This study examines the relationships between electricity consumption, solar energy generation, and energy savings in buildings. It investigates the impact of banked solar energy rates on kilowatt-hour costs in non-retrofit buildings. The study aims to evaluate whether on-site solar production can reduce kWh costs in properties that have not undergone retrofitting. Data on electricity usage, solar energy output, and banked rates were collected from a religious institution in Connecticut, USA, over two years (2018–2019). The findings reveal that kWh costs peak during colder months when solar generation and banked rates are lower compared to warmer months. Notably, solar energy consumption is higher during the cold months but dips in the warm months. In 2018 and 2019, the average solar energy generated was 43,193 kWh and 40,286 kWh, respectively, while the average solar consumption was 44,233 kWh and 41,006 kWh. The study consistently found a negative average in kWh saved during colder months. An increase of 3,227 kWh in energy usage was recorded in 2019 compared to 2018, alongside a rise in solar energy production by 2,907 kWh within the same period. The cost per kilowatt-hour ranged from 0.173 to 0.175 in 2018 and 0.195–0.197 in 2019, with power costs per kWh also increasing during this period. The results suggest that lower energy banked rates are linked to higher kWh energy costs in buildings. These findings could provide valuable insights for potential incentives that might interest building owners in on-site solar energy projects. This study may help forecast appropriate costs and payback periods for building owners seeking long-term investments in energy efficiency and building performance.