The photovoltaic panels generate electricity when exposed to sunlight and are connected to the building's power supply via an inverter synchronised to the electricity main's frequency.
BBC: Solar power for City Works centre in Gloucester
There are two main methods of creating a single-frequency network.
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On channel boosters quickly receive the OTA signal from the main tower and retransmit the signal on the same frequency.
Establish high-frequency turn-up-and-go bus and tram services in all main centres, and give buses and trams priority over cars.
BBC: Blair II - The Sequel: What now for transport?
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