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For an alternating current (AC) grid, *every* alternator must be exactly in phase with every other. If not, one will attempt to feed power to the other, rather than adding to the power in the system.

Synchronous alternators are easily controlled for speed, and therefore, for phase.

As well, synchronous alternators can be made with no electrical contacts, so they are very long-lived and reliable.

Be aware that *all* power plants connected to a grid use synchronous machines.

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