<
https://reneweconomy.com.au/riddled-with-breakdowns-why-intermittent-coal-power-is-a-major-threat-to-grid-reliability/>
"A new report has highlighted the shocking state of Australia’s ageing coal
generation fleet, reporting that unplanned unit break-downs over summer
occurred on 128 occasions – eight times more than anticipated by the Australian
Energy Market Operator.
The report by Reliability Watch – an initiative of three major environmental
groups – found that, on average, a “staggering” 5.1 gigawatts (GW) of coal
fired power capacity was offline at any one time across NSW, Queensland and
Victoria from October to March .
That is the equivalent of powering 1.2 million homes, and amounts to one
quarter of rated capacity in summer when electricity demand is highest. The
analysis also found a strong correlation between coal breakdowns and high
wholesale prices.
The findings will not be a surprise to anyone. AEMO has previously highlighted
the fact that breakdowns from ageing coal fired generators were the biggest
risk to energy reliability in Australia’s main grid.
It, and most of the major coal fired generator owners, say that Australia must
move beyond the age of “baseload” concepts that dominate the Australian
political debate, and switch to wind, solar, storage and other dispatchable
capacity.
Some in the industry describe it as a switch from “intermittent” coal to
“variable” renewables, a wry twist on the popular accusation that wind and
solar are intermitter.
The reality is, however, that wind and solar output is variable, but
predictable. What the market operator does not like and finds hard to manage is
large generator suddenly going offline without warning, often because of some
technical fault.
The predictability is crucial. Unplanned intermittency from coal units is the
major problem. Battery storage – which has expanded significantly with the
growth of wind and solar – has demonstrated its ability to be a reliable “shock
absorber” for the grid, and load flexibility can provide a similar service."
Cheers,
*** Xanni ***
--
mailto:xanni@xanadu.net Andrew Pam
http://xanadu.com.au/ Chief Scientist, Xanadu
https://glasswings.com.au/ Partner, Glass Wings
https://sericyb.com.au/ Manager, Serious Cybernetics
All comments are Copyright © their respective authors.