Off-Grid Mining Camp Diesel Generator Sizing in Northern Canada

Scenario

Project Type: Remote off-grid power system for a gold exploration camp. Location Context: Subarctic region of Nunavut, Canada — extreme cold (−35°C winter), limited transport windows, no grid access. Constraints: Fuel resupply only possible twice per year; strict fuel storage limits (max 25,000 L diesel); generator must support 24/7 critical loads (ventilation, comms, heating) with redundancy. Efficiency and fuel longevity are paramount.

Given Data

• SFOC at Full Load (sfo_full_load): 212 g/kWh (derated due to cold ambient air density and aging engine)
• Power Output (power_output): 4,200 kW (nameplate capacity of primary Caterpillar C32 unit)
• Load Factor (load_factor): 68% (based on measured average demand across 3-month commissioning period)

Calculation

The Fuel Consumption Estimator uses the formula:

fuel_consumption_rate (kg/h) = (sfo_full_load [g/kWh] × power_output [kW] × load_factor [%]) / (100 × 1000)

Substituting values:

• Numerator: 212 g/kWh × 4,200 kW × 68 = 607,712 g/h
• Divide by 100,000 (100 × 1000): 607,712 / 100,000 = 6.08 kg/h

(Note: Diesel density ≈ 0.83 kg/L → ~7.3 L/h; daily consumption ≈ 175 L/day)

Result and Decision

Estimated fuel consumption rate: 6.08 kg/h. Over a 6-month operational season (180 days), projected consumption = 6.08 × 24 × 180 ≈ 26,266 kg (≈31,650 L). This exceeded the 25,000 L storage limit by ~26%. To comply, the team selected a hybrid solution: downgraded to a 3,600 kW unit (same model, derated) and added two 500 kW battery-buffered solar arrays (total 1.2 MW·h storage) to reduce average load factor to 49%. Recalculation yielded 4.51 kg/h — fitting comfortably within fuel constraints.

Lesson

Load factor is not static in remote operations — it must be validated in situ under real ambient conditions; assuming nameplate SFOC without cold-weather derating leads to dangerous underestimation of fuel demand.