Energy Transition and Renewable Energy

Introduction

The energy transition is the transformation of energy systems from their existing structures toward more sustainable, secure, affordable, and lower-emission arrangements. It involves changes in how energy is produced, transported, stored, distributed, and consumed.

The transition is driven by several factors: climate change mitigation, energy security, technological innovation, public health, industrial policy, and concerns about dependence on imported fuels. Its pace and design vary according to national resources, infrastructure, economic conditions, and development priorities.

Renewable energy is a major component of the transition, but the transition is broader than replacing fossil fuels with renewables. It also involves energy efficiency, electrification, grid modernization, storage, changes in industrial processes, and measures to maintain reliability and affordability.

The shift is reshaping international relations because it affects fossil-fuel exporters, energy importers, mineral-producing countries, technology suppliers, investment flows, and strategic supply chains. The International Energy Agency’s 2026 critical minerals outlook highlights the growing importance of mineral supply-chain resilience for energy technologies and other strategic industries.

Core Concepts

Energy transition: The structural transformation of energy production and consumption, including changes in energy sources, technologies, infrastructure, and markets.

Renewable energy: Energy derived from sources that are naturally replenished, including sunlight, wind, water flows, geothermal heat, and sustainably managed bioenergy.

Clean energy: A broad term for energy sources and technologies associated with low or reduced pollution and emissions. Its precise meaning varies by policy framework and technology.

Low-carbon energy: Energy that produces relatively low greenhouse gas emissions over its life cycle compared with higher-emission alternatives.

Energy security: The reliable availability of energy at affordable prices, supported by resilient infrastructure and manageable supply risks.

Energy independence: The degree to which a country can meet its energy needs without relying on external suppliers. Complete independence is uncommon in interconnected energy markets.

Energy sovereignty: A concept emphasizing a country’s or community’s capacity to shape its energy system and exercise control over important energy decisions.

Energy access: The availability of affordable, reliable, and suitable energy services for households, businesses, and public institutions.

Energy poverty: A condition in which people lack adequate access to energy services needed for heating, cooling, cooking, lighting, mobility, and other essential activities.

Energy efficiency: The provision of the same or improved energy services using less energy.

Renewable Energy Sources

Solar photovoltaic energy: Electricity generated when photovoltaic cells convert sunlight directly into electrical energy.

Concentrated solar power (CSP): A technology that uses mirrors or lenses to concentrate sunlight and produce heat, which can be used to generate electricity or support other processes.

Wind energy: Energy captured from moving air using wind turbines or other technologies.

Hydropower: Electricity generated from moving or falling water, usually through turbines.

Geothermal energy: Energy derived from heat within the Earth, used for electricity generation or direct heating where conditions permit.

Bioenergy: Energy produced from organic materials, including certain agricultural residues, forestry products, organic waste, and purpose-grown biomass.

Marine energy: Energy captured from ocean waves, tides, currents, or temperature differences.

Distributed generation: Electricity produced near the point of consumption, such as rooftop solar or small-scale local generation.

Utility-scale renewable energy: Renewable generation facilities designed to supply electricity to grids or large customers at substantial scale.

Renewable energy integration: The incorporation of renewable generation into electricity systems while maintaining reliability, affordability, and operational stability.

Electricity Systems and Energy Infrastructure

Electricity grid: The interconnected network that transports electricity from generators to consumers.

Grid modernization: Upgrading electricity networks, control systems, and equipment to improve reliability, efficiency, flexibility, and the integration of new technologies.

Smart grid: An electricity system that uses digital monitoring, communication, and control technologies to improve coordination between generation, networks, and consumption.

Energy storage: Technologies that retain energy for later use, including batteries, pumped-storage hydropower, thermal storage, and other systems.

Battery energy storage system (BESS): A system that stores electricity in batteries and releases it when needed.

Demand response: Changes in electricity consumption in response to prices, grid conditions, or system requests.

Load balancing: The management of electricity supply and demand to maintain system stability.

Interconnection: A physical or contractual connection between electricity networks or energy systems, potentially enabling cross-border trade.

Transmission infrastructure: High-capacity networks that move electricity over long distances.

Distribution network: The local network delivering electricity to end users.

Capacity factor: The ratio of actual energy produced by a generator over a period to the amount it would produce if operating continuously at its rated capacity.

Dispatchable generation: Generation that can be adjusted or scheduled according to system requirements, subject to technical and operational constraints.

Variable renewable energy: Renewable generation whose output depends on changing environmental conditions, especially solar and wind resources.

Decarbonization and Energy Policy

Decarbonization: The reduction of carbon dioxide emissions associated with energy and economic activities.

Electrification: Replacing technologies that use direct fossil-fuel combustion with electric alternatives, such as electric vehicles and electric heat pumps.

Green hydrogen: Hydrogen produced through methods that use renewable energy and have low associated emissions under the relevant production pathway and accounting framework.

Low-carbon hydrogen: Hydrogen produced through a pathway with relatively low greenhouse gas emissions, assessed across the relevant production process.

Carbon capture and storage (CCS): The capture of carbon dioxide from specified sources and its transport and storage in suitable geological formations.

Carbon capture, utilization and storage (CCUS): A broad group of processes that capture carbon dioxide for use or storage, depending on the technology and application.

Carbon pricing: Policies that place a price on greenhouse gas emissions, including carbon taxes and emissions trading systems.

Fossil-fuel phase-down: A reduction in the use or production of fossil fuels over time.

