You'll now see a think black cloud of smoke being produced by both the Refinery, Power Plant, and Advanced Power Plant. It goes high into the air, and is visible from long distances. This will be added into the 9932 balance patch, which is being finalized now.
Go here to see more details.
On another note, the Radio Commands are being remade. This time they'll be made by one of the actual ingame voices from Red Alert. Read more here.