
Solar power, also known as solar electricity, is the conversion of energy from into , either directly using (PV) or indirectly using . use the to convert light into an . Concentrated solar power systems use or mirrors and systems to focus a large area of sunlight to a hot spot, often t.

Renewable energy (or green energy) is from that are replenished on a . The most widely used renewable energy types are , , and . and are also significant in some countries. Some also consider , although this is controversial. Rene.

A Renewable energy credit (REC) is a certificate corresponding to the environmental attributes of energy produced from renewable sources such as wind or solar. RECs were created as a means to track progress towards and compliance with states' Renewable Portfolio Standards (RPS), meant to support a cleaner generation mix. RECs should not be confused with the tax credits that renewable energy projects are eligible to r.

不可再生能源,又稱非再生能源,与对应,是无法经过短时间内再生的能源,而且它們的消耗速度遠遠超過它們再生的速度。、、等与、等均属于不可再生能源,如該能源一旦耗盡,將不能開採出更多的可用儲備供將來使用。

Renewable energy is usually understood as energy harnessed from continuously occurring natural phenomena. The defines it as "energy derived from natural processes that are replenished at a faster rate than they are consumed". , , , energy, and are widely agreed to be the main types of rene.