The detail of revenues for the years ended December 31, 2017, 2016 and 2015, is as follows:

	For the years ended December 31,
	2017		2016		2015
Revenues	ThCh$		ThCh$		ThCh$
Energy sales		2,268,459,154		2,312,643,619		2,247,363,757
Generation		1,082,749,256		1,141,725,803		1,134,450,921
Regulated customers		726,166,640		805,079,958		726,264,558
Non-regulated customers		285,623,737		234,641,908		264,113,111
Spot market sales		70,958,879		102,003,937		140,339,722
Other customers		—		—		3,733,530
Distribution		1,185,709,898		1,170,917,816		1,112,912,836
Residential		442,137,827		431,610,828		407,435,626
Business		386,608,105		379,037,776		350,157,120
Industrial		225,736,231		229,878,875		230,416,697
Other consumers (1)		131,227,735		130,390,337		124,903,393
Other sales		107,362,797		73,607,457		32,057,524
Natural gas sales		91,652,707		64,443,715		12,582,771
Sales of products and services		15,710,090		9,163,742		19,474,753
Revenue from other services		114,648,227		129,592,804		104,871,908
Tolls and transmission		39,812,005		51,014,073		37,958,975
Metering equipment leases		4,945,609		4,555,779		4,415,191
Public lighting		13,449,852		12,660,894		10,859,012
Engineering and consulting services		3,414,472		14,304,336		1,817,284
Other services (2)		53,026,289		47,057,722		49,821,446
Total Revenues		2,490,470,178		2,515,843,880		2,384,293,189

Other Operating Income	ThCh$		ThCh$		ThCh$
Mutual support		—		—		14,563
Commodity derivatives		20,328,649		10,794,682		1,820,371
Other income (3)		18,548,051		14,928,257		12,901,017
Total other income		38,876,700		25,722,939		14,735,951

(1)

For the year ended December 31, 2017, it includes revenues from energy sales to municipalities of ThCh$36,165,698; government entities of ThCh$20,080,121 and agricultural sector entities of ThCh$5,811,319, and other of ThCh$ 69,170,597. For the year ended December 31, 2016, it includes revenues from energy sales to municipalities of ThCh$37,338,741; government entities of ThCh$18,333,375; agricultural sector entities of ThCh$5,377,993; and other of ThCh$69,340,228. For the year ended December 31, 2015, it includes revenues from energy sales to municipalities of ThCh$39,405,365; government entities of ThCh$18,631,045; agricultural sector entities of ThCh$5,356,396; and other of ThCh$61,510,586.

(2)

For the year ended December 31, 2017, it includes services for construction of junctions of ThCh$15,514,433; works in specific facilities and networks of ThCh$15,125,128; and other services of ThCh$22,386,728. For the year ended December 31, 2016, it includes services for construction of junctions of ThCh$14,359,194; works in specific facilities and networks of ThCh$21,397,176; and other services of ThCh$11,301,352. For the year ended December 31, 2015, it includes services for construction of junctions of ThCh$16,289,581; works in specific facilities and networks of ThCh$16,736,234; and other services of ThCh$11,741,987.

(3)

For the year ended December 31, 2017, it includes revenues from energy losses recoveries of ThCh$1,968,203; revenues from outdated collection of invoices of ThCh$1,299,470; and revenues from other services of ThCh$15,280,378. For the year ended December 31, 2016, it includes revenues from energy losses recoveries of ThCh$1,344,529; revenues from outdated collection of invoices of ThCh$1,540,348; and revenues from other services of ThCh$12,043,380. For the year ended December 31, 2015, it mainly related to revenues from water sales of ThCh$823,821; and revenues from other services for ThCh$4,877,987.