The "permanent" networks have a surprising degree of compatibility. Globally, 50/60Hz equipment is procured in a relative handful of mostly standardised voltages. Often, higher-rated components can and are used in lower rated roles too e.g. 550kV rated equipment is actually quite common in the UK even though we only go to 400kV (AC).
Handing Ukraine odds-and-sods of spares is not a major headache; and nor is shipping out diesel generators. However when it starts coming to shipping replacement switchgear or transformers that's another matter entirely. Besides being incredibly difficult to move (500 tonnes+ not unusual - even the AN225 could not ship them by Air); the supply chain for them has lead times in excess of 1 year - and that chain is growing while simultaneously large amounts of demand for new stuff (e.g. to connect up new nukes, windmills).
A very large proportion of global output of such hardware is expected to have to go for the rebuilding of Ukraine (noting that whatever the outcome of the war, that rebuild needs to happen regardless; eventually).
Demand being what it is, I'm actually surprised there hasn't been a move to expand production capacity because it's practically guaranteed work for the next 30 years.
Biting the hand that feeds IT
