They can supply about 50% of a homes electricity usage, as most is below
1.1kW. If using below 1.1 kW it turns the meter backwards. Grid-tied.

This brings into question the safety of using such generation devices.

Generators should be isolated from back-feeding onto the supply network,
and afaik no meters are yet available to allow the "export" back onto the
network for a domestic customer.

I spotted an article about an ex-environment minister (?) Donald Dewer I
think ? - who was extolling the virtues of being the first to use a "home
generation windmill" that simply needed to be plugged into a 13A socket,
but no mention was made of a method of isolating that supply from the
network.

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