1. Introduction: Nature of the Dispute

Air preheater fouling disputes arise frequently in coal-fired thermal power plants because the air preheater is a critical heat-recovery component. In Indonesian coal plants, especially those using high-moisture or high-ash coal, fouling can significantly reduce boiler efficiency.

An air preheater transfers heat from outgoing flue gas to incoming combustion air. Fouling occurs when deposits accumulate on heat-transfer surfaces due to:

• fly ash deposition;
• ammonium bisulfate formation;
• sulphur compounds;
• unburnt carbon;
• excessive coal ash content;
• inadequate soot-blowing design;
• poor combustion tuning.

Typical arbitration disputes involve claims between:

1. Owner / Independent Power Producer (IPP)
   and
2. EPC Contractor / Boiler Supplier / OEM

regarding:

• failure to achieve guaranteed heat rate;
• excessive auxiliary power consumption;
• forced outages;
• inability to maintain boiler efficiency;
• increased coal consumption;
• cleaning and modification costs;
• liquidated damages.

Indonesian coal supply and power-project disputes often involve complex contractual relationships between coal suppliers, EPC contractors and plant operators. Arbitration clauses are frequently used for resolving such commercial disputes.

2. Typical Arbitration Scenario: Indonesian Coal Plant Air Preheater Fouling

Facts Pattern

A 600 MW Indonesian coal-fired power plant is commissioned under an EPC contract.

The EPC contractor guarantees:

• boiler efficiency: 88%;
• guaranteed heat rate;
• availability: 85–90%;
• continuous operation for a specified period.

After commissioning:

• air preheater differential pressure increases rapidly;
• gas-side pressure loss exceeds design values;
• boiler efficiency decreases;
• fans operate at higher load;
• plant consumes additional coal.

The owner alleges:

"The air preheater design was defective and incapable of handling Indonesian coal characteristics."

The EPC contractor argues:

"The coal supplied by the owner had excessive ash, moisture and sulphur beyond design parameters."

The arbitration tribunal must determine:

1. Was the equipment defectively designed?
2. Was coal quality outside contractual assumptions?
3. Was operation and maintenance inadequate?
4. Are damages recoverable?
5. Who bears performance risk?

3. Main Legal Issues in Arbitration

A. Contractual Performance Guarantees

Most EPC contracts contain:

• guaranteed performance clauses;
• boiler efficiency guarantees;
• heat-rate guarantees;
• emission guarantees;
• reliability guarantees.

The owner argues that air-preheater fouling violates these guarantees.

The contractor usually relies on:

• design coal specifications;
• operating conditions;
• exclusions;
• maintenance obligations.

The tribunal examines whether the guarantee was:

• absolute;
• conditional;
• dependent on fuel quality.

B. Defect vs Operating Condition

The central technical question:

Was fouling caused by:

Contractor Responsibility

Examples:

• incorrect heat-transfer surface design;
• inadequate corrosion allowance;
• wrong material selection;
• insufficient soot blower capacity;
• poor CFD modelling.

OR

Owner Responsibility

Examples:

• excessive ash coal;
• improper combustion;
• poor cleaning;
• operation outside design envelope.

C. Delay and Loss Claims

Owners commonly claim:

Direct damages:

• additional coal cost;
• repair expenses;
• replacement of baskets;
• shutdown losses.

Consequential damages:

• lost electricity sales;
• capacity payments;
• contractual penalties.

Contractors usually rely on:

• limitation clauses;
• exclusion of consequential damages;
• liquidated damages caps.

4. Applicable Indonesian Arbitration Principles

Indonesian arbitration is primarily governed by:

• Law No. 30 of 1999 concerning Arbitration and Alternative Dispute Resolution.

Common arbitration issues include:

• tribunal jurisdiction;
• expert evidence;
• technical causation;
• contractual interpretation;
• enforcement of awards.

For international energy projects, parties may also select:

• ICC Arbitration;
• SIAC Arbitration;
• UNCITRAL Arbitration.

5. Technical Evidence Before the Tribunal

Air-preheater arbitration normally requires:

(A) Engineering Evidence

Experts analyse:

• fouling rate;
• pressure-drop trends;
• flue gas temperature;
• ash chemistry;
• deposit composition.

(B) Coal Analysis

Important parameters:

• ash percentage;
• sulphur content;
• moisture;
• volatile matter;
• calorific value.

(C) Performance Testing

Tribunals consider:

• ASME PTC standards;
• OEM guarantees;
• commissioning tests;
• operational logs.

6. Relevant Case Laws

Case Law 1: Fiona Trust & Holding Corporation v Privalov (2007)

Principle:

Arbitration clauses should be interpreted broadly.

Relevance:

In an Indonesian coal plant dispute, the contractor may argue that the arbitration clause only covers contractual payment disputes.

The owner may argue that:

• design defects;
• performance failure;
• warranty claims

are also covered.

The tribunal applies the Fiona Trust principle that commercial parties generally intend all disputes arising from their relationship to fall within arbitration.

Application:

Air-preheater fouling claims arising from EPC performance obligations would normally fall within arbitration jurisdiction.

