Query: [South Australia] has the most expensive electricity in the world.

Relevant passages:
Adelaide <=SEP=> Adelaide ( -LSB- ˈædəleɪdaudio = En-au-Adelaide . oga -RSB- ) is the capital city of the state of South Australia , and the fifth-most populous city of Australia . In June 2016 , Adelaide had an estimated resident population of 1,326,354 . South Australia , with a total of 1.7 million inhabitants , has the most centralised population of any state in Australia , with more than 75 percent of its people living in greater Adelaide , while the other population centres in the state are relatively small .   Adelaide is north of the Fleurieu Peninsula , on the Adelaide Plains between the Gulf St Vincent and the low-lying Mount Lofty Ranges which surround the city . Adelaide stretches 20 km from the coast to the foothills , and 94 to 104 km from Gawler at its northern extent to Sellicks Beach in the south .   Named in honour of Adelaide of Saxe-Meiningen , queen consort to King William IV , the city was founded in 1836 as the planned capital for a freely-settled British province in Australia . Colonel William Light , one of Adelaide 's founding fathers , designed the city and chose its location close to the River Torrens , in the area originally inhabited by the Kaurna people . Light 's design set out Adelaide in a grid layout , interspaced by wide boulevards and large public squares , and entirely surrounded by parklands . Early Adelaide was shaped by prosperity and wealth -- until the Second World War , it was Australia 's third-largest city and one of the few Australian cities to not have convict history . It has been noted for early examples of religious freedom , a commitment to political progressivism and civil liberties . It has been known as the `` City of Churches '' since the mid-19th century . The demonym `` Adelaidean '' is used in reference to the city and its residents .   As South Australia 's seat of government and commercial centre , Adelaide is the site of many governmental and financial institutions . Most of these are concentrated in the city centre along the cultural boulevard of North Terrace , King William Street and in various districts of the metropolitan area . Today , Adelaide is noted for its many festivals and sporting events , its food and wine , its long beachfronts , and its large defence and manufacturing sectors . It ranks highly in terms of liveability , being listed in the Top 10 of The Economist Intelligence Units World 's Most Liveable Cities index in 2010 , 2011 , 2012 and 2015 . It was also ranked the most liveable city in Australia by the Property Council of Australia in 2011 , 2012 and 2013 .

Energy in South Australia <=SEP=> South Australia is rich in energy resources . It contains significant reserves of fossil fuels such as natural gas , coal , and oil -- although there are incentives to phase these out in favour of clean energy . The state also contains large amounts of uranium , including the world 's single biggest deposit at Olympic Dam , which represents 30 % of the world 's total resource .   More recently , the State has seen a rapid increase in investment in renewable energy , and is now the leading producer of wind power in Australia . South Australia has been noted for the availability of hot rocks suitable for geothermal electricity generation . The South Australian Government has released plans to make South Australia a green energy hub for Australia 's eastern seaboard .

South Australia <=SEP=> South Australia ( abbreviated as SA ) is a state in the southern central part of Australia . It covers some of the most arid parts of the country . With a total land area of 983482 km2 , it is the fourth-largest of Australia 's states and territories . It has a total of 1.7 million people , and its population is the most highly centralised of any state in Australia , with more than 75 percent of South Australians living in the capital , Adelaide , or its environs . Other population centres in the state are relatively small .   South Australia shares borders with all of the other mainland states , and with the Northern Territory ; it is bordered to the west by Western Australia , to the north by the Northern Territory , to the north-east by Queensland , to the east by New South Wales , to the south-east by Victoria , and to the south by the Great Australian Bight . The state comprises less than 8 percent of the Australian population and ranks fifth in population among the six states and two territories . The majority of its people reside in Adelaide . Most of the remainder are settled in fertile areas along the south-eastern coast and River Murray . The state 's colonial origins are unique in Australia as a freely settled , planned British province , rather than as a convict settlement . Official settlement began on 28 December 1836 , when the colony was proclaimed at the Old Gum Tree by Governor John Hindmarsh .   As with the rest of the continent , the region had been long occupied by Aboriginal peoples , who were organised into numerous tribes and languages . The first British settlement to be established was Kingscote , Kangaroo Island , on 26 July 1836 , five months before Adelaide was founded . The guiding principle behind settlement was that of systematic colonisation , a theory espoused by Edward Gibbon Wakefield that was later employed by the New Zealand Company . The goal was to establish the province as a centre of civilisation for free immigrants , promising civil liberties and religious tolerance . Although its history is marked by economic hardship , South Australia has remained politically innovative and culturally vibrant . Today , it is known for its fine wine and numerous cultural festivals . The state 's economy is dominated by the agricultural , manufacturing and mining industries . The state has an increasingly significant finance sector as well .