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Have you considered placing a greenhouse/cold frame over the pond? Greenhouse plus a pump might be all you need to keep the water from freezing. But I'm not used to northern winters so maybe someone else has some better ideas for you. I don't know what kind of pond you have now but in ground is...

You can try placing a pump in the water to disturb the surface and minimize freezing. Think aquarium/koi pond equipment or adjusting the pond design. Some pumps are solar powered, doesn't help much in the winter but if you're worried about power cables/electrocution/fire risk etc this might be...