Climate Change and Sustainable Energy
Expert-defined terms from the Certificate in Energy Planning and Policy course at London School of Planning and Management. Free to read, free to share, paired with a professional course.
Adaptation – Related terms #
climate resilience, vulnerability, adaptive capacity. Adaptation refers to adjustments in natural or human systems in response to actual or expected climate change impacts, aiming to reduce harm or exploit beneficial opportunities. For example, constructing flood‑defence levees in coastal cities protects against sea‑level rise. In energy planning, adaptation may involve redesigning transmission lines to withstand higher temperatures. Application: integrating climate‑risk assessments into power‑grid expansion projects. Challenges: high upfront costs, uncertainty in climate projections, and the need for cross‑sector coordination.
Afforestation – Related terms #
reforestation, carbon sequestration, land use change. Afforestation is the establishment of forest on lands that have not been forested for at least 50 years. It creates new carbon sinks that absorb CO₂ from the atmosphere. A practical example is planting fast‑growing eucalyptus on degraded farmland to generate timber and capture carbon. Application: inclusion of afforestation credits in renewable energy project financing. Challenges: competition with food production, biodiversity concerns, and long‑term monitoring of carbon permanence.
Bioenergy – Related terms #
biomass, biogas, biofuel, renewable energy. Bioenergy is energy derived from organic material such as wood, agricultural residues, or algae. It can be burned directly for heat, converted to electricity, or processed into liquid fuels like biodiesel. For instance, a sugarcane‑based ethanol plant supplies transportation fuel while utilizing waste bagasse for cogeneration. Application: combined heat and power (CHP) plants that use woody biomass to generate electricity and district heating. Challenges: land‑use competition, lifecycle emissions, and supply chain logistics.
Carbon Capture and Storage (CCS) – Related terms #
CO₂ sequestration, carbon capture, geological storage. CCS involves capturing CO₂ emissions from point sources (e.G., Power plants), transporting it, and injecting it into deep underground formations for long‑term storage. The Sleipner project in the North Sea has stored millions of tonnes of CO₂ since 1996. Application: retrofitting a coal‑fired plant with amine‑based capture technology to enable continued operation while meeting emissions caps. Challenges: high energy penalty, cost, public acceptance of underground storage, and verification of long‑term containment.
Carbon Pricing – Related terms #
carbon tax, emissions trading, market mechanisms. Carbon pricing assigns a monetary cost to each tonne of CO₂ emitted, incentivizing reductions. A carbon tax directly charges emitters, while cap‑and‑trade systems allocate emission allowances that can be bought and sold. Sweden’s carbon tax of >$120 per tonne has driven a shift toward low‑carbon fuels. Application: using carbon revenue to fund renewable‑energy subsidies or energy‑efficiency retrofits. Challenges: political resistance, setting an appropriate price level, and preventing carbon leakage.
Decarbonization – Related terms #
net zero, emissions reduction, low‑carbon transition. Decarbonization is the process of reducing carbon dioxide emissions across sectors to mitigate climate change. In the power sector, this may involve replacing coal plants with wind farms and adding battery storage. Application: national energy‑policy roadmaps that set phased targets for renewable‑energy share. Challenges: technology readiness, financing gaps, and ensuring a just transition for workers.
Distributed Generation (DG) – Related terms #
rooftop solar, micro‑grid, on‑site generation. DG refers to small‑scale electricity generation technologies located close to the point of consumption, reducing transmission losses. A typical DG system is a residential photovoltaic (PV) array that feeds excess power back to the grid via net metering. Application: community solar projects that allow renters to benefit from renewable energy without rooftop installations. Challenges: grid integration, variability management, and regulatory barriers.
Energy Efficiency – Related terms #
demand‑side management, conservation, performance standards. Energy efficiency means using less energy to provide the same service. Upgrading building insulation from R‑13 to R‑30 can cut heating demand by 30 %. Efficient electric motors and variable‑frequency drives in industry reduce electricity consumption. Application: energy‑audit programs that identify low‑cost retrofits for commercial buildings. Challenges: split‑incentive problems, rebound effect, and limited awareness of best practices.
Energy Storage – Related terms #
batteries, pumped hydro, thermal storage, grid stability. Energy storage systems capture energy for later use, helping balance supply and demand. Lithium‑ion batteries paired with solar PV smooth daily output, while pumped‑hydro storage provides large‑scale, multi‑hour capacity. Application: using battery banks to provide ancillary services such as frequency regulation. Challenges: cost decline, degradation over time, recycling, and resource constraints (e.G., Lithium, cobalt).
