Money will probably be used the same way that it was used in EUII, to build units, improvements etc. Energy is to represent the fact that just because a city has factories does not mean that it has the elctric power to run it, Transports, I assume, represent the fact that just because a country has resources does not mean that has that they are made in location A and magically appear at location B, but that they must be transported there.
I think that the electricity and Transports icons and stats will mainly deal with how effiecent IC and resource production is, money will most likely be used to trade on the World Market as well as making units and expanding parts of cities/provinces.