Zimbabwe Electricity Supply Authority, (ZESA) officially called ZESA Holdings (Pvt) LTD., is a state-owned company whose task is to generate, transmit, and distribute electricity in Zimbabwe. It has organized this task by delegation to its subsidiaries, the energy generating company Zimbabwe Power Company (ZPC) and the Zimbabwe Electricity Transmission and Distribution Company (ZETDC). Other subsidiaries are investment branch ZESA Enterprises (ZENT) and internet provider PowerTel Communications (Pvt) ltd. ZESA is the only electricity generator and supplier for the public grid. For many years the company has failed to produce enough energy to meet demands. ZESA produced an estimated 8.89 bill kWh in 2007, while demand was estimated to 10.89 kWh.