These are facilities with solar panels made up of solar cells installed to generate electricity in isolated houses, mountain refuges, etc. They are handy due to the difficulty of connecting to the electrical grid. Sometimes these facilities are accompanied by some additional wind powersystem. This option consists of installing PV panels on the roof. The system is connected to the general electrical grid, and the over-production is sold to the. Sometimes connecting public lighting to the electricity grid is more expensive than installing a small photovoltaic panel with a battery on each streetlight. In this way, the solar lighting battery is charged during the day and transforms the accumulated energy into light at night. Solar thermal power plants use the sun's heat to generate electricity. Solar thermal power plants can be classified into parabolic troughs and solar towers. Parabolic trough solar thermal power plantshave long, curved mirrors that reflect and focus sunlight onto a. They are large extensions with photovoltaic panelsinstalled. The objective is to generate electricity to supply the electrical grid. Solar panels are often installed with a solar.