Running 100 24v 1 amp solenoids with low amperage power supply
As an extension to peters answer, the total power required can be reduced if you get clever with powering your solenoids.

Typically you can get away with using full current to energise your solenoid, but can be reduced to a much lower holding current. (Application dependent)

Depending on how simultaneously you need all your solenoids to come on you could conceivably have a slight delay between turning each solenoid on so peak current draw is kept lower.

Of course this can only be implemented if you are controlling your solenoids through a device that would allow pulse width modulation on the solenoid. Luckily solenoids have a pretty high inductance and can generally be driven at a low frequency.