A chiller plant, comprising: a first chiller circuit including a first chiller and a first process fluid circuit, wherein the first chiller is configured to provide a first process fluid with a first temperature; a second chiller circuit including a second chiller and a second process fluid circuit, wherein the second chiller is configured to provide a second process fluid with a second temperature, the second temperature being different than the first temperature; and a first connecting line including a first flow control device a second connecting line including a second flow control device; wherein the first connecting line is configured to allow fluid communication to be formed between an upstream side of the first chiller in the first process fluid circuit and an upstream side of the second chiller in the second process fluid circuit, and the second connecting line is configured to allow fluid communication to be formed between a downstream side of the first chiller in the first process fluid circuit and a downstream side of the second chiller in the second process fluid circuit; wherein the first connecting line has an open state in which the first flow control device is in an open state, and the second connecting line has an open state in which the second flow control device is in an open state, wherein the first connecting line and the second connecting line being in the open state allows fluid communication between the first process fluid circuit and the second process fluid circuit and wherein the first connecting line has a closed state in which the first flow control device is in a closed state, and the second connecting line has a closed state in which the second flow control device is in a closed state, wherein with the first connecting line and the second connecting line in the closed state the first process fluid circuit and the second process fluid circuit are fluidly separate; whereby in a backup operation mode, in which one of the first chiller and the second chiller is failed and the first connection line and the second connection line are in the open state, process fluid provided by the remaining chiller (110, 120) can be distributed to both the first and second chiller circuits (111, 121). a first chiller circuit including a first chiller and a first process fluid circuit, wherein the first chiller is configured to provide a first process fluid with a first temperature; a second chiller circuit including a second chiller and a second process fluid circuit, wherein the second chiller is configured to provide a second process fluid with a second temperature, the second temperature being different than the first temperature; and a first connecting line including a first flow control device a second connecting line including a second flow control device; wherein the first connecting line is configured to allow fluid communication to be formed between an upstream side of the first chiller in the first process fluid circuit and an upstream side of the second chiller in the second process fluid circuit, and the second connecting line is configured to allow fluid communication to be formed between a downstream side of the first chiller in the first process fluid circuit and a downstream side of the second chiller in the second process fluid circuit; wherein the first connecting line has an open state in which the first flow control device is in an open state, and the second connecting line has an open state in which the second flow control device is in an open state, wherein the first connecting line and the second connecting line being in the open state allows fluid communication between the first process fluid circuit and the second process fluid circuit and wherein the first connecting line has a closed state in which the first flow control device is in a closed state, and the second connecting line has a closed state in which the second flow control device is in a closed state, wherein with the first connecting line and the second connecting line in the closed state the first process fluid circuit and the second process fluid circuit are fluidly separate; whereby in a backup operation mode, in which one of the first chiller and the second chiller is failed and the first connection line and the second connection line are in the open state, process fluid provided by the remaining chiller (110, 120) can be distributed to both the first and second chiller circuits (111, 121).