Spark Infrastructure Group is engaged in investment in regulated electricity distribution and transmission businesses in Australia. The Company operates through four segments: Victoria Power Networks, SA Power Networks, TransGrid and Other. Victoria Power Networks holds interest in two electricity distribution businesses in Victoria, which include CitiPower and Powercor. SA Power Networks is the operator of South Australia's electricity distribution network, supplying approximately 856,000 residential and commercial customers. TransGrid connects generators, distributors and end users in New South Wales (NSW). It holds interest in the electricity transmission business, which include NSW Electricity Networks Assets Holdings Trust (NSW Electricity Networks Assets) and NSW Electricity Networks Operations Holdings Trust (NSW Electricity Networks Operations). Other represents the economic interest in DUET Group. The Company also invests in regulated water and sewerage assets.