An electrosurgical generator includes an RF output stage, a DC blocking capacitor, a measuring circuit, and a sensor circuit. The RF output stage generates electrosurgical energy for application to an active electrode. The DC blocking capacitor is electrically coupled between the RF output stage and the active electrode. The measuring circuit is coupled to the DC blocking capacitor and measures the voltage across the DC blocking capacitor. The sensor circuit determines the current of the electrosurgical energy as a function of the voltage across the DC blocking capacitor.