Revenue from contracts (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from contracts

Schedule of disaggregation of revenue


		Three Months Ended September 30, 2020
														Consolidated
		Solid Fuel			Natural Gas			Hydroelectric			Corporate			Total
Project revenue:
Energy sales		$	14.3		$	7.5		$	8.5		$	—		$	30.3
Energy capacity revenue			12.2			17.5			—			—			29.7
Steam energy and capacity revenue			—			2.5			—			—			2.5
Waste heat revenue			0.1			—			—			—			0.1
Ancillary and transmission services			—			0.7			0.7			—			1.4
Asset management and operation			—			—			—			0.2			0.2
Miscellaneous revenue			0.1			0.9			—			—			1.0
			26.7			29.1			9.2			0.2			65.2


		Three Months Ended September 30, 2019
															Consolidated
			Solid Fuel			Natural Gas			Hydroelectric			Corporate			Total
Project revenue:
Energy sales		$	12.4		$	7.7		$	9.1		$	—		$	29.2
Energy capacity revenue			13.7			24.3			—			—			38.0
Steam energy and capacity revenue			—			0.2			—			—			0.2
Ancillary and transmission services			—			2.8			0.6			—			3.4
Asset management and operation			—			—			—			0.2			0.2
Miscellaneous revenue			—			0.1			—			—			0.1
			26.1			35.1			9.7			0.2			71.1


		Nine Months Ended September 30, 2020
														Consolidated
		Solid Fuel			Natural Gas			Hydroelectric			Corporate			Total
Project revenue:
Energy sales		$	40.6		$	18.4		$	43.1	$		—		$	102.1
Energy capacity revenue			26.2			58.6			—			—			84.8
Steam energy and capacity revenue			—			6.8			—			—			6.8
Waste heat revenue			0.5			—			—			—			0.5
Ancillary and transmission services			—			2.2			2.4			—			4.6
Asset management and operation			—			—			—			0.7			0.7
Miscellaneous revenue			0.1			0.7			—			—			0.8
			67.4			86.7			45.5			0.7			200.3


		Nine Months Ended September 30, 2019
															Consolidated
			Solid Fuel			Natural Gas			Hydroelectric			Corporate			Total
Project revenue:
Energy sales		$	30.7		$	23.6		$	48.4		$	—		$	102.7
Energy capacity revenue			33.7			66.1			—			—			99.8
Steam energy and capacity revenue			—			0.1			—			—			0.1
Ancillary and transmission services			—			10.3			2.2			—			12.5
Asset management and operation			—			—			—			0.7			0.7
Miscellaneous revenue			0.1			(0.5)			—			—			(0.4)
			64.5			99.6			50.6			0.7			215.4