With the current drought in the western U.S., solar farms are becoming a preferred way of utilizing land and water resources versus crops and farmland. However, replacing large-scale agriculture with solar technologies can change the local climate by changing land-cover characteristics. The goal of this research project is to test the climate impact of large-scale solar farms using a high-performance computing cluster for climate modeling. This work will build on the initial computer simulations that were run as part of the TomKat seed grant project. As a next step, we have begun to run a long (multi-year and multi-decade) experiment testing the influence of large-scale solar on the climate of the western U.S. This long-range experiment is necessary to distinguish the influence of large-scale solar from the background noise of climate variability.