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A clear, technical overview of the hidden risks that affect P50, P90 and IRR in modern PV projects — from grid capacity to permitting, land issues and financial realism.
Introduction
Utility-scale solar is growing across Europe, yet many projects fail long before construction.
Not because the technology is weak, but because early-stage risks are underestimated.
This article outlines the key pitfalls that affect P50, P90 and IRR — especially in cross-border contexts.
1. Grid Reality: The Most Underestimated Risk
Most projects collapse at the grid connection stage, not the land stage.
Key issues
- Insufficient local capacity
- New curtailment rules
- Connection delays (12–48+ months)
- Uncertain upgrade costs
Impact
- Lower P50
- Higher P90 uncertainty
- IRR reduction before construction
2. Over-Optimistic Yield Assumptions
Yield modelling mistakes include:
- Unrealistic loss assumptions (temperature, soiling, mismatch)
- Ignoring long-term degradation
- Idealised availability
Conservative modelling is not pessimism — it is risk management.
3. Permitting Bottlenecks
A leading cause of delays across the EU.
- Late environmental findings
- Zoning conflicts
- Parallel processes (municipality, DSO, environmental authority)
- Missing early documentation
4. Land Risk
Not all “available” land is actually usable.
- Hidden land rights
- Micro-topography
- Agricultural restrictions
- Future infrastructure corridors
5. Unrealistic Cost Structures
Using average CAPEX/OPEX instead of site-specific values results in distorted IRR.
Conclusion
P50, P90 and IRR are expressions of uncertainty — not promises.
Projects fail when reality appears too late.
Greenconexa focuses on early-stage screening, documentation and risk mapping for cross-border renewable energy projects.