Doing an energy model of the building is one of the key parts to any of these new construction building measures and figuring out what you need in the building—looking at the amount of energy the different systems will use and the potential systems they might put in and sizing them accordingly. That allows you to know how much energy you need in the way of solar or other renewables.
We are able to model geothermal systems, and we model renewable energy systems like solar as well. We use those models to predict and make sure. Usually these buildings are also connected to the grid, so if things change too much they can always use the grid power as well.