We size each pile to your actual soil rather than a generic spec sheet, drawing on 25 years of helical-pile work. One supplier looks after the whole chain, from the first soil test through to the last pile in the ground.
The savings come from running the work in a specific sequence. Five stages handled by the same team, on one signature, from your first email through to handover.
Send us the project size and location, plus any soil data and plans you have. You get back a preliminary budget. Non-binding, but enough to see whether helical piles change your CAPEX picture.
We drive reference piles and run pull-out tests on your actual ground. The only chargeable step before the contract, and it pays itself back through optimised pile design. If the project goes ahead, we rebate 50 % of the test fees.
Measured capacity confirms, then refines, the preliminary design. Pile geometry, length, helix and spacing re-sized to your actual ground. Typical result: pile count down 20–25 %, combined foundation + structure cost down up to 40 %.
Piles and brackets come off our EN 1090 line (European structural-steel certification, Exc2) as our crews drive into the field. Parallel by design: when your ground reveals a pocket that needs a longer sleeve, the factory reacts. GPS-positioned, torque-verified per pile.
You receive the as-built record (every pile coordinate, every torque curve) plus the EN 1090 certificate and a warranty matched to your plant's lifetime. Built to clear bank and investor due diligence.
Foundations are typically 10–15 % of solar CAPEX, and they're usually the line item with the widest variance. Generic estimates can run ±20–40 % off actual cost, but once you replace assumptions with real test data the range tightens to ±5–10 %. On a €10 M scope, that turns €2–4 M of unresolved uncertainty into less than €500 k.
The earlier we see your site, the more we take out.
Two different projects, same method on each. Both started from the racking supplier's standard pile count, and on both we tested the ground and re-sized the piles to what it actually carries. The result was 40,000 fewer piles on one project, and €5.5 M off the foundation budget on the other.
From 170,000 in the racking-supplier's original design to 130,000 in the installed plant. Reached by replacing assumed soil parameters with in-field test-pile data, then re-sizing the pile to what the ground actually carries. 40,000 piles never made, never trucked, never driven.
€13.5 M down to €8 M — same capacity, same site. Each pile sized to test-pile data instead of worst-case assumptions, then optimised further as the install reveals what each row of ground actually demands. Less steel per pile, less install time per pile — and across thousands of piles, those small cuts add up fast.
Two cases, but the method is the same on every site.
See what it would save on yours →
Every pin is a place we've put helical piles: Helicasol's solar projects plus our Paalupiste sister team's foundation jobs. Rovaniemi to Kent, long hauls are routine.
Finland's second-largest solar park. Helicasol delivered the full foundation scope — soil test to handover.
A utility-scale solar site is rarely just panels. Battery containers, inverter platforms and electrical compounds sit on the same site under different loads. We deliver foundations for all of it on one contract, not separate subs.
We deliver helical piles and pile-to-frame brackets for both fixed-tilt and tracker racking systems, and we size each pile to the soil under that row — peat, silt, fill or rock.
Battery containers and inverter platforms load the ground far harder than panel rows do, so we size each pile to the actual container weight rather than stretching a generic spec across the layout.
We handle switchroom buildings, transformer plinths and electrical equipment platforms with no concrete curing time and no wet trades, so the compound stays on the EPC's programme.
We can promise a foundation on peat or fill ground because our fleet was built for it. GPS-guided machines on tracks that float on soft peat. Logistics across ground a wheeled truck would sink in. Two pile technologies, one crew.
Tracked carriers keep ground pressure low on peat. Every pile is GPS-positioned, and torque-verified capacity is recorded in real time as it goes in. We can run up to seven machines in parallel when the programme calls for it.
When a rammed C-profile post is the right answer, we install it ourselves. Same GPS positioning, same crew and same contract as the helical work, so there's no separate ramming sub to manage.
A standard truck cannot reach the install front on saturated peat. Our tracked carriers do — moving pile loads, fuel and crew across ground that would otherwise need a temporary access road.
Piles and brackets come off our own EN 1090 Exc2 line, with heat-number traceability per pile. When the ground reveals a pocket needing a longer sleeve, the next batch is on the line.
