Renewable energy refers to energy sources that are regenerated by nature and are sustainable in supply. Renewable energy projects involve the installation of devices and/or systems that generate energy (e.g., electricity or heat) or displace energy use through the use of renewable energy resources.

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Examples of technologies include photovoltaics, active or passive solar systems, hydropower, hydroturbines, geothermal energy, and wind turbines. Several of these technologies are discussed in more detail in this section.