Onshore Wells are one of the key enablers to maintain and unlock Oil & Gas production potential. Constructing Water, Oil, and Gas Onshore Wells includes a scope of supplying power to the equipment at the Wellhead area. As the number of new wells is expected to be increased to accommodate the global demand of Oil & Gas, the power consumption is anticipated to increase to accommodate power supply of these new wells. In Saudi Arabia, electrifying Onshore Wells is done currently by constructing Over Head Power Lines (OHPL) from the nearest tap off point to the Wellhead area. OHPL network has congested the area and harms the environment by adding greenhouse emissions. In this paper, powering Onshore Wells by Standalone Solar PV system was techno-economically analyzed. A fixed Standalone Solar PV system of 24, 41, 171 kWp capacities were sized to meet the loads of Water, Oil, and Gas Onshore Wells, respectively. Depending on the distance from the tap off point to Wellhead area, the economic feasibility of adopting Solar PV system can be determined.