Both GPS-guided. Helical piles, rammed C-profile posts, or a mix on the same site — chosen per soil zone, not per sales pitch. Here's how we decide.
Both fleets are GPS-guided, run by our own crews, and delivered under one foundation contract. No second supplier to manage when ground conditions change on site.
Foundations are 10–15 % of solar CAPEX. Without soil tests, that whole budget runs on guesses. Four ways the guesses get expensive.
Designing "to be safe" without site data buys steel you don't need. One project went from 170,000 piles to 130,000 — same ground, same panels.
Six- to seven-figure over-spendThe opposite failure. Re-work reaches every row it touches, and the repair is typically a multiple of the original install.
Re-work > original installThin geotechnical documentation slows bank and investor decisions. Capital sits idle while paperwork is re-issued.
Months lost in due diligenceSurprise soil stops the install. On utility-scale PV, any slippage is revenue lost — and often an EPC penalty.
EPC delay penalty (liquidated damages)We don't quote an off-the-shelf corrosion allowance. The protection spec is decided per site — driven by your plant's design life and the chemistry of the ground itself. Where soils are aggressive, that can mean a heavier coating, a thicker wall, or both.
Quick answers to the questions we hear before the first call. If something here doesn't quite match your project, ask — we'll tell you straight.
Our core scope is utility-scale, typically 1 MWp and up — that's where on-site test piling and per-pile optimisation, the work we're built for, actually shifts the budget enough to justify itself. The numbers usually land above 1 MWp.
Smaller? Ask anyway. We'll tell you straight whether the test-led approach fits your project, or whether a leaner option makes more sense at that size. We also run standalone test-piling work to validate ground for a future scope.
From the first email: a preliminary budget. After contract: test piling, re-engineering, then manufacturing in parallel with install. Full mobilisation can run up to seven machines simultaneously.
Solar foundations typically run 10–15 % of total CAPEX. On a re-engineered scope with our test-pile data, that drops 20–40 % versus the generic racking-supplier spec. Rule of thumb on a typical site: roughly €25k–€60k per MWp, driven by soil, tracker vs fixed-tilt and pile-count density.
Manufacturing and the drill fleet are based in Finland — every rig and tracked carrier ships from there, and the crew operating them travels with the equipment. Our Bolney presence handles local coordination for UK and Ireland projects: site liaison, programme alignment with the EPC, and engaging local labour where the work calls for it. Continental European projects are coordinated from Finland — with experienced installers and Paalupiste's agent network on the ground across the region.
We deliver the foundation: helical piles or rammed C-profile posts, plus pile-to-frame brackets. We don't deliver: the racking or tracker structure itself (that comes from your structural supplier), PV modules, the earthing system, cable trenching, security fence posts, or the electrical grid connection. Where another scope touches ours, we coordinate with the EPC.
We work closely with several of Europe's leading racking and tracker manufacturers. If you don't already have a partner picked, tell us the site and we'll point you to the one we'd choose for it.
Paalupiste Oy is the parent — Europe's most experienced helical-pile manufacturer, founded 2001, serving solar, infrastructure and residential markets. Helicasol Oy is the solar-only subsidiary. Helicasol uses part of Paalupiste's manufacturing capacity, and most of the Helicasol team has worked at Paalupiste at some point — many still do.
Warranty matched to your project's design life — typically 30–50 years for utility-scale solar. Steel grade, coating spec and wall thickness are engineered to outlast that life in your specific ground chemistry. The as-built record and EN 1090 documentation are built to clear bank and investor due diligence.
We recommend, you decide. Soil data drives the recommendation: preliminary first, then test-pile-validated. Because we deliver both technologies under the same contract, with the same crew, we have no commercial reason to push one over the other.
In our experience, helical piles are the clear answer on peat and soft ground. On stiffer ground a rammed C-profile can do the job equally well.
Project size, location, soil data — plus any layout you have. You'll get a preliminary budget and test-piling plan, non-binding and fully confidential. NDA on request.
