A cluster computing device is defined, associated with a plurality of network nodes of the communications network, and it generates a performance model relating configuration parameters of a network node to at least one energy performance parameter of the network node. The cluster computing device transfers the generated performance model to the plurality of network nodes, and then receives information from network nodes, indicating configuration parameters and at least one energy performance parameter of the respective network node. When the cluster computing device identifies a first network node as having a poor performance, it also identifies a second network node as having a good performance, and it causes the first network node to operate with cloned configuration parameters of the second network node.