Fossil-fuel phase-out: The ending of specified fossil-fuel activities or uses according to an agreed policy or timeline.

Just transition: An approach that considers workers, communities, affordability, and social equity during the shift toward lower-emission energy and economic systems.

Energy subsidy reform: Changes to public support for energy prices or production, often intended to improve fiscal efficiency, reduce distortions, or support environmental objectives. Reform design affects households and businesses differently.

Energy Geopolitics

Energy geopolitics: The study of how energy resources, infrastructure, trade, and technologies shape power and relationships among states.

Petropolitics: The political dynamics associated with oil production, revenues, markets, and influence.

Gas geopolitics: The strategic relationships shaped by natural gas supplies, pipelines, liquefied natural gas markets, and related infrastructure.

Energy interdependence: Mutual reliance among countries or regions for energy supplies, markets, infrastructure, or technologies.

Energy diplomacy: Diplomatic engagement over energy trade, investment, supply security, infrastructure, technology, and market access.

Energy weaponization: The use or threatened use of energy supply, pricing, or infrastructure as an instrument of political or strategic pressure.

Energy corridor: A route or network through which energy resources are transported between producers, transit states, and consumers.

Pipeline politics: Political and strategic competition over pipeline routes, transit arrangements, ownership, and supply access.

Liquefied natural gas (LNG): Natural gas cooled into liquid form to facilitate storage and transportation, particularly by ship.

Strategic petroleum reserve: A stock of petroleum maintained to help manage supply disruptions and emergencies.

Energy market volatility: Significant fluctuations in energy prices or availability that can affect consumers, producers, and national economies.

Critical Minerals and Supply Chains

Critical mineral: A mineral considered essential for important economic or strategic activities and subject to significant supply risks.

Lithium: A mineral used in many rechargeable battery technologies and other industrial applications.

Cobalt: A mineral used in some battery chemistries and industrial applications, with supply chains concentrated in particular producing regions.

Nickel: A metal used in stainless steel and some battery technologies.

Graphite: A form of carbon used in applications including battery anodes and industrial products.

Rare earth elements: A group of 17 elements important in applications such as permanent magnets, electronics, and certain clean-energy technologies.

Mineral processing: The treatment and refinement of extracted materials to produce usable mineral products.

Supply-chain concentration: Dependence on a limited number of suppliers, producers, processors, or transport routes.

Supply-chain diversification: Reducing dependence on a narrow set of sources by developing additional suppliers, production locations, technologies, or recycling capacity.

Resource nationalism: Policies that seek greater domestic control over resource extraction, processing, trade, or revenues.

Recycling and material recovery: Processes that recover useful materials from discarded products or industrial waste, potentially reducing demand for newly extracted resources.

Economic and Social Dimensions

Stranded asset: An asset that loses economic value or becomes unusable earlier than expected because of market, technological, regulatory, or environmental changes.

Carbon lock-in: Dependence on high-emission infrastructure and systems that makes future emission reductions more difficult or costly.

Energy affordability: The ability of households and businesses to pay for the energy services they need.

Energy reliability: The ability of an energy system to provide services consistently and withstand ordinary disruptions.

Energy-system flexibility: The ability of an energy system to respond to changes in supply and demand through storage, generation, interconnection, and demand management.

Green industrial policy: Government measures intended to develop industries and technologies that contribute to environmental objectives.

Technology transfer: The sharing of technology, knowledge, and expertise across countries or organizations.

Climate-compatible development: Development that integrates economic and social progress with climate mitigation and adaptation.

Energy transition finance: Funding for investments and measures that transform energy systems toward lower-emission and more resilient arrangements.

Key Distinctions

Key Terms at a Glance

• Net-zero emissions: Balancing specified human-caused greenhouse gas emissions with removals over a defined period.

• Power purchase agreement (PPA): A contract setting out terms for the sale and purchase of electricity.

• Feed-in tariff: A policy mechanism that provides a specified payment for electricity generated from eligible sources.

• Renewable portfolio standard: A policy requiring a specified share of electricity to come from renewable sources.

• Green bond: A bond whose proceeds are allocated to eligible environmental or climate-related projects.

• Capacity adequacy: The ability of an electricity system to meet demand with an appropriate level of reliability.

• Energy intensity: Energy consumed per unit of economic output or another defined measure of activity.

• Lifecycle emissions: Emissions associated with a product or technology across specified stages of its life cycle.

• Energy transition mineral: A mineral used in technologies supporting changes in energy production, storage, transmission, or consumption.

• Energy transition risk: Financial, economic, or social risk arising from changes in energy technologies, markets, policies, or demand.

Related Glossaries

• 8.1 International Political Economy: Core Concepts

• 8.3 Global Finance and Monetary Relations

• 12.4 Chokepoints, Corridors and Strategic Locations

• 12.5 Resources, Energy and Geoeconomics

• 12.6 Critical Minerals and Strategic Resources

• 17.4 Sustainable Development and SDGs

• 18.1 Climate Change and Global Warming

• 18.2 Climate Security and Climate Diplomacy

• 18.3 Climate Finance and Climate Justice

• 18.7 Biodiversity and Global Environmental Governance

Conclusion

The energy transition is simultaneously a climate, economic, technological, and geopolitical transformation. Renewable energy can reduce dependence on fossil fuels, but its expansion also requires reliable electricity networks, storage, investment, skilled workers, and responsible mineral supply chains. Countries face different opportunities and constraints, making energy security, affordability, international cooperation, and a just transition central to successful policy.