Fossil Fuel – Related terms #
coal, oil, natural gas, carbon intensity. Fossil fuels are hydrocarbon‑based energy sources formed from ancient organic matter. They dominate global energy supply but emit large quantities of CO₂ when combusted. A coal‑fired power plant may emit >0.9 Kg CO₂ per kWh generated. Application: transitional role for natural‑gas plants that can operate flexibly alongside renewables. Challenges: stranded‑asset risk, air‑quality impacts, and alignment with climate‑policy pathways.
Grid Modernization – Related terms #
smart grid, advanced metering, digitalization. Grid modernization involves upgrading transmission and distribution infrastructure with sensors, communication, and automation to improve reliability and accommodate variable renewables. For example, phasor measurement units (PMUs) provide real‑time voltage data for dynamic stability control. Application: demand‑response platforms that automatically curtail industrial loads during peak periods. Challenges: cybersecurity, investment financing, and interoperability standards.
Greenhouse Gas (GHG) – Related terms #
CO₂, methane, nitrous oxide, emissions inventory. GHGs are gases that trap heat in the atmosphere, driving climate change. Carbon dioxide is the most prevalent, but methane (CH₄) has a global warming potential over 20 times higher over a 100‑year horizon. Application: GHG accounting frameworks (e.G., ISO 14064) used by corporations to report emissions. Challenges: measurement accuracy, scope‑3 emissions tracking, and aligning inventories with national targets.
Hydropower – Related terms #
dam, run‑of‑river, pumped storage, renewable electricity. Hydropower generates electricity by converting the kinetic energy of flowing water into mechanical rotation and then electrical power. The Three Gorges Dam in China provides >20 GW of capacity. Small‑scale run‑of‑river projects can supply local communities with minimal reservoir impact. Application: using pumped‑storage hydropower as a large‑scale battery for grid balancing. Challenges: ecological disruption, sedimentation, and social displacement.
Intermittent Renewable – Related terms #
wind power, solar PV, variability, capacity factor. Intermittent renewables produce electricity only when the resource (wind, sunlight) is available, leading to fluctuating output. A 2 GW offshore wind farm may have a capacity factor of 45 % but still require backup or storage. Application: forecasting tools that predict hourly wind speeds to schedule generation. Challenges: integration with existing baseload generation, need for flexible storage, and market design that rewards reliability.
Life Cycle Assessment (LCA) – Related terms #
cradle‑to‑grave, environmental impact, carbon footprint. LCA evaluates the environmental impacts of a product or service from raw‑material extraction through disposal. For a solar panel, LCA accounts for manufacturing emissions, transport, installation, operation, and end‑of‑life recycling. Application: comparing the carbon intensity of wind turbines versus natural‑gas turbines over a 25‑year lifespan. Challenges: data availability, methodological consistency, and incorporating indirect effects such as land‑use change.
Mitigation – Related terms #
emissions reduction, climate policy, carbon removal. Mitigation comprises actions that limit the magnitude of climate change, primarily by reducing greenhouse‑gas emissions. Deploying large‑scale renewable energy, improving energy efficiency, and protecting carbon sinks are core mitigation strategies. Application: nationally determined contributions (NDCs) that set renewable‑energy targets under the Paris Agreement. Challenges: financing, technology transfer, and aligning mitigation with development goals.
Net Zero – Related terms #
carbon neutrality, offsetting, balance, climate ambition. Net‑zero refers to achieving a balance between emitted greenhouse gases and those removed from the atmosphere, typically by 2050. Companies may reach net‑zero by cutting operational emissions and purchasing high‑quality carbon offsets for residual emissions. Application: an electricity utility that retires coal plants, expands wind capacity, and invests in reforestation projects to neutralize remaining emissions. Challenges: ensuring the integrity of offsets, avoiding “greenwashing,” and managing transition costs.
Photovoltaic (PV) – Related terms #
solar panels, inverter, grid‑connected, rooftop. PV technology converts sunlight directly into electricity using semiconductor cells. A 5 kW residential PV system can offset ~6 t CO₂ per year, depending on local solar irradiance. Application: community solar farms that sell generated power through power purchase agreements (PPAs). Challenges: intermittency, land‑use competition for utility‑scale farms, and end‑of‑life recycling of panels.
Renewable Portfolio Standard (RPS) – Related terms #
renewable mandate, state policy, compliance market. RPS is a regulatory mechanism that requires utilities to obtain a certain percentage of their electricity from renewable sources. For example, California’s RPS targets 60 % renewable electricity by 2030. Application: renewable‑energy credit (REC) trading that allows generators to sell compliance certificates. Challenges: cost pass‑through to consumers, ensuring geographic diversity of resources, and preventing market manipulation.
