Natural Resources and Farming Systems: Solar Energy

Insolation Levels: Southern UK solar insolation typically ranges from $900$ to $1200\,kWh/m^2/annum$ . Daily averages vary geographically between $1.5$ and $6.0\,kWh/m^2/day$ .
Seasonality and Inclination: Solar energy collection is highly dependent on the season (e.g., June 21 vs. December 21) and the angle of inclination of the collector.
Orientation: South-facing facades or collectors are optimal for maximum daylight absorption. Efficiency decreases as orientation shifts toward the East or West.

Solar Thermal: Used for water heating, air heating, crop drying, and water desalination.
- Flat Panel collectors are generally less expensive and more impact-resistant ( $1.0\,m^2/person$ ).
- Evacuated Tube collectors are more efficient but higher in cost ( $0.7\,m^2/person$ ).
- Thermal systems can provide up to 50% of annual hot water and reduce $CO_2$ emissions by approximately $400\,kg$ per year.
Photovoltaic (PV): Generates electricity (Domestic, Industrial, Satellites, Water Pumps).
- Panels produce direct current (DC), which is converted to alternating current (AC) by an inverter.
- Output is measured in kilowatt peak ( $kWp$ ) under standard conditions ( $1,000\,W/m^2$ at $25^{\circ}C$ ).

Energy Mix (2024): Bioenergy ( $50\%$ ), Wind & marine ( $25\%$ ), Waste ( $15\%$ ), Heat pumps ( $5\%$ ), Solar PV/thermal ( $4\%$ ), and Hydro ( $2\%$ ).
Agricultural Growth: On-farm renewable production in the UK grew from less than $5\%$ in 2010 to $40\%$ of farms by 2019.
Capacity Tiers: Installed capacity has risen significantly since 2010, categorized by scale (e.g., <50\,kW residential up to >25\,MW large-scale utility).

Definition: Also known as 'solar parks,' these are large-scale, ground-mounted PV applications typically leased for $20$ - $25$ years.
Site Selection (Palmer et al., 2018): Suitable land is identified by excluding National Parks, urban regions, mountainous areas, and Agricultural Land Classification Grades 1 & 2.
Public Perception: General support for solar energy is high in the UK (averaging $82\%$ - $89\%$ ), though local support for specific farms varies (e.g., $47\%$ in Northern Ireland to $57\%$ in Scotland).

Concept: Defined by Macknick et al. as combining agriculture and solar PV on the same land to provide mutual benefits.
Crop Integration: Research on broccoli in South Korea showed that panel shade leads to a deeper green color and better moisture retention compared to open fields.
Soil and Water (Verheijen and Bastos): Agrivoltaic systems can result in a $25\%$ increase in soil infiltration and a $25\%$ reduction in overland flow discharge.
Livestock: Grazing small livestock between panels is possible, while large livestock grazing is considered impracticable.
Biodiversity (Blaydes et al.): Solar parks can enhance pollinator biodiversity by providing foraging and nesting resources and creating microclimatic variation.