First, have you tried those blue heated water tubs for the goats? They are like muck-bucket sized, and the heating element is sealed within the plastic. I use them for my horses, and if you put them on a piece of styrofoam or something (obviously this would have to be protected from goats) they really use amazingly little current to keep the water thawed. If you built a box around them they'd prolly use even less.
MUCH MUCH better economy than traditional stock tank heaters IME.
For chickens, I fear you really need electricity in SK. (In a milder climate you could just bring fresh buckets of water several times a day, but not where you are

). It won't cost much though unless you are going to have millions of chickens or lots of separate pens. A heated waterer or heated waterer base is usually about 100watts, and won't necessarily be 'on' all the time. Especially if you do a good job designing the coop so that it holds as much heat from various sources as possible.
Good luck, have fun,
Pat