Detra Solar | Excellence in Project Design

Elektrum Lietuva Solar Parks, started operating in October 2025

Located in Kiškėnai (91 MW), Dovilai (78 MW), and Smeltė (7.15 MW), the parks cover a combined area of around 360 hectares – the equivalent of approximately 514 football fields. Their addition triples Elektrum Lietuva’s solar generation portfolio, marking a significant milestone in Lithuania’s transition toward greater energy independence.

• Kiškėnai: 130928x Trina TSM-NEG21DC.20 695 Wp bifacial modules. DC Capacity: 90994.96 kWp, AC Capacity: 74560 kVA (@ Pnom);
• KUS (Klaipėda unlimited sun): 112728x TSM-690NEG21C.20 690 Wp bifacial modules. DC Capacity: 77782.32 kWp, AC Capacity: 60160 kVA (@ Pnom);
• Smeltė: 10276x Trina TSM-NEG21DC.20 695 Wp bifacial modules. DC Capacity: 7141.82 kWp, AC Capacity: 5760 kVA (@ Pnom).
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Deliverables:

1. General Plan: Overall layout optimizations of the 2-portrait fixed-tilt PV system within the provided boundary.
2. Fence & Road Layout: Design and placement of fencing and maintenance roads around the site.
3. Various Elevation Drawings: Detailed side views of the fence, road, PV mounting system, inverter mounting and cable connection, string wiring, and other elements.
4. Stringing Layout: PV String design and labeling system on a string level.
5. String Cable Duct Layout: Distribution of string cable ducts on site.
6. DC/AC Cabling Layouts: LV cables distribution on site (string/inverter level).
7. Trench Design: Design of trenches for cabling on site.
8. Single Line Diagram: Full electrical schematic of the project on a LV level.
9. PVSyst Yield Analysis: Simulation and analysis of the PV system’s energy yield while accurately evaluating various shading and losses on site.
10. Bill of Materials: Comprehensive list of equipment and quantities required for construction.
11. Ampacity calculations: Main LV power cables selection for the project.
12. Piling information: Preparation of module structure coordinates and pile length lists with leading PV software – PVcase.
13. Earthing Layout: Grounding plan, how the module structures and inverters are grounded.

Main challenges:

• Terrain and Structure Adaptability: We conducted a terrain analysis to adjust the module structure sizes in challenging terrain areas. Through multiple design iterations, we successfully adapted the entire site using Polish-manufactured mounting structures without the need for cut-and-fill, significantly reducing construction costs for the client. Additionally, we collaborated with the structure manufacturers to find a solution for utilizing peat-covered areas by incorporating concrete piles, which allowed us to maintain the required DC capacity without removing any module tables in difficult terrain.

• Trenches Adaptability: To achieve required capacity due to limited space between the road and modules, we needed to place trenches between piles at some places (between first and second, second and third or even third and fourth). In result, we didn‘t lose DC Capacity and total yield. Also, it saved the length of trenches for the client.

Additionally, our thorough terrain analysis, in collaboration with Polish manufacturers, enabled the implementation of non-standard mounting structures, eliminating the need for cut-and-fill and further reducing construction expenses. These design optimizations ensured a smooth transition into the construction phase.