Scope 2 Emissions - Aluminum

Track and calculate indirect greenhouse gas emissions from purchased electricity, steam, heating, and cooling for aluminum production

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Energy Categories

  • Purchased Electricity 3.2M tCO₂e
  • Renewable Energy 0.8M tCO₂e
  • Steam & Heating 0.3M tCO₂e
  • Cooling & Refrigeration 0.2M tCO₂e
  • Energy Metrics Analysis

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Total Scope 2

4.5M
tCO₂e
8.2% vs last year
Renewable Mix
22%

Purchased Electricity

Emissions from grid electricity consumption across aluminum smelting and processing facilities

3.2M tCO₂e Total
71% of Scope 2
285 GWh Consumed

Grid Electricity Consumption

Annual electricity purchased from grid utilities
Location-based emission factor for regional grid
Market-based emission factor (if using contractual instruments)

Facility-Level Consumption

Facility Annual Consumption (MWh) Grid Region Peak Demand (MW) Load Factor (%) Actions

Time-of-Use Analysis

Electricity used during peak demand periods
Electricity used during off-peak periods
Total demand charges paid to utilities
Total energy consumption charges

Renewable Energy

Renewable energy procurement, generation, and associated emission reductions for aluminum production

0.8M tCO₂e Avoided
22% Renewable Mix
65 GWh Renewable

Renewable Energy Procurement

Electricity from renewable sources via PPAs or contracts
Renewable Energy Certificates acquired
Power Purchase Agreement contracted volume
Utility green tariff program participation

On-site Renewable Generation

Electricity from on-site solar installations
Installed solar photovoltaic capacity
Electricity from on-site wind turbines
Installed wind turbine capacity
Electricity from micro-hydro systems
Electricity from biomass/waste-to-energy

Renewable Energy Certificates

Steam & Heating

Emissions from purchased steam, heating, and hot water for aluminum production processes

0.3M tCO₂e Total
7% of Scope 2
385 TJ Steam Purchased

Steam Purchases

Annual steam purchased from district heating systems
Emission factor for purchased steam
Average pressure of purchased steam
Average temperature of purchased steam

Heating Applications

Steam/heating for alumina refining and casting operations
Heating for buildings and facilities
Hot water for domestic and process use
Average efficiency of heating systems

District Energy Systems

Heat recovered from smelting processes and utilized
Electricity from combined heat and power systems

Cooling & Refrigeration

Emissions from purchased cooling, refrigeration, and chilled water systems for aluminum production

0.2M tCO₂e Total
4% of Scope 2
125 TJ Cooling Purchased

Cooling Purchases

Annual chilled water from district cooling systems
Emission factor for purchased cooling
Supply temperature of chilled water
Total cooling capacity required

Cooling Applications

Cooling for casting and extrusion processes
Air conditioning for buildings and facilities
Refrigeration for storage and specific processes
Coefficient of Performance for cooling systems

Advanced Cooling Systems

Capacity of waste heat-driven absorption chillers
Hours when ambient cooling can be used
Cooling storage capacity for load shifting

Energy Metrics & Analysis

Comprehensive energy performance indicators and efficiency metrics for aluminum production

14.5 MWh/tonne Al
9.5% Efficiency Gain
₵12.8M Energy Cost

Energy Intensity Metrics

Annual primary aluminum production
Total energy consumed per tonne of aluminum produced
Electricity consumed per tonne of aluminum produced
Water consumed per tonne of aluminum produced

Cost Analysis

Total annual energy expenditure
Average cost of purchased electricity
Additional cost for renewable energy procurement
Effective carbon cost from energy decisions

Efficiency Projects

Potline Optimization

Savings: 3,850 MWh/year
Implementation Status: Completed
Investment: ₵850,000
Payback Period: 3.2 years

Heat Recovery System

Savings: 1,250 MWh/year
Implementation Status: In Progress
Investment: ₵285,000
Payback Period: 2.5 years
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