Resilience – Related terms #
adaptive capacity, shock absorption, system robustness. Resilience is the ability of an energy system to anticipate, absorb, and recover from disruptions such as extreme weather events or cyber‑attacks. A resilient grid may include micro‑grids that can island themselves during a storm. Application: hardening transmission towers against higher wind speeds projected under climate scenarios. Challenges: balancing redundancy with cost, and integrating resilience metrics into planning tools.
Sustainable Development – Related terms #
SDGs, triple bottom line, equity, environmental stewardship. Sustainable development seeks to meet present needs without compromising future generations, encompassing economic growth, social inclusion, and environmental protection. In energy planning, this translates to delivering affordable, reliable power while minimizing emissions. Application: electrification projects that bring clean cooking to remote villages, improving health and reducing deforestation. Challenges: trade‑offs between rapid access and long‑term environmental impacts, financing constraints, and governance.
Transition Risk – Related terms #
policy risk, technology risk, stranded assets, climate finance. Transition risk arises from the shift to a low‑carbon economy, potentially devaluing assets tied to high‑emission activities. Investors may face losses if coal plants become non‑viable before the end of their technical life. Application: scenario analysis used by pension funds to assess exposure of their energy‑portfolio to carbon‑pricing regimes. Challenges: uncertainty in policy pathways, lack of transparent data on asset carbon intensity, and aligning stakeholder expectations.
Urban Heat Island (UHI) – Related terms #
city microclimate, albedo, green roofs, cooling demand. UHI describes higher temperatures in urban areas compared to surrounding rural lands, driven by heat‑absorbing surfaces and reduced vegetation. This increases electricity demand for air‑conditioning. Implementing reflective roofing and extensive tree planting can mitigate UHI effects. Application: city planning that integrates cool pavements to lower peak demand on the grid. Challenges: retrofitting existing built environments, financing public‑infrastructure upgrades, and measuring long‑term effectiveness.
Virtual Power Plant (VPP) – Related terms #
aggregation, demand response, distributed resources, energy management system. A VPP aggregates dispersed energy resources—such as residential batteries, rooftop PV, and small‑scale generators—to operate as a single, dispatchable plant. By coordinating output via a central software platform, a VPP can provide frequency regulation or peak‑shaving services. Application: a utility contracts a VPP to balance variable wind output without building additional fossil‑fuel peaker plants. Challenges: data communication latency, regulatory acceptance, and ensuring participant remuneration.
Wind Energy – Related terms #
turbine, offshore wind, capacity factor, wind farm. Wind energy captures kinetic energy from moving air using turbines connected to generators. Offshore wind farms benefit from higher and more consistent wind speeds, achieving capacity factors of 50 % or more. A 1 GW offshore project can supply electricity to >600,000 homes. Application: power purchase agreements that lock in long‑term revenue for wind developers. Challenges: visual and ecological impacts (e.G., Bird collisions), high capital cost, and need for high‑voltage transmission to grid interconnections.
Zero‑Emission Vehicle (ZEV) – Related terms #
electric vehicle, fuel‑cell vehicle, charging infrastructure, transportation decarbonization. ZEVs emit no tailpipe pollutants; they are powered either by batteries (BEVs) or hydrogen fuel cells (FCEVs). Adoption of ZEVs reduces oil demand and urban air pollution. Norway’s fleet composition now exceeds 70 % BEVs, driven by generous incentives. Application: public‑charging networks that integrate renewable energy sources to ensure truly zero‑emission operation. Challenges: battery raw‑material supply chains, charging‑infrastructure rollout, and consumer range anxiety.
Carbon Budget – Related terms #
cumulative emissions, temperature target, IPCC, emissions pathway. A carbon budget quantifies the total amount of CO₂ that can be emitted while limiting global warming to a specific threshold (e.G., 1.5 °C). The remaining budget guides national and sectoral mitigation planning. Application: allocating portions of the global budget to the power sector to set renewable‑energy share targets. Challenges: accurate accounting of historic emissions, integrating non‑CO₂ gases, and ensuring equitable distribution among countries.
Demand‑Side Management (DSM) – Related terms #
load shifting, energy efficiency, smart appliances, tariff design. DSM programs influence consumer electricity usage patterns to align demand with supply, often through price signals or automated controls. A time‑of‑use tariff encourages industrial users to run high‑energy processes during off‑peak hours, reducing peak load. Application: smart‑thermostat programs that temporarily adjust HVAC setpoints during grid stress events. Challenges: consumer engagement, rebound effects, and the need for advanced metering infrastructure.
