Which factor most directly affects solar energy viability in a region?

• A. Ocean depth
• B. Soil density
• C. Magnetic field strength
• D. Solar insolation

Answer: (D)

Solar energy viability hinges on how much sunlight reaches a region, which is captured by solar insolation. Solar insolation is the amount of solar radiation received per unit area over a given time and is shaped by latitude, time of year, cloud cover, and the atmosphere. Regions with higher insolation receive more photons that can be converted into electrical energy, so they generate more power from solar panels. The other factors listed don’t directly determine how much solar energy is available: ocean depth doesn’t change the sunlight reaching land-based systems; soil density doesn’t affect the amount of sunlight a panel can receive; magnetic field strength has little to no impact on photovoltaic energy production.