LEED AP with Operations and Maintenance (O+M ) Practice Exam

What type of energy sources are considered renewable?

1. Coal and natural gas

2. Geothermal and solar energy

3. Nuclear energy and hydroelectric power

4. Fossil fuels and biomass

The correct answer is: Geothermal and solar energy

Renewable energy sources are those that are naturally replenished and have the potential to be used sustainably without depleting natural resources. Geothermal energy and solar energy fit this definition perfectly. Geothermal energy harnesses heat from beneath the Earth's surface, which is continuously generated by the Earth's internal heat and can be utilized for heating and electricity generation. This resource is virtually abundant in volcanic regions, contributing to its renewable status. Solar energy captures sunlight using photovoltaic cells or solar thermal systems, converting it into electricity or heat. As the sun shines daily and is expected to do so for billions of years, solar energy is another quintessential renewable energy source. In contrast, the other options listed include energy sources that are not renewable. For instance, coal and natural gas are fossil fuels, formed over millions of years from the remains of ancient organisms; they are finite and release greenhouse gases when burned. Nuclear energy, while low in carbon emissions during operation, relies on uranium mining, which is a non-renewable process. Hydroelectric power, while renewable in principle, can affect ecosystems and water supplies. Lastly, although biomass can be renewable if sourced sustainably, it can still contribute to deforestation or other negative environmental impacts if mismanaged. Thus, the focus on