Glossary

Energy derived from natural processes that are replenished on a human timescale. Includes solar, wind, hydropower, geothermal, and biomass. Unlike fossil fuels, renewable sources do not deplete finite resources.

Electricity generated from sunlight, either through photovoltaic (PV) panels that convert light directly into electricity, or concentrated solar power (CSP) plants that use mirrors to focus sunlight and generate heat for steam turbines.

Electricity generated by wind turbines that convert the kinetic energy of moving air into electrical power. Includes both onshore (land-based) and offshore (ocean-based) installations.

Electricity generated by harnessing the energy of flowing or falling water. Typically produced by dams that create reservoirs, but also includes run-of-river and pumped-storage systems. The oldest and most widely used renewable energy source globally.

Energy derived from heat within the Earth's interior. Used for electricity generation through steam turbines and for direct heating applications. Concentrated in regions with volcanic or tectonic activity, such as Iceland and East Africa.

Energy produced from organic materials such as wood, agricultural waste, or dedicated energy crops. Can be burned directly for heat or converted into biogas and biofuels. Classified as renewable when sourced sustainably.

Electricity generated by nuclear fission reactions. While low-carbon, it is not classified as renewable because it relies on finite uranium resources. Renewable Nodes includes an optional "Include Nuclear" toggle to show combined clean energy share.

Non-renewable energy sources formed from ancient organic matter over millions of years. Includes coal, oil, and natural gas. Burning fossil fuels releases carbon dioxide and other greenhouse gases that contribute to climate change.

The percentage of a country's total electricity generation that comes from renewable sources. This is the primary metric used in Renewable Nodes rankings. A country with 60% renewable share generates 60% of its electricity from solar, wind, hydro, geothermal, or biomass.

The maximum electrical output a power plant or collection of plants can produce under ideal conditions, measured in gigawatts (GW). One GW is equivalent to 1,000 megawatts or roughly the output of a large nuclear reactor. Capacity differs from actual generation due to capacity factors.

The ratio of actual energy output to the maximum possible output over a given period. Solar panels might have a 15–25% capacity factor (since the sun doesn't always shine), while hydropower can reach 40–60%. This explains why installed capacity doesn't directly translate to generation share.

Renewable energy capacity divided by population (in millions). This metric normalizes capacity by country size, revealing which nations invest the most in renewables relative to their population. Available in Renewable Nodes via the "Per Capita GW" view.

The change in renewable energy share compared to the previous year, measured in percentage points. A YoY of +2.5 means a country's renewable share increased by 2.5 percentage points compared to the prior year.

The global shift from fossil fuel-based energy systems to renewable and low-carbon alternatives. Driven by climate targets, technological advances, and declining costs of solar and wind power.

A letter grade assigned to each country based on its renewable energy share: A+ (≥90%), A (≥75%), B (≥60%), B- (≥45%), C (≥30%), D (≥15%), F (<15%). The grade provides a quick visual indicator of how far along a country is in its energy transition.

A percentage showing how close a country is to meeting its stated renewable energy target. Calculated as (current renewable share ÷ target share) × 100. Countries that have already met or exceeded their target show 100%.

Visual indicators awarded to countries for notable achievements: "95%+ Renewable" or "90%+ Renewable" for high renewable share, "100+ GW Capacity" for large installed capacity, "Transformation Leader" for significant YoY growth, and "Near 2030 Target" for countries close to their renewable energy goals.

An independent energy think tank that provides open-source global electricity data. Ember's data covers electricity generation by source, updated monthly for most countries. Primary source for renewable share percentages on Renewable Nodes.

The International Renewable Energy Agency, an intergovernmental organization supporting countries in their transition to sustainable energy. Provides authoritative data on renewable energy capacity, investment, and policy frameworks worldwide.

The International Energy Agency, an autonomous intergovernmental organization providing policy recommendations, analysis, and data on the global energy sector. IEA data is used for cross-referencing and supplementing country-level statistics.