Whether used to power fans and heaters for a livestock barn, run the lights in the shop, or cut back on a home’s energy usage, adding solar to the farm is a proven way for operations of all sizes to save on their electric bill.

For Jim and Robin Frantum, the benefits of solar were obvious from the moment they turned on their 58.5-kilowatt ground-mounted solar array last year.

Prior to the solar array, the electric bill for their row...