Zone"), including four high-frequency CAT bus routes. The Indian Pacific passenger rail service connects Perth with Adelaide and Sydney once per week in each direction. The Prospector passenger rail service connects Perth with Kalgoorlie via several Wheatbelt towns, while the Australind connects to Bunbury, and the AvonLink connects to Northam. Rail freight terminates at the Kewdale Rail Terminal, south-east of the city centre. Perth's main container and passenger port is at Fremantle, south west at the mouth of the Swan River. The Fremantle Outer Harbour at Cockburn Sound is one of Australia's major bulk cargo ports. Utilities Perth's electricity is predominantly generated, supplied, and retailed by three Western Australian Government corporations. Verve Energy operates coal and gas power generation stations, as well as wind farms and other power sources. The physical network is maintained by Western Power, while Synergy, the state's largest energy retailer, sells electricity to residential and business customers. Alinta Energy, which was previously a government owned company, had a monopoly in the domestic gas market since the 1990s. However, in 2013 Kleenheat Gas began operating in the market, allowing consumers to choose their gas retailer. The Water Corporation is the dominant supplier of water, as well as wastewater and drainage services, in Perth and throughout Western Australia. It is also owned by the state government. Perth's water supply has traditionally relied on both groundwater and rain-fed dams. Reduced rainfall in the region over recent decades had greatly lowered inflow to reservoirs and affected groundwater levels. Coupled with the city's relatively high growth rate, this led to concerns that Perth could run out of water in the near future. The Western Australian Government responded by building desalination plants, and introducing mandatory household sprinkler restrictions. The Kwinana Desalination Plant was opened in 2006, and Southern Seawater Desalination Plant at Binningup (on the coast between Mandurah and Bunbury) began operating in 2011. A trial winter (1 June – 31 August) sprinkler ban was introduced in 2009 by the State Government, a move which the Government later announced would be made permanent. See also 1955 Plan for the Metropolitan Region, Perth and Fremantle List of islands of Perth, Western Australia List of Perth suburbs Notes References External links Watch historical footage of Perth and Western Australia from the National Film and Sound Archive of Australia's collection. Historical photos of Perth from the State Library of Western Australia Tourism Australia Page Metropolitan