JOHANNESBURG, Oct 21 (Reuters) - South Africa is seeking cheap finance for more than 400 billion rand ($27.6 billion) of electricity infrastructure as part of its plans to move away from heavily polluting coal, a senior presidency official said on Thursday. Through a funding facility backed by rich nations and development finance institutions, South Africa hopes to build more than 180 billion rand of cleaner power generation, 120 billion rand of transmission equipment, as well as substations, transformers and distribution technology. More than 80% of the country"s electricity is currently generated by burning coal, making it the world"s 12th biggest carbon emitter. But last month the government adopted a more ambitious emissions reduction target ahead of the United Nations COP26 climate summit in November. read more "South Africa"s message: We are prepared to make a substantial carbon reduction, but this must be financed by developed countries on concessional terms," presidency official Rudi Dicks said in a presentation. State power company Eskom has said it is seeking up to $12 billion (around 180 billion rand) from global lenders for the transition away from coal. read more But Dicks" presentation made clear that amount only accounted for the cost of building more than 7,000 megawatts (MW) of new generation from sources like solar, wind and natural gas to replace coal units that will be decommissioned. It said the country was also seeking grants and low-cost loans to pay for a transmission grid expansion of at least 8,000 kilometres (4,970 miles), strengthen distribution corridors and set up a fund to accelerate economic diversification in a province with many coal plants. Britain, the United States, Germany, France, as well as French and German development banks and the World Bank, could contribute funds, one slide showed. Eskom plans to decommission between 8,000 and 12,000 MW of coal over the next decade, it said in August.