Photovoltaic cells can still generate electricity in cloudy or low-light conditions, albeit at reduced efficiency. They are designed to capture and convert diffuse sunlight, which penetrates through clouds or is reflected off surrounding surfaces. Advances in cell materials and designs have improved the performance of photovoltaic cells under such conditions. For instance, thin-film and multi-junction cells are known to perform relatively well in diffuse light. Additionally, technologies like microinverters and power optimisers can enhance the performance of solar panels in variable lighting conditions, ensuring optimal energy production.

To mitigate the environmental impact of land use, solar thermal plants often incorporate strategies like dual-use farming or agrivoltaics, where agricultural activities are combined with energy production. This practice maximises land use efficiency and can reduce the impact on local ecosystems. Additionally, site selection prioritises degraded or contaminated lands unsuitable for agriculture or construction. Environmental impact assessments are conducted before construction to identify and mitigate potential ecological impacts. Furthermore, efforts are made to restore and rehabilitate the land post-decommissioning, ensuring the preservation and restoration of natural habitats and ecosystems.

Advancements in materials and manufacturing processes have significantly reduced the energy payback time of photovoltaic cells. The use of thinner silicon wafers and improved cell designs has enhanced efficiency, reducing the amount of material and energy required for production. Automation and technological innovations in manufacturing have streamlined production, reducing energy consumption. Additionally, the development of alternative materials like perovskite and organic photovoltaic cells promises higher efficiencies and lower production costs, further reducing energy payback times. These advancements collectively contribute to making solar energy a more sustainable and economically viable option.

Solar thermal plants often use thermal energy storage systems to store excess heat generated during sunny periods for use during cloudy days or nighttime. One common method involves heating a fluid, often molten salt, which retains heat effectively and can store it for extended periods. The stored thermal energy can be extracted from the molten salt and used to produce steam, driving a turbine to generate electricity when needed. This capability to store energy enhances the reliability and flexibility of solar thermal plants, allowing them to provide a consistent power supply even during periods without sunlight.

Thin-film photovoltaic cells are generally less efficient than crystalline silicon cells but have advantages in flexibility, weight, and aesthetics. They can be applied to curved surfaces and are ideal for applications where space and weight are critical, such as on rooftops, vehicles, or portable devices. Thin-film cells can perform well in low-light conditions and are less affected by high temperatures. However, they typically have a shorter lifespan and can require more space to generate the same amount of electricity as crystalline silicon cells, making them less suitable for large-scale energy production.