- Fuels : coal, petroleum (oil), Natural Gas, chemicals, Fire wood etc.
- Electrical power
- chemicals for processes.
- Renewables such as solar heat, bio-gas, wind, bio-mass etc.
- Fuels : coal, petroleum (oil), Natural Gas, chemicals, Fire wood etc. - Electrical power - chemicals for processes. - Renewables such as solar heat, bio-gas, wind, bio-mass etc.
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