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What is the value of the voltage before the step-up transformers and right after the generators in the power grid?

I mean the generators connected to the high voltage grid through step-up transformers. What type of power plants are they? I know that voltages change country by country, but I want to know the average value

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    \$\begingroup\$ You won't find an average value. You'll find values for specific ratings of generator : a 50MW one will likely run at lower voltage than a 660MW or 1000 MW one. Pick a few representative generators and start reading about them. \$\endgroup\$
    – user16324
    Commented Dec 7, 2020 at 12:32
  • \$\begingroup\$ @BrianDrummond thank you very much Brian!! \$\endgroup\$
    – Samuele Benito Di Gioia
    Commented Dec 7, 2020 at 16:02

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This will depend not only on country but also by site, as larger power generators tend to have higher voltages. For an example, Siemens provide a catalogue:

Up to 27 kV

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  • \$\begingroup\$ Very thanks! I have seen the catalog and I found only steam generators and combined-cycle generators. So these are the only two types of generators connected to the HV grid? \$\endgroup\$
    – Samuele Benito Di Gioia
    Commented Dec 7, 2020 at 11:49
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    \$\begingroup\$ More likely they are the only ones in that catalogue. Plenty of other types connect to the grid. \$\endgroup\$
    – user16324
    Commented Dec 7, 2020 at 12:38

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