Energy Data Analysis and Modeling
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.
Absorptance #
Absorptance
The proportion of incident solar radiation that a surface actually absorbs, expr… #
It directly affects heating loads in building simulations and solar‑thermal system sizing. Related terms: emissivity, reflectance, transmissivity. *Example*: A south‑facing wall with an absorptance of 0.7 Will capture more heat than one with 0.3, Influencing HVAC design. *Practical application*: Used in daylighting analysis to estimate indoor temperature rise. *Challenges*: Accurate measurement requires spectroradiometers; seasonal variation can complicate static assumptions.
Aggregated Load Profile #
Aggregated Load Profile
A composite representation of electricity demand obtained by summing individual… #
Helps planners assess system‑wide peak demand and inform capacity procurement. Related terms: load curve, demand aggregation, time‑series clustering. *Example*: Combining residential, commercial, and industrial load profiles to produce a city‑wide hourly demand series. *Practical application*: Basis for generation scheduling and demand‑side management program design. *Challenges*: Data privacy, heterogeneity of data sources, and aligning timestamps across datasets.
Albedo #
Albedo
The ratio of reflected solar radiation to incident radiation on a surface, rangi… #
Influences surface temperature and local microclimate. Related terms: absorptance, reflectance, surface roughness. *Example*: Fresh snow has an albedo of 0.85, Markedly reducing heat absorption compared with asphalt (≈0.07). *Practical application*: Urban planners use albedo values to model heat island mitigation strategies. *Challenges*: Seasonal changes and surface aging modify albedo, requiring periodic re‑measurement.
Allocation Factor #
Allocation Factor
A coefficient used to distribute aggregate energy consumption or emissions among… #
G., Departments, processes) based on a chosen metric such as floor area or production volume. Related terms: attribution, apportionment, energy intensity. *Example*: Allocating a plant’s total electricity use to each production line proportionally to its output tonnage. *Practical application*: Enables cost‑center reporting and targeted efficiency interventions. *Challenges*: Selecting an appropriate basis that reflects true causality and avoids distortions.
Ambient Temperature #
Ambient Temperature
The surrounding air temperature measured at a standard height (typically 2 m abo… #
Related terms: dry‑bulb temperature, temperature setpoint, thermal comfort. *Example*: HVAC cooling load calculations increase as ambient temperature rises above the design setpoint. *Practical application*: Used in degree‑day analysis for heating and cooling load forecasting. *Challenges*: Spatial variability in large regions and microclimate effects can lead to inaccurate estimates if a single station is used.
Annual Energy Consumption (AEC) #
Annual Energy Consumption (AEC)
The total amount of energy (electricity, gas, fuel) used by a system or facility… #
Related terms: energy intensity, demand profile, baseline consumption. *Example*: A medium‑size office building reports an AEC of 1.2 GWh for electricity. *Practical application*: Benchmarking against industry averages to identify improvement potential. *Challenges*: Metering gaps, missing data, and seasonal anomalies can skew the true consumption figure.
ARIMA Model (AutoRegressive Integrated Moving Average) #
ARIMA Model (AutoRegressive Integrated Moving Average)
A statistical technique for forecasting time‑series data by combining autoregres… #
Widely applied to electricity demand and price prediction. Related terms: Box‑Jenkins methodology, seasonal ARIMA (SARIMA), time‑series decomposition. *Example*: An ARIMA(2,1,1) model forecasts daily peak load based on historical demand. *Practical application*: Short‑term load forecasting for unit commitment in power markets. *Challenges*: Model selection is data‑intensive; non‑stationarity and external regressors (e.G., Weather) may require advanced extensions.
Asset Register #
Asset Register
A comprehensive inventory of physical assets (generation units, transformers, me… #
Serves as the foundation for reliability analysis and investment planning. Related terms: asset management, lifecycle costing, condition monitoring. *Example*: The register lists a 500 MW gas turbine installed in 2010 with a remaining useful life of 15 years. *Practical application*: Enables prioritization of maintenance and replacement schedules. *Challenges*: Keeping data current, reconciling multiple data sources, and integrating GIS information.
