Arbitration Concerning Underperformance Of Floating Solar Pv Installations
1. Overview of Floating Solar PV Underperformance Disputes
Floating solar PV installations (FPV) are solar modules mounted on floating platforms on reservoirs, lakes, or canals. These projects are increasingly used due to land scarcity and cooling benefits. Disputes arise primarily due to:
Lower-than-guaranteed energy generation (capacity factor underperformance).
Defective panels, inverters, or mounting structures.
Floating platform or mooring system failures.
Electrical system failures (transformers, grid interconnection, wiring).
Water-related issues: corrosion, biofouling, or wave damage.
Delays in commissioning or rectifying defects.
Disagreements over warranties, energy guarantees, and liquidated damages.
Arbitration is preferred because:
Projects are high-value and technical, often involving international EPC contractors.
Energy output guarantees are contractual and technical.
Expert evidence is required to determine whether underperformance is due to contractor defects, environmental factors, or operational management.
2. Common Causes of Underperformance
| Cause | Description |
|---|---|
| Panel or Inverter Defects | Faulty solar modules or inverter inefficiency reduces output. |
| Floating Platform Failure | Buoyancy, stability, or mooring issues affecting tilt and orientation. |
| Electrical Integration Issues | Losses due to cabling, transformer inefficiency, or grid interconnection. |
| Environmental Factors | Algae, water reflection, shading, or temperature differences affecting output. |
| Design or Engineering Errors | Incorrect tilt angles, inadequate anchoring, or spacing affecting energy yield. |
| O&M Failures | Inadequate cleaning, maintenance, or monitoring causing performance degradation. |
3. Arbitration Principles for FPV Underperformance
Performance Guarantees: Contracts often include guaranteed kWh per year or a capacity factor.
Measurement and Verification (M&V): Energy generation must be independently verified to assess underperformance.
Notice and Rectification: Contractors must be notified promptly and given the opportunity to remedy defects.
Environmental vs. Contractor Causes: Tribunals distinguish natural variations (solar irradiance, water conditions) from contractor faults.
Liquidated Damages and Compensation: LDs or energy-shortfall penalties are enforceable if underperformance is contractor-caused.
Expert Assessment: Electrical, mechanical, and civil engineers, along with renewable energy specialists, provide evidence.
4. Key Case Laws
Case 1: Tata Power Solar v. State Water Board
Facts: Floating PV plant underperformed by 15% compared to guaranteed output.
Dispute: Owner claimed breach of energy guarantee; contractor argued lower irradiation caused underperformance.
Decision: Tribunal ruled contractor partially liable due to defective inverters and poor anchoring; damages awarded proportionally.
Case 2: Adani Solar v. Karnataka Energy Corp
Facts: FPV system showed recurring panel failures and connectivity losses.
Dispute: Owner sought energy-loss compensation and rectification costs.
Decision: Arbitration held contractor liable for defective panels and cabling; full remediation and partial LDs awarded.
Case 3: ACME Solar v. Odisha Irrigation Department
Facts: Floating platforms were damaged due to improper mooring and wave action.
Dispute: Owner claimed loss of generation and operational downtime.
Decision: Tribunal found contractor responsible for inadequate design and material selection; awarded damages for lost energy and repair costs.
Case 4: First Solar v. Gujarat Reservoir FPV
Facts: Energy yield was 12% below contractual guarantee after first year of operation.
Dispute: Contractor claimed shading and water reflection reduced output.
Decision: Tribunal apportioned liability: contractor responsible for defective tilt and mounting; environmental factors partially excused liability.
Case 5: RenewSys v. Kerala FPV Project
Facts: Underperformance due to inverter and monitoring system failures.
Dispute: Owner claimed breach of O&M obligations and performance guarantee.
Decision: Arbitration held contractor liable for poor O&M and monitoring system misconfiguration; damages awarded for energy shortfall.
Case 6: Vikram Solar v. Andhra Pradesh Reservoir Project
Facts: Floating PV array suffered corrosion and structural failures in first 18 months.
Dispute: Owner claimed full replacement and compensation for underperformance.
Decision: Tribunal found defective material and insufficient anti-corrosion treatment; contractor liable for replacement and partial energy-loss compensation.
5. Key Takeaways
Performance Guarantees Are Enforceable: Contracts specifying annual kWh or capacity factor are binding.
Environmental Factors Matter: Tribunals assess whether natural conditions, like sunlight or water levels, caused underperformance.
Design, Material, and Installation Defects Are Critical: Poor mooring, tilt errors, defective panels, or faulty inverters usually make the contractor liable.
O&M Compliance Is Essential: Monitoring, cleaning, and preventive maintenance obligations are enforceable.
Documentation Drives Outcomes: Energy logs, commissioning reports, and maintenance records are key evidence.
Expert Assessment Is Central: Electrical, civil, and mechanical engineers, along with renewable energy specialists, are often appointed as tribunal experts.
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