What sort of power is made before it goes into the step up HV transformers ?

I know it turns into AC but when is this done ?

Is it dc first then turned into ac?

is it done in a generator /turbine ?What sort of power is made before it goes into the step up HV transformers ?Usually an alternator generates AC power which is stepped to High Voltage with a step up transformerWhat sort of power is made before it goes into the step up HV transformers ?power is usually generated as AC then it is easily transformed to higher or lower voltages