Balancing Authority (BA) #
Balancing Authority (BA)
An entity responsible for maintaining real‑time equilibrium between electricity… #
Related terms: system operator, control area, ancillary services. *Example*: The regional transmission organization (RTO) acts as the BA for its footprint, issuing dispatch orders every five minutes. *Practical application*: Ensures grid stability and prevents frequency deviations. *Challenges*: Integrating intermittent renewables and handling cross‑border power flows.
Base Load #
Base Load
The minimum level of continuous electricity demand that must be met by dispatcha… #
Related terms: peak load, load curve, dispatchable generation. *Example*: A utility’s base load of 3 GW is served by two coal units operating at near‑full capacity. *Practical application*: Guides capacity planning and informs decisions on retiring or retrofitting plants. *Challenges*: Declining baseload due to higher renewable penetration and the need for flexible ramping resources.
Benchmarking #
Benchmarking
The process of comparing a facility’s energy performance against a reference set… #
Related terms: energy index, best‑practice, performance gap. *Example*: An office building’s Energy Use Intensity (EUI) is 120 kWh/m²·yr, higher than the national average of 95 kWh/m²·yr. *Practical application*: Drives targeted retrofits and informs policy incentives. *Challenges*: Selecting appropriate comparators, accounting for climate differences, and ensuring data quality.
Capacity Factor #
Capacity Factor
The ratio of actual energy produced by a plant over a period to the maximum poss… #
Expressed as a percentage. Related terms: capacity utilization, availability factor, performance ratio. *Example*: A 100 MW wind farm generating 262 GWh in a year has a capacity factor of 30 %. *Practical application*: Used to evaluate economic feasibility and compare technologies. *Challenges*: Variability of resource (wind, solar) and downtime for maintenance affect the metric.
Cascading Failure #
Cascading Failure
A sequence of outages in a power system where the loss of one component overload… #
Modeling such events helps improve system resilience. Related terms: blackout, system reliability, contingency analysis. *Example*: The 2003 North American blackout began with a line trip that propagated across multiple operators. *Practical application*: Stress‑testing grid models to identify critical nodes. *Challenges*: Capturing complex interdependencies and real‑time operator actions in simulations.
Circular Economy #
Circular Economy
An economic model that emphasizes resource reuse, recycling, and waste minimizat… #
Related terms: life‑cycle assessment, resource efficiency, waste‑to‑energy. *Example*: Recovering heat from industrial exhaust for district heating reduces primary energy demand. *Practical application*: Supports policy development for energy‑efficient product design. *Challenges*: Integrating disparate supply chains and quantifying indirect energy savings.
Coefficient of Performance (COP) #
Coefficient of Performance (COP)
The ratio of useful heating or cooling output to the electrical energy input for… #
Higher COP indicates greater efficiency. Related terms: energy efficiency ratio (EER), seasonal COP, performance ratio. *Example*: A heat pump with a COP of 3.5 Delivers 3.5 KWh of heat for each kWh of electricity consumed. *Practical application*: Sizing HVAC equipment and calculating operational cost savings. *Challenges*: COP varies with outdoor temperature; proper modeling requires climate‑dependent data.
CO₂ Emissions Factor #
CO₂ Emissions Factor
A coefficient that converts energy consumption (e #
G., KWh of electricity) into an estimate of carbon dioxide emissions, based on the fuel mix of the generating grid. Related terms: carbon intensity, greenhouse gas accounting, emission inventory. *Example*: An electricity emissions factor of 0.45 Kg CO₂/kWh indicates that each kilowatt‑hour consumed generates 0.45 Kg of CO₂. *Practical application*: Used in corporate carbon reporting and policy impact assessments. *Challenges*: Temporal variability of the generation mix and regional differences require high‑resolution data.
Demand Response (DR) #
Demand Response (DR)
Programs that incentivize electricity consumers to modify their usage patterns i… #
Related terms: load shifting, price elasticity, ancillary services. *Example*: A commercial building reduces its HVAC load by 15 % during a peak‑price event, receiving a rebate. *Practical application*: Provides fast‑acting capacity to mitigate renewable intermittency. *Challenges*: Ensuring reliable participant response and integrating DR signals with building automation systems.
