Thank you for the question.
Net zero energy homes would ultimately produce more energy than they use from the grid. They would need to be connected to the grid because of seasonal peaks and demands. In northern latitudes you have less solar. So through different methods, geothermal energy, solar energy, solar-electric, passive solar, and wind energy, we would be able to generate more energy than we would use from the grid and ultimately, potentially, push back into the grid and keep the net usage of that house at or near zero.