A hydraulic system, comprising: a hydraulic fluid consuming device; a hydraulic pump unit that provides hydraulic fluid to the hydraulic fluid consuming device; a wattmeter that measures the electric power consumption by the hydraulic pump unit; a controller, an electric motor; and a valve that controls supply of the hydraulic fluid by the pump unit to the hydraulic fluid consuming device; wherein the pump unit is driven by the electric motor; the wattmeter measures the electric power consumption by the electric motor as the pump unit provides the hydraulic fluid to the hydraulic fluid consuming device; characterised in that: the controller uses the electric power measured by the wattmeter to determine power delivered to the hydraulic fluid by the hydraulic pump unit and volumetric flow rate of the hydraulic fluid delivered to the hydraulic fluid consuming device by the hydraulic pump unit; and the controller determines the power delivered to the hydraulic fluid by the hydraulic pump unit by obtaining an instantaneous electric power measurement from the wattmeter and comparing the instantaneous electric power measurement to a predetermined minimum trigger threshold to ascertain a net power delivered to the hydraulic fluid by the hydraulic pump unit; and determines if the pump unit is still running without any demand for hydraulic fluid from the valve. a hydraulic fluid consuming device; a hydraulic pump unit that provides hydraulic fluid to the hydraulic fluid consuming device; a wattmeter that measures the electric power consumption by the hydraulic pump unit; a controller, an electric motor; and a valve that controls supply of the hydraulic fluid by the pump unit to the hydraulic fluid consuming device; wherein the pump unit is driven by the electric motor; the wattmeter measures the electric power consumption by the electric motor as the pump unit provides the hydraulic fluid to the hydraulic fluid consuming device; characterised in that: the controller uses the electric power measured by the wattmeter to determine power delivered to the hydraulic fluid by the hydraulic pump unit and volumetric flow rate of the hydraulic fluid delivered to the hydraulic fluid consuming device by the hydraulic pump unit; and the controller determines the power delivered to the hydraulic fluid by the hydraulic pump unit by obtaining an instantaneous electric power measurement from the wattmeter and comparing the instantaneous electric power measurement to a predetermined minimum trigger threshold to ascertain a net power delivered to the hydraulic fluid by the hydraulic pump unit; and the controller uses the electric power measured by the wattmeter to determine power delivered to the hydraulic fluid by the hydraulic pump unit and volumetric flow rate of the hydraulic fluid delivered to the hydraulic fluid consuming device by the hydraulic pump unit; and the controller determines the power delivered to the hydraulic fluid by the hydraulic pump unit by obtaining an instantaneous electric power measurement from the wattmeter and comparing the instantaneous electric power measurement to a predetermined minimum trigger threshold to ascertain a net power delivered to the hydraulic fluid by the hydraulic pump unit; and determines if the pump unit is still running without any demand for hydraulic fluid from the valve.