Scope 1 Emissions

Track and calculate direct greenhouse gas emissions from aluminum production processes and owned sources

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Emission Categories

  • Smelting Operations 6.8M tCO₂e
  • Energy Generation 2.1M tCO₂e
  • Anode Production 1.4M tCO₂e
  • Mobile Equipment 0.9M tCO₂e
  • Other Direct Emissions 0.3M tCO₂e

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Total Scope 1

11.5M
tCO₂e
5.8% vs last year

Smelting Operations

Direct emissions from aluminum electrolysis and reduction processes

6.8M tCO₂e Total
59% of Scope 1
8 Potlines

Primary Aluminum Production

Total annual primary aluminum production
Electrolytic cell current efficiency
Average anode effect duration and frequency
Perfluorocarbon emissions from anode effects

Reduction Process

Operating voltage of reduction cells
Average electrolyte bath temperature
Annual alumina consumption for smelting
Annual cryolite and bath material consumption

Process Optimization

Energy consumption per tonne of aluminum
Average age of potlines in operation

Energy Generation

Emissions from captive power plants and on-site energy generation

2.1M tCO₂e Total
18% of Scope 1
4 Power Plants

Captive Power Generation

Electricity from captive coal power plants
Electricity from natural gas turbines
Emergency and backup power generation
Overall efficiency of captive power plants

Fuel Consumption

Annual coal consumption for power generation
Annual natural gas consumption
Diesel for generators and backup power
Heavy fuel oil consumption

Cogeneration

Annual waste heat recovery utilization
Steam production for process requirements
Overall efficiency of cogeneration systems

Anode Production

Emissions from carbon anode manufacturing and baking processes

1.4M tCO₂e Total
12% of Scope 1
3 Anode Plants

Anode Manufacturing

Total baked anode production
Annual petroleum coke consumption
Annual coal tar pitch binder consumption
Net carbon consumption per tonne aluminum

Anode Baking

Fuel for anode baking furnaces
Thermal efficiency of baking furnaces
Typical anode baking cycle duration

Pitch Volatiles

Volatile organic compounds from pitch baking
Efficiency of emission control systems
Recycled anode butts in production

Mobile Equipment

Emissions from material handling, transport, and mobile combustion sources

0.9M tCO₂e Total
8% of Scope 1
245 Vehicles

Material Handling

Diesel for alumina transport and handling
Diesel for anode transport and changing
Diesel for molten and solid metal handling
Fuel for material handling equipment

Plant Transport

Light vehicles, service trucks, personnel transport
Fire trucks, ambulances, security vehicles
Total mobile equipment units

Equipment Utilization

Average equipment operating hours
Average fuel consumption rate
Average annual operating hours per equipment

Other Direct Emissions

Additional direct emission sources specific to aluminum production

0.3M tCO₂e Total
3% of Scope 1
15 Sources

Refrigeration Systems

Refrigerant losses from casting and cooling systems
Emissions from building climate control systems

Emergency Systems

Diesel consumption for emergency generators
Annual hours of emergency generator operation
Diesel for emergency fire water pumps

Other Sources

Fuel for quality control laboratory equipment
Welding consumables for maintenance operations
Fuel for hazardous waste incineration
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