PV — 400 MWp with a 1000 MWh battery
External connection only: 33/400 kV substation, 23.6 km 400 kV line and a 400 kV bay at “Mizia” substation · 400 kV
03Burgas Energy Complex
BESS, 110/20 kV substation, 110 kV cable · 150 MW / 601.7 MWh
04“Vetrokom” battery storage
At an operating wind farm · 65.55 MW / 154.77 MWh
05Smolyan Energy Complex
“Rozhen” 20/110 kV substation, 110 kV line · 320 MWh
Where we work
Sites across Bulgaria — and in Romania.
Our own machinery, production and crews on site — from Kavarna to Smolyan, from Kostinbrod to Burgas.
- 17 sites in Bulgaria
- Isalnita · RO
Under construction
Over 650 MW of new capacity — right now.
Three large projects in Bulgaria and Romania — design, foundations, substations, lines and grid connection.
Gabare · Bulgaria
Grid connection of a PV plant with a battery park
400MWp · 1000MWhWe build the external connection only: a 33/400 kV step-up substation, a 23.6 km 400 kV line and a new 400 kV bay at ESO’s “Mizia” substation.
Isalnita · Romania
Our largest battery park
158.6MW · 634.4MWhA 33/110 kV step-up substation and battery park.
Krivodol · Bulgaria
Battery park with a 33/110 kV substation
34.5MW · 104.5MWhA 110 kV cable line and a new bay at an ESO substation.
Certificates and registrations
- ISO 9001:2015
- ISO 14001:2015
- ISO 45001:2018
- ISO 50001:2018
- ISO 3834-2
- ISO/IEC 27001
- Chamber of Builders · I – V
- DAMTN
- TÜV NORD · TÜV Rheinland
Clients and partnersESO EADSolarpro TechnologyEVN BulgariaERM ZapadElektrorazpredelenie YugLiebherrMETLENBTLGalabovo Solar
Contact
Let’s build your next energy project.
Tell us about the project — we will propose a technical solution, schedule and offer.
Send an enquiry- E-mailoffice@pem.bg
- Phone+359 32 397 210 · +359 878 567 677
- Address40 Kuklensko Shose St., 4004 Plovdiv, Bulgaria
- UIC115079353