 Planning for the construction of Orlando started in 1935, as the electricity demand of Johannesburg was rising faster than what could be met with the existing City Generating Station located in downtown Johannesburg.The location for the station was selected due to its proximity to water supply for coolant and railway lines for the delivery of coal.Construction started in 1939 with Merz & McLellan as consulting engineers, but completion was delayed due to the outbreak of the Second World War.