alternative energy

Renewable Energy

Energy sourced from natural processes that are continuously replenished, such as solar, wind, and hydroelectric.

Examples of Renewable Energy Sources

Solar, wind, geothermal, and hydroelectric.

Nonrenewable Resources

Energy sources that cannot be replenished within a human timeframe, mainly fossil fuels like petroleum and natural gas.

Hydroelectric Energy in New Zealand

67% of New Zealand's electricity is generated from hydroelectric power.

Benefits of Renewable Energy

Reduces air pollution, eliminates oil spills, and decreases the need for living near power plants.

Factors for Evaluating Energy Sources

Reliability, accessibility, environmental impacts of extraction, and cost.

Active Solar Energy

Uses devices to focus and store solar energy, such as solar panels.

Passive Solar Energy

Maximizes sunlight absorption and helps maintain interior temperatures.

Cons of Solar Energy

Sunlight inconsistency, use of toxic chemicals in production, potential ecosystem damage.

Wind Energy

Harnesses kinetic energy from wind, suitable in areas with consistent winds.

Ecological Footprint of Wind Energy

Has a small environmental impact relative to the energy produced.

Cons of Wind Energy

Noise pollution and risk to wildlife.

Hydroelectric Power

Generates electricity using dams and flowing water.

Cons of Hydroelectric Power

Limited to water-rich areas, can disrupt local ecosystems and fish migration.

Environmental Impacts of Hydroelectric Power

Fossil fuels for dam construction, water temperature changes, and creation of stagnant lakes.

Tidal Power

Generates energy from the kinetic energy of ocean tides.

Geothermal Energy

Energy harnessed from heat beneath the Earth's surface, using steam to generate power.

Cost of Geothermal Installation

High initial costs but low operational costs.

Environmental Impacts of Geothermal Energy

Affects groundwater and has lower emissions compared to coal.