Sylvie Willis
Energy sources that are not derived from fossil fuels are known as non-fossil fuel energy sources. Fossil fuels, such as coal, oil, and natural gas, are non-renewable resources that have been used for energy for much of human history. However, they have harmful effects on the environment and contribute significantly to greenhouse gas emissions. To address the climate crisis, there is a growing emphasis on transitioning to non-fossil fuel energy sources, which are renewable, cleaner, and more sustainable. Two prominent examples of non-fossil fuel energy sources are solar power and wind power.
| Characteristics | Values |
|---|---|
| Two non-fossil fuel energy sources | Solar and wind power |
| Type of energy | Renewable |
| Source | Natural sources that are replenished at a higher rate than they are consumed |
| Environmental impact | Low or no environmental impact in their creation or use |
| Carbon emissions | Low- or zero-carbon footprint |
| Other emissions | No harmful greenhouse gas emissions |
| Cost | Solar power is often the cheapest form of electricity |
| Accessibility | Available to every country |
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What You'll Learn
Solar energy
The cost of manufacturing solar panels has decreased significantly in recent years, making solar energy more accessible and often the cheapest form of electricity. Solar energy use has been growing rapidly, and it is now an important part of the energy mix in many countries, including the United States, which has some of the richest solar resources globally.
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Wind power
Wind turbines can be built on land or in the ocean, in remote or urban areas, and can power individual homes, farms, or communities, or contribute to a power plant. They can also be hooked up to other sources of energy in hybrid plants, such as solar panels and batteries. Wind farms can take advantage of wind currents across the United States and along its coastlines, and provide financial benefits and economic advantages, such as reduced utility bills, tax credits, and the ability to sell extra energy.
Wind energy is an old concept, with ancient Egyptians using wind power to propel their boats down the Nile River, and Persians developing windmills in the 10th century CE. Today, wind energy is an important part of the energy mix, providing a renewable, affordable, and reliable source of energy that helps to reduce carbon dioxide emissions and address the climate crisis.
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Hydroelectric power
Hydropower, or hydroelectric power, is a renewable source of energy that relies on the endless, constantly recharging system of the water cycle to produce electricity. It is one of the oldest sources of energy for producing mechanical and electrical energy. Hydropower uses a dam or diversion structure to alter the natural flow of a river or other body of water. The kinetic energy of the flowing water is then converted into electricity through the use of turbines and generators. The greater the water flow and the higher the change in elevation, the more electricity can be produced.
Hydropower facilities come in many types, including run-of-the-river systems and pumped storage systems. In run-of-the-river systems, the force of the river's current applies pressure on a turbine, which may be assisted by a weir that diverts the water flow. In pumped storage systems, water is pumped from a water source up to a storage reservoir at a higher elevation. During periods of peak electricity demand, the water is released from the upper reservoir to power hydro turbines located below. Pumped-storage systems are efficient and economical, as they allow for the storage of water during light loads and electricity production during peak demand.
Hydropower has several advantages as an energy source. Firstly, it is continually renewable due to the recurring nature of the hydrologic cycle. Secondly, it does not produce thermal pollution, although some dams can produce methane through the decomposition of vegetation underwater. Hydropower is particularly well-suited for areas with heavy rainfall and hilly or mountainous regions that are reasonably close to main load centres. Small-scale hydro is often considered more environmentally friendly, especially for remote communities, as the infrastructure required for large-scale hydropower can have adverse effects on ecosystems.
The use of hydropower has a long history. Thousands of years ago, people used hydropower to turn paddle wheels on rivers to grind grain. The first industrial use of hydropower to generate electricity in the United States was in 1880 at the Wolverine Chair Factory in Grand Rapids, Michigan. In 2019, hydropower was the largest source of renewable energy in the electricity sector, accounting for more than 18% of the world's total power generation capacity. While hydropower generation has decreased in the United States due to the increasing use of other energy sources, it still accounted for 6.2% of total U.S. utility-scale electricity generation in 2022.
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Geothermal energy
Geothermal heating is the use of geothermal energy to heat buildings and water for human use. Geothermal heat pumps provide heating and cooling by using the ground as a heat sink, absorbing excess heat when above-ground temperatures are warmer, and as a heat source when they are cooler. District heating and cooling systems use one or more types of geothermal systems, such as a series of geothermal heat pumps, to heat and cool groups of buildings, campuses, and even entire communities.
Geothermal direct-use applications employ wells, usually deeper than those for heat pumps, to draw hot water from the subsurface to directly provide hot water to buildings, space heating, or heat for industrial processes ranging from fish farming and greenhouses to drying pulp, paper, lumber, and other materials.
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Biofuels
While biofuels offer a renewable alternative, their environmental impact should be carefully considered. The large-scale production of biofuels can lead to negative consequences, such as deforestation and land-use changes. Additionally, the conversion rate of cellulosic ethanol, a second-generation biofuel, is lower than that of first-generation biofuels, limiting its usage. Nevertheless, advancements in technology are being made to develop next-generation biofuels from wastes, cellulosic biomass, and algae-based resources. These next-generation biofuels aim to serve as direct petroleum substitutes, making them even more viable as a renewable energy source.
The terminology and definitions of biofuels can vary across government legislation, incentive programs, and industry practices. For example, the names of biofuels may include prefixes such as "bio" or adjectives like "advanced," "alternative," or "sustainable." Despite these variations, biofuels offer a promising path towards reducing our dependence on fossil fuels and mitigating the impacts of the climate crisis.
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Frequently asked questions
Two non-fossil fuel energy sources are solar and wind power.
Solar power is a renewable energy source that generates electricity by capturing sunlight on solar panels. It is the most abundant energy resource and can be harnessed even in cloudy weather.
Wind power is another renewable energy source that harnesses the kinetic energy of moving air using large wind turbines located on land or in water.
