What is the voltage that comes out of power stations?

Let's look at this from a from a simplistic point of view.

When working with electricity, power is a combination of amperage, and voltage. Amperage drops significantly with distance, voltage does not. Because of this, a power plant generates its power as a combination of a huge voltage with very little amperage. Therefore, the power loss over long distances is minimized. Power station voltages are in the hundreds of thousands of volts.

However, these voltages are too dangerous for everyday use. Thus, they are transformed down to lower voltages such as 120 for household use, 480 for industrial, and other voltages.

During power transformation, power is not lost. Thus, if you decrease the voltage, then your amperage goes up to provide the same power.