Table 7.

Sensitivity analysis for natural gas prices.

p g (€/kWh)	0.015	0.020	0.025	0.030	0.035
System composition
Gas engines	3	3	3	2	1
Hot water boilers	3	3	3	4	5
Heat exchangers	4	4	4	2	1
Absorption chillers	2	2	1	1	1
Mechanical chillers	2	2	3	3	3
Cooling towers	4	4	3	3	3
Natural gas (total) MWh/yr	38,028	38,028	37,324	25,977	17,199
Purchased electricity MWh/yr	0	0	29	29	83
Sold electricity MWh/yr	11,712	11,712	11,389	6273	1660
Natural gas (cogeneration) MWh/yr	37,344	37,344	36,638	23,871	12,425
Cogenerated electricity MWh/yr	15,242	15,242	14,954	9743	5072
Cogenerated useful heat MWh/yr	9075	9075	8602	7288	4525
Primary energy savings %	10.74	10.74	10.01	15.93	20.32
Equivalent electrical efficiency %	55.91	55.91	55.22	61.77	68.55
Annual fixed cost €/yr	522,330	522,330	510,830	414,690	320,045
Cost of natural gas €/yr	570,423	760,564	933,092	779,306	599,155
Cost of electricity €/yr	0	0	3207	3207	9424
Profit with the sale of electricity €/yr	−901,838	−901,838	−876,960	−483,019	−127,847
Annual total cost €/yr	190,915	381,056	570,169	714,185	800,776