Energy Poverty – Related terms #
access, affordability, fuel insecurity, social equity. Energy poverty occurs when households lack reliable, affordable, and clean energy services. In many developing regions, reliance on kerosene lamps leads to health hazards and high expenditures. Providing off‑grid solar home systems can lift families out of energy poverty. Application: micro‑financing models that enable low‑income households to purchase solar kits with pay‑as‑you‑go plans. Challenges: financing risk, maintenance support, and ensuring long‑term sustainability of installations.
Fuel‑Cell Technology – Related terms #
hydrogen, electrochemical conversion, PEM, solid‑oxide. Fuel cells generate electricity through an electrochemical reaction between hydrogen and oxygen, producing only water and heat as by‑products. Proton‑exchange‑membrane (PEM) fuel cells are used in vehicles, while solid‑oxide fuel cells can operate on natural gas for stationary power. Application: backup power systems for data centers that run on hydrogen produced from renewable electrolysis. Challenges: hydrogen production cost, storage safety, and durability of cell components.
Geothermal Energy – Related terms #
heat pump, binary cycle, deep drilling, renewable heat. Geothermal energy exploits the Earth’s internal heat for electricity generation or direct heating. Binary‑cycle plants use a secondary fluid with a low boiling point to drive turbines, allowing exploitation of moderate‑temperature resources. A geothermal district‑heating system can supply hot water to thousands of homes with low emissions. Application: coupling geothermal heat pumps with building retrofits to achieve high‑efficiency space heating. Challenges: high upfront drilling costs, site‑specific resource availability, and potential induced seismicity.
Hydrogen Economy – Related terms #
green hydrogen, electrolyzer, fuel cell, decarbonization pathway. The hydrogen economy envisions hydrogen as a versatile energy carrier for transport, industry, and power generation. Green hydrogen is produced via electrolysis powered by renewable electricity, offering zero‑carbon fuel for hard‑to‑abate sectors like steelmaking. Application: large‑scale electrolyzer farms co‑located with offshore wind farms to store excess generation as hydrogen. Challenges: scaling electrolyzer capacity, transport infrastructure (pipelines, liquefaction), and market price competitiveness.
International Climate Agreements – Related terms #
Paris Agreement, COP, NDC, global governance. These treaties coordinate global action on climate change, setting collective targets and reporting mechanisms. The Paris Agreement’s “bottom‑up” approach relies on nationally determined contributions (NDCs) to achieve the overarching temperature goal. Application: aligning national energy‑policy frameworks with pledged NDCs to secure international climate finance. Challenges: compliance monitoring, differing national capacities, and translating global goals into concrete sectoral actions.
Life‑Cycle Costing (LCC) – Related terms #
total cost of ownership, economic analysis, discount rate. LCC evaluates all costs associated with an asset over its entire lifespan, including acquisition, operation, maintenance, and disposal. For a solar PV system, LCC considers panel degradation, inverter replacement, and eventual recycling. Application: comparing LCC of a natural‑gas peaker plant versus a battery storage system for peak‑load management. Challenges: forecasting future electricity prices, discount rate selection, and incorporating externalities such as carbon costs.
Microgrid – Related terms #
islanding, local control, distributed resources, resilience. A microgrid is a localized network of electricity sources and loads that can operate autonomously from the main grid. It may include PV panels, diesel generators, and battery storage, coordinated by a central controller. During a grid outage, the microgrid can sustain critical facilities like hospitals. Application: campus‑wide microgrid that integrates solar, battery, and demand‑response to reduce grid dependency. Challenges: control‑algorithm complexity, regulatory barriers, and ensuring seamless transition between grid‑connected and islanded modes.
Nationally Determined Contribution (NDC) – Related terms #
climate pledge, mitigation target, transparency framework. An NDC is a country‑specific climate action plan submitted under the Paris Agreement, outlining emissions‑reduction goals and adaptation measures. The ambition level of NDCs determines the collective pathway to stay below 2 °C warming. Application: using NDC targets to set national renewable‑energy capacity mandates. Challenges: political feasibility, financing gaps, and periodic revision to increase ambition.
Off‑Grid Renewable Systems – Related terms #
standalone solar, mini‑hydro, diesel‑replacement, energy access. Off‑grid systems provide electricity in locations not served by centralized grids, often using a combination of renewable generation and storage. A solar‑home system with a battery can supply lighting and phone charging for remote households. Application: NGOs deploying solar lanterns to replace kerosene in sub‑Saharan villages. Challenges: supply‑chain logistics, maintenance capacity, and ensuring affordability.
