Solar Mounting Steel: the €/MWp Buyer’s Guide (Fixed, Tracker, Agri-PV)
Steel tonnage per MWp for fixed-tilt, tracker and agrivoltaic systems, delivered €/kg logic and coating decisions by corrosion class.
Editorial author: Steel-Hub.eu
Published:
TL;DR
- ▸Steel demand per megawatt is the number that matters: indicatively ~30–50 t/MWp for fixed-tilt ground mounts, ~35–55 t/MWp for single-axis trackers, and ~60–110 t/MWp for elevated agrivoltaic systems.
- ▸Budget fabricated mounting steel (profiles, punched, coated) at roughly €1.8–3.2/kg delivered in the EU — coating system and section complexity decide the position in the band.
- ▸Corrosion is the silent spec: C4/C5 environments and 25–30 year design lives push projects from plain HDG toward Magnelis® ZM310-class coatings.
- ▸For 2026 delivery windows, the constraint is rarely panels — it is punched-steel fabrication slots and foundations coordination.
Why €/MWp beats €/piece for mounting steel
Solar procurement teams compare module and inverter prices to three decimals, then buy the substructure — often 8–15% of total plant CAPEX — on a per-piece quote that hides tonnage. The honest metric is steel tonnage per MWp × delivered €/kg, adjusted for foundations.
This guide gives indicative 2026 tonnage and price bands for the three dominant system families, and the specification decisions that move them.
Indicative steel demand per MWp (2026)
| System family | Steel demand | What drives it |
|---|---|---|
| Fixed-tilt ground mount | ~30–50 t/MWp | Wind/snow zone, pile spacing, module size |
| Single-axis tracker | ~35–55 t/MWp | Torque tube sizing, drive spacing, terrain |
| Elevated agrivoltaic | ~60–110 t/MWp | Clearance height (4–6 m), machinery spans, dual-use loads |
| Carport / dual-use roof | ~45–80 t/MWp | Span, drainage, vehicle impact requirements |
Indicative Central-EU ranges for structural steel including posts, rails and bracing, excluding module clamps and foundations concrete. Site statics always govern.
From tonnage to budget: the €/kg logic
- 01Coating system: hot-dip galvanizing (EN ISO 1461) is the baseline; Magnelis® ZM310-class coatings for C4/C5 sites and cut-edge protection sit higher per kg but extend service life
- 02Section complexity: roll-formed C/Sigma profiles with punching are cheaper per kg than welded assemblies; tracker torque tubes price differently than rails
- 03Batch size and repeatability: MW-scale orders of identical parts drop unit cost measurably — design for repetition
- 04Logistics: mounting steel containerizes and flat-packs; delivered cost within the EU is a small fraction of the total, unlike oversized structures
The agrivoltaic premium — and why buyers accept it
Elevated agri-PV roughly doubles steel demand versus ground mount. What buyers get for it: dual land use (cultivation continues underneath), access for machinery between 4–6 m clearance posts, and eligibility for agri-PV support schemes in markets like Italy, France and Germany. The structure becomes the product — which is why substructure quality and corrosion class dominate the risk register.
Solar mounting procurement FAQ
How much steel does a 10 MWp solar park need?
Indicatively 300–500 tonnes for fixed-tilt ground mount, more with trackers, and 600–1,100 tonnes if elevated agrivoltaic. Ask suppliers to quote tonnage explicitly — it makes offers comparable.
HDG or Magnelis-class coating — how do we decide?
By corrosion category and design life: C3 sites with 25-year life are routinely fine with hot-dip galvanizing; C4/C5 (coastal, agricultural ammonia, industrial) and 30+ year expectations favour ZM310-class continuous coatings with cut-edge self-healing. Specify the category, then let the coating follow.
What lead time should we plan for mounting steel?
From frozen design: typically 4–8 weeks fabrication for MW-scale batches plus EU road delivery in days. The schedule risk is usually design freeze and foundations sequencing, not fabrication.
Who carries the structural responsibility?
The substructure supplier should deliver statics to Eurocode (wind/snow per site), stamped where the jurisdiction requires it, plus material traceability. For elevated agri-PV in DACH, expect building-permit-grade documentation — closer to a hall than to a ground mount.