Reduces reliance on fossil fuels and associated CO₂ emissions

Lowers air pollutants (e.g., SO₂, NOₓ, particulate matter) during operation

Diversifies energy supply and reduces fuel import dependence

Uses locally available resources (sun, wind)

Declining costs for key technologies (especially solar PV and wind)

Job creation in manufacturing, installation, operations, and maintenance

Solar photovoltaic (PV)

Concentrated solar power (CSP)

Solar thermal (water/space heating)

Onshore wind

Offshore wind

Run-of-river

Reservoir-based

Pumped storage (often used for storage/grid balancing)

Power generation (high-temperature resources)

Direct use (heating)

Enhanced geothermal systems (EGS, emerging)

Solid biomass (wood, pellets)

Biogas (anaerobic digestion)

Biofuels (ethanol, biodiesel, SAF)

Tidal range and tidal stream

Wave energy

Ocean thermal energy conversion (OTEC)

Renewable: replenishes naturally

Sustainable: considers full lifecycle impacts (land, water, biodiversity, supply chains)

Some renewables vary with weather/time (solar, wind)

Others can be dispatchable or steadier (geothermal, some hydro, biomass)

The ratio of actual energy produced to maximum possible if run at full power continuously

Influenced by resource quality (sun hours, wind speeds) and technology

Power (kW, MW): instant rate of production

Energy (kWh, MWh): amount produced over time

Converting sunlight into usable energy (electricity or heat)

How it works (high level)

Key components

Common system types

Performance drivers

Advantages

Limitations

Typical uses

How it works (high level)

Thermal storage

Best-fit conditions

Uses

Benefit

Converting the kinetic energy of moving air into electricity

Wind turns blades (rotor), spinning a shaft

Generator converts mechanical energy into electrical energy

Power electronics condition output for the grid

Rotor blades and hub

Nacelle (gearbox in many designs, generator, control systems)

Tower and foundation

Yaw system (turns turbine to face wind)

Pitch control (adjusts blade angle to optimize power and limit loads)

Typical characteristics

Siting considerations

Why it’s attractive

Technology types

Challenges

Wind speed (power increases roughly with the cube of wind speed)

Turbine height and rotor diameter (accesses stronger winds, captures more energy)

Wake effects (turbines reduce wind for those behind; affects wind farm layout)

Low operating emissions; no fuel

Often complements solar (wind may be stronger at night or in different seasons)

Variable output; depends on weather systems

Siting and permitting challenges (community acceptance, wildlife concerns)

Geographic diversity (spreading sites reduces correlated downtime)

Forecasting (weather-based generation prediction)

Flexible demand (demand response, time-of-use pricing)

Transmission expansion to connect resource-rich areas

Distribution upgrades for high rooftop solar penetration

Inverters and grid-forming capabilities (advanced controls for stability)

Batteries (fast response; short-to-medium duration)

Pumped hydro storage (large-scale; longer duration)

Thermal storage (common with CSP; also district heating)

Hydrogen and other long-duration options (emerging; efficiency and cost challenges)

Microgrids and backup systems (solar + storage, diesel hybrid)

Diversified portfolio (solar + wind + hydro/geothermal/biomass where available)

Manufacturing emissions and materials (silicon, steel, rare earths in some turbines)

End-of-life recycling and waste management (PV modules, blades, batteries)

Siting to reduce biodiversity impacts

Mitigation measures (wildlife monitoring, curtailment, habitat restoration)

Local benefits (jobs, lease payments, tax revenue)

Addressing concerns (noise, views, equity, participation)

Grids balance multiple sources plus storage and flexible demand

Dispatchable renewables and interconnections support reliability

They reduce emissions but still have material, land, and ecological footprints

Best practices and recycling reduce impacts

Costs have fallen dramatically; total cost depends on location, financing, and grid needs