"German battery storage developer Younicos has no such doubts. “We have heard of the ‘real inertia’ discussion and it sounds a little strange to us,” says Philip Hiersemenzel from the Berlin-based Younicos.
“There is, of course, absolutely no need for ‘real inertia’ rather a ‘synthetic inertia’ to keep the grid stable,” Hiersemenzel says.
“In fact, if you’re starting from the premise that more and more power should and will be provided by cheap, clean, but intermittent renewables such as wind and solar, then ‘synthetic’ inertia has a number of manifest advantages.
These included the ability to manage faster ramp rates. “This phenomenon is most easily evident on island systems – simply because they are smaller and it’s easier to implement a higher share of renewables there. But what holds on islands also holds for larger grids.” ”
(...) One observer, who asked not to be named, says much of the debate going on about what “real” inertia is, and the technical merits of various technologies to provide inertia, has been self-serving and framed by interests of the gas lobby and gas turbine machine suppliers (...)
Dylan McConnell, from the Climate and Energy College in Melbourne, says the current design would actually explicitly prevent flywheels and synchronous condensers – which could actually provide inertia at all time. “That seems strange … and the seeming exclusion of batteries also makes little sense – particularly considering the fact that gas generation can only provide inertia when it is actually on! (Unlike batteries, which can sit there and respond very incredibly quickly. Gas generators also have to run at minimum load (which can be significant) to do this, rather than a battery, flywheels and/or synchronous condensers. Most offline gas generation has T1 (time to synchronisation) greater than 5 minutes, and T2 times (time to minimum load) of more than 10 minutes – which is hardly useful from a system security standpoint (and compared with less than 100 milliseconds for batteries).” (...)
Andrew Stock – who worked for 40 years in energy industry, including thermal and renewable generation – said the legislation as currently framed favours outdated technologies, ageing plant and fossil fuels, and further entrenches market power of gas generators (...)"
"(...) Tony Concannon, the former head of GDF Suez Australia (now Engie), says solar and battery storage already beat baseload gas on price, and its costs will continue to fall rapidly.
It is also a blow to those who insist that gas generation is the only alternative as a transition fuel to a high renewables grid – a position given huge amplification by the Murdoch media and prominent ABC journalists such as Andrew Probyn and Chris Uhlmann (...)"
a system with a large proportion of gas turbines is possibly more vulnerable to short-term instability than a modern renewable based system with storage
Probably the most expensive, least reliable way to supply grid stability is by adding gas turbines, if the primary purpose is to add inertia.