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Expenses by Nature (Tables)

12 Months Ended

Dec. 31, 2020

Analysis of income and expense [abstract]

Expenses classified by nature

Expenses classified by nature are as follows:


Year ended Dec. 31			2020						2019						2018
			Fuel, carbon compliance and purchased power			Operations, maintenance and administration			Fuel, carbon compliance and purchased power			Operations, maintenance and administration			Fuel, carbon compliance and purchased power			Operations, maintenance and administration
Fuel and carbon compliance			574			—			669			—			656			—
Coal inventory writedown (Note 17)			37			—			—			—			—			—
Purchased power			163			—			246			—			210			—
Mine depreciation			144			—			119			—			136			—
Salaries and benefits			50			235			52			228			98			245
Other operating expenses			—			237			—			247			—			270
Total			968			472			1,086			475			1,100			515