Just before Christmas, the CSIRO presented the government with an analysis in support of their beliefs that wind and solar are the cheapest electricity supply sources. The Australian Energy Market Operator (AEMO) also issued its latest Integrated Systems Plan (ISP), carrying a similar but more nuanced message.
Overlooking evidence that the higher the share of renewables the higher the electricity price, CSIRO’s analysis (GenCost 2023-24) also rejected concerns that the intermittent nature of renewables would translate to impossibly high costs.
Implicitly, the report endorsed the COP28 climate forum’s communique that urges governments to further inch their economies away from coal, gas, and oil. As an added bonus for the government, the CSIRO report lambasted the Coalition’s recent nuclear besottedness, saying this too is vastly more expensive than wind and solar.
Stung by criticism that its earlier cost confections simply assumed the availability of transmission and other support for new, dispersed and irregular wind and solar, CSIRO this time claims to have added in these costs. And voila! Wind and solar are still the cheapest forms of power.
To arrive at that result, CSIRO plays down the cost and need for wind and solar backup. It overstates the cost of coal new plants by:
- understating its operational capability (its consultants, Aurecon, use a 93 per cent ‘capacity factor’ whereas CSIRO uses a maximum of 80 per cent)
- overstating the cost of fuel; and
- assuming a new coal plant would be located on a green field site with no existing infrastructure.


