Case Law 2: Mitsubishi Motors Corp v Soler Chrysler-Plymouth Inc. (1985)

Principle:

Commercial disputes involving technical and contractual obligations are arbitrable.

Relevance:

A coal plant performance dispute involves:

• engineering guarantees;
• economic losses;
• contractual obligations.

The case supports arbitration of complex industrial disputes.

Application:

Claims regarding boiler efficiency and air-preheater reliability can be resolved through arbitration rather than court litigation.

Case Law 3: Hadley v Baxendale (1854)

Principle:

Damages are recoverable only if they arise naturally from the breach or were within the parties' contemplation.

Relevance:

The owner may claim:

• lost generation revenue;
• additional fuel expenses;
• business interruption.

The contractor may argue these are remote losses.

Tribunal Analysis:

The tribunal asks:

Was loss of generation:

• foreseeable?
• contemplated under the EPC contract?

Application:

Additional coal consumption caused by fouling may be recoverable, but speculative future losses may be rejected.

Case Law 4: MT Højgaard A/S v E.ON Climate & Renewables UK Robin Rigg East Ltd (2017)

Principle:

A contractor may remain liable where it provides a performance obligation even if it complied with industry standards.

Relevance:

This is highly relevant to EPC disputes.

The contractor may argue:

"The air-preheater design complied with accepted engineering practice."

The owner responds:

"The contract required guaranteed performance, not merely reasonable workmanship."

Tribunal Approach:

Where the contract contains absolute performance guarantees, compliance with industry practice may not eliminate liability.

Case Law 5: ICC Case No. 11210 (Construction Arbitration)

Principle:

Technical performance guarantees in construction contracts must be interpreted according to contractual risk allocation.

Relevance:

In power plant arbitration, tribunals frequently examine:

• guaranteed output;
• efficiency requirements;
• testing procedures.

Application:

If the EPC contract allocated coal compatibility risk to the contractor, fouling liability may follow.

If coal quality risk remained with the owner, liability may be reduced.

Case Law 6: Transfield Shipping Inc v Mercator Shipping Inc (The Achilleas) (2008)

Principle:

Contract damages depend upon whether the loss falls within the assumed responsibility of the breaching party.

Relevance:

A coal plant owner may claim:

• electricity-market losses;
• replacement power costs;
• revenue losses.

The contractor may argue these were outside the contractual risk assumed.

Application:

The tribunal separates:

Recoverable:

• repair costs;
• efficiency losses;
• additional fuel consumption.

Possibly excluded:

• speculative market losses.

7. Possible Arbitration Arguments

Owner's Arguments

1. Defective Design

The EPC contractor:

• underestimated Indonesian coal characteristics;
• failed to design adequate cleaning systems;
• selected unsuitable materials.

2. Failure of Guarantee

The contractor promised:

• efficiency;
• reliability;
• availability.

Actual operation failed.

3. Breach of Fitness Obligation

The plant was not suitable for intended operation.

Contractor's Arguments

1. Coal Quality Defence

The contractor argues:

Indonesian coal supplied contained:

• higher ash;
• higher moisture;
• higher sulphur.

Therefore fouling was unavoidable.

2. Operation and Maintenance Failure

Possible causes:

• insufficient soot blowing;
• poor combustion adjustment;
• delayed cleaning.

3. Exclusion Clauses

The EPC contract may exclude:

• fuel-related problems;
• abnormal operation;
• owner-controlled conditions.

8. Tribunal's Likely Determination

A tribunal would normally apply a causation test:

Step 1:

Was the coal within contractual specifications?

If yes → contractor risk increases.

If no → owner risk increases.

Step 2:

Was fouling predictable?

Modern coal plant designers must anticipate:

• ash characteristics;
• sulphur behaviour;
• deposit formation.

Step 3:

Did the contractor provide warnings?

Failure to warn may create liability.

Step 4:

Was mitigation attempted?

Failure by either party to mitigate damages affects compensation.

9. Possible Remedies

The arbitral tribunal may order:

Contractor Liability

• replacement of air-preheater baskets;
• redesign;
• modification costs;
• liquidated damages;
• efficiency compensation.

Shared Liability

Where both parties contributed:

Example:

• contractor underestimated coal variability;
• owner supplied unsuitable coal.

Tribunal may apportion damages.

Owner Liability

Where:

• coal exceeded specifications;
• maintenance was inadequate;
• operation was improper.

10. Conclusion

Indonesian coal plant air-preheater fouling arbitration is fundamentally a technical causation and contractual risk-allocation dispute.

The decisive issues are:

1. contractual coal specifications;
2. EPC performance guarantees;
3. engineering design responsibility;
4. operational practices;
5. foreseeability of damages.

Modern arbitration tribunals generally follow the principles established in cases such as Fiona Trust, Mitsubishi, Hadley v Baxendale, MT Højgaard, ICC construction arbitration jurisprudence, and The Achilleas to determine whether fouling represents:

• defective engineering,
• abnormal operating conditions,
• fuel-quality problems,
• or shared responsibility.