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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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Why do power stations use synchronous generators and not induction generators?
This is not entirely true. In small power stations not connected to grids and wind turbines they usually use induction generators instead of synchronous for their capability of producing energy at varying rotor speeds and their price which is lower the synchronous generators. Before I tell you why they use synchronous in big power stations connected to the grid you must know that usually you have more than one power plant connected to the grid. And if you want the power of each power plant to be added to the grid you need the all the alternating currents to be in phase so the frequency must be the same. And as you probably know they are called SYNCHRONOUS generators because the speed of the rotor (the frequency) is the same as the AC supply current. So obviously it will be much easier to control the frequency of a synchronous generator and therefore easier to synchronize with the grid.
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