[kalleboo]

The inertia issue is not some fundamental law of physics, it's just how the DC->AC inverters are commonly programmed, to follow the grid, since that is the easiest way to regulate the grid when non-AC generation is a minority.

The inverters can instead be programmed to form the grid frequency - Australia installed its big battery literally as a much faster way to stabilize grid instability events than spinning up gas peaker plants.

Grids with large amounts of renewables like California are moving toward VPPs (Virtual Power Plants) which are distributed collections of renewables and batteries which are programmed to work in unison to help form the grid, as an easier way to regulate the grid frequency than coordinating each tiny plant separately.

[qmmmur]

Western Australia also has a VPP program that is pretty successful.