4. Revenue from contracts

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


	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


	Year Ended December 31, 2018
										Consolidated
		Solid Fuel		Natural Gas		Hydroelectric		Corporate		Total
Project revenue:
Energy sales	$	37.4	$	38.3	$	55.2	$	—	$	130.9
Energy capacity revenue		41.6		56.3		—		—		97.9
Steam energy and capacity revenue		0.1		15.6		—		—		15.7
Waste heat revenue		0.2		—		—		—		0.2
Enhanced dispatch contracts		—		23.9		—		—		23.9
Ancillary and transmission services		4.5		5.4		3.1		—		13.0
Asset management and operation		—		—		—		1.0		1.0
Miscellaneous revenue		—		(0.3)		—		—		(0.3)
		83.8		139.2		58.3		1.0		282.3

Contract balances

The following table provides information about receivables, contract assets and contract liabilities from contracts with customers.


	December 31,		December 31,
	2019		2018
Accounts receivables	$	30.4	$	35.7
Contract liabilities		0.3		0.1

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. Contract liabilities as of December 31, 2018 include a $0.1 million steam sale credit at the San Diego plants.