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Apparently first threshold for cutting of hydro storage pumps below 49.85 Hz was undercut very briefly. Immediately afterwards the frequency reaches that threshold again, so I assume those measurements were working as planned.

Below 49Hz larger consumers would be cut off in steps of ~10% of the network load. AFAIK this includes large industrial consumers who are legally required to have the equipment in place to allow for that.

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Industrial consumers will have a contract to be part of first tier load shedding, rather than a legal mandate.

If the grid really needs to shed load, it doesn’t ask, switchgear will just be programmed to physically disconnected consumers at certain grid frequencies. As a consumer you should have equipment that can survive that if it’s important to you, the consumer can then normally get rebates for loss of service later.

Special locations like hospitals are normally the last to be load shed, and the surrounding grid will shed everyone else first, before disconnecting them.

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