Revenue from contracts

12 Months Ended

Dec. 31, 2020

Revenue from contracts

Revenue from contracts

4. Revenue from contracts

Revenue, receivables and contract liabilities by segment consists of following:

	Year Ended December 31, 2020
										Consolidated
	Solid Fuel		Natural Gas		Hydroelectric			Corporate		Total
Project revenue:
Energy sales	$	58.8	$	24.2	$	54.9	$		—	$	137.9
Energy capacity revenue		34.6		79.2		—			—		113.8
Steam energy and capacity revenue		—		10.5		—			—		10.5
Waste heat revenue		1.0		—		—			—		1.0
Ancillary and transmission services		—		3.1		3.4			—		6.5
Asset management and operation		—		—		—			1.0		1.0
Miscellaneous revenue		0.1		1.2		—			—		1.3
		94.5		118.2		58.3			1.0		272.0

	Year Ended December 31, 2019
										Consolidated
		Solid Fuel		Natural Gas		Hydroelectric		Corporate		Total
Project revenue:
Energy sales	$	41.1	$	31.0	$	65.9	$	—	$	138.0
Energy capacity revenue		38.7		86.7		—		—		125.4
Steam energy and capacity revenue		—		11.7		—		—		11.7
Waste heat revenue		0.2		—		—		—		0.2
Ancillary and transmission services		—		4.7		2.9		—		7.6
Asset management and operation		—		—		—		1.0		1.0
Miscellaneous revenue		—		(2.3)		—		—		(2.3)
		80.0		131.8		68.8		1.0		281.6

Contract balances

Contract liabilities as of December 31, 2020 include a $0.2 million fuel reserve fund at Dorchester and a $0.1 million steam sale credit at the San Diego plants. Contract liabilities as of December 31, 2019 include a $0.2 million fuel reserve fund at Dorchester and a $0.1 million steam sale credit at the San Diego plants. We had no contract assets at December 31, 2020.