Underground solar energy systems involve burying solar panels, providing benefits like space efficiency for urban areas, aesthetic preservation, stable temperatures for improved efficiency, wind resistance, enhanced protection from weather, seamless integration with existing structures, and increased security against theft. However, considerations such as soil conditions, construction challenges, and costs are important before installation.

A ballast roof is a method of installing solar energy systems on rooftops that provides several advantages. It maximizes the use of space, increases solar power generation by capturing more sunlight, and adds protection to the building by reducing environmental damage. It also helps lower energy costs by reducing dependence on traditional energy sources and offers environmental benefits by promoting renewable energy and reducing greenhouse gas emissions. Overall, ballast roofs are an efficient, cost-saving, and eco-friendly solution for solar mount.