Power Purchase Agreement (PPA) – Related terms #
contract, off‑take, renewable procurement, financial instrument. A PPA is a long‑term contract where a buyer agrees to purchase electricity from a generator at a predetermined price. Corporate PPAs enable firms to source renewable electricity directly, supporting their sustainability goals while providing developers with financing certainty. Application: a tech company signs a 15‑year PPA for a 200 MW wind farm, locking in low‑carbon power. Challenges: price volatility, regulatory risk, and aligning contract terms with corporate accounting standards.
Renewable Energy Certificates (RECs) – Related terms #
tracking, compliance market, green attribute, tradable credit. RECs represent the environmental attributes of one megawatt‑hour of renewable electricity generation. They can be bought and sold separately from the physical electricity, allowing entities to claim renewable‑energy use. Application: utilities purchase RECs to meet RPS compliance obligations. Challenges: ensuring additionality, preventing double counting, and establishing robust tracking systems.
Smart Meter – Related terms #
AMI, data analytics, real‑time pricing, consumer engagement. Smart meters record electricity consumption at frequent intervals and transmit data to utilities, enabling dynamic pricing and detailed usage insights. A household with a smart meter can receive alerts when usage spikes, encouraging load‑shifting. Application: utilities deploying smart meters to facilitate demand‑response programs. Challenges: privacy concerns, data security, and the cost of widespread deployment.
Solar Thermal – Related terms #
concentrated solar power, CSP, heat storage, renewable heat. Solar‑thermal technologies capture sunlight to produce heat, which can be used directly for water heating or to drive turbines in CSP plants. Molten‑salt storage in CSP allows electricity generation after sunset, providing firm renewable power. Application: industrial process heat supplied by solar‑thermal collectors, reducing fossil‑fuel consumption. Challenges: high capital cost, water usage for cooling, and land‑area requirements.
Technology Readiness Level (TRL) – Related terms #
innovation pipeline, maturity, R&D, scaling. TRL is a scale from 1 (basic principles observed) to 9 (actual system proven in operational environment) used to assess the maturity of a technology. A battery with TRL 7 has been demonstrated in a relevant environment, indicating near‑commercial readiness. Application: funding agencies allocate resources based on TRL to de‑risk emerging energy technologies. Challenges: accurately gauging readiness across diverse tech domains and avoiding premature commercialization.
Transmission Expansion Planning (TEP) – Related terms #
grid reinforcement, capacity planning, load flow, interconnection. TEP involves evaluating future transmission needs to reliably deliver electricity from generation sites to demand centers, considering factors like load growth, renewable integration, and reliability standards. Scenario analysis may reveal the need for new high‑voltage DC corridors to connect offshore wind farms. Application: regional planning authorities develop investment roadmaps for new transmission corridors. Challenges: land acquisition, permitting delays, and balancing cost with system resilience.
Urban Planning for Energy – Related terms #
zoning, transit‑oriented development, mixed‑use, energy‑efficient design. Integrating energy considerations into urban planning promotes compact, walkable neighborhoods that reduce transportation energy demand and enable efficient district heating. For example, zoning policies that require solar‑ready roofs facilitate rooftop PV adoption. Application: city master plans that set targets for zero‑carbon buildings and electric‑vehicle charging infrastructure. Challenges: coordination among multiple agencies, stakeholder buy‑in, and financing of retrofits.
Water‑Energy Nexus – Related terms #
hydroelectric, cooling water, desalination, resource interdependence. The water‑energy nexus describes the interlinked relationship where energy production consumes water (e.G., Thermal‑plant cooling) and water treatment requires energy (e.G., Pumping). Climate‑induced water scarcity can limit power‑plant output, while renewable technologies like solar PV have low water footprints. Application: shifting from water‑intensive coal plants to dry‑cooling solar farms in arid regions. Challenges: balancing competing demands, forecasting joint resource constraints, and integrating nexus considerations into policy.
Zero‑Carbon Building – Related terms #
net‑zero energy, passive design, renewable integration, building envelope. A zero‑carbon building generates as much renewable energy on‑site as it consumes over a year, resulting in net‑zero operational emissions. Features include high‑performance insulation, triple‑glazed windows, and rooftop PV coupled with battery storage. Application: commercial office towers that achieve LEED Platinum certification by meeting zero‑carbon criteria. Challenges: higher upfront costs, performance verification, and maintaining zero‑carbon status as occupancy patterns change.