Distributed Generation (DG) #
Distributed Generation (DG)
Small‑scale electricity generation technologies (solar PV, micro‑turbines, fuel… #
Related terms: behind‑the‑meter, net metering, prosumer. *Example*: A residential rooftop solar system of 5 kW feeds excess power back to the grid under a net‑metering arrangement. *Practical application*: Reduces transmission losses and supports grid decarbonization. *Challenges*: Managing voltage regulation, two‑way power flows, and fair compensation mechanisms.
Energy Intensity #
Energy Intensity
A measure of the amount of energy used per unit of economic output, service, or… #
Related terms: energy efficiency, specific consumption, performance indicator. *Example*: A manufacturing plant’s energy intensity of 0.8 GJ/ton indicates the energy required to produce one tonne of product. *Practical application*: Tracks progress toward national energy‑saving targets. *Challenges*: Adjusting for changes in production mix and accounting for rebound effects.
Energy Management System (EMS) #
Energy Management System (EMS)
A suite of hardware and software tools that monitor, control, and optimize the g… #
Related terms: SCADA, building automation, demand‑side management. *Example*: An EMS aggregates real‑time meter data to automatically curtail non‑critical loads during peak periods. *Practical application*: Enables data‑driven decision making and supports compliance with energy‑performance standards. *Challenges*: Interoperability with legacy equipment and ensuring cybersecurity.
Energy Modeling #
Energy Modeling
The quantitative representation of energy flows, conversion processes, and econo… #
Related terms: system dynamics, optimization, scenario analysis. *Example*: A bottom‑up model simulates residential heating demand based on weather, building envelope, and appliance stock. *Practical application*: Informs policy design, investment appraisal, and technology road‑mapping. *Challenges*: Data scarcity, model complexity, and uncertainty propagation.
Energy Portfolio #
Energy Portfolio
A collection of diverse energy assets (generation, storage, demand‑side resource… #
Related terms: asset mix, portfolio optimization, risk management. *Example*: A utility’s portfolio includes 40 % coal, 30 % wind, 20 % solar, and 10 % battery storage. *Practical application*: Guides strategic decisions on new capacity investments and de‑carbonization pathways. *Challenges*: Balancing competing goals, forecasting market dynamics, and integrating policy constraints.
Energy Storage #
Energy Storage
Technologies that capture energy for later use, ranging from batteries and pumpe… #
Related terms: capacity, round‑trip efficiency, storage duration. *Example*: A 50 MWh lithium‑ion battery provides frequency regulation services by rapidly injecting or absorbing power. *Practical application*: Mitigates renewable variability and defers transmission upgrades. *Challenges*: High capital cost, degradation over cycles, and regulatory frameworks for market participation.
Energy Transition #
Energy Transition
The long‑term shift from fossil‑based energy systems toward low‑carbon, renewabl… #
Related terms: decarbonization, energy mix, pathway analysis. *Example*: A national plan targets 70 % renewable electricity by 2035, phasing out coal generation. *Practical application*: Shapes investment priorities, grid planning, and emissions regulations. *Challenges*: Managing stranded assets, ensuring supply security, and addressing social equity concerns.
Energy Use Intensity (EUI) #
Energy Use Intensity (EUI)
A specific form of energy intensity that expresses total energy consumption per… #
Related terms: building performance, benchmarking, retrofit potential. *Example*: An office building with an EUI of 150 kWh/m²·yr exceeds the target of 120 kWh/m²·yr set by local standards. *Practical application*: Facilitates comparison across building types and informs retrofitting decisions. *Challenges*: Variations in occupancy schedules and equipment mixes can obscure true performance.
Forecasting Horizon #
Forecasting Horizon
The time span over which a prediction is made, ranging from minutes (short‑term… #
Choice of horizon influences model selection and data requirements. Related terms: prediction interval, temporal resolution, scenario planning. *Example*: A 24‑hour forecasting horizon is used for day‑ahead market bidding. *Practical application*: Aligns analytical outputs with operational or strategic decision cycles. *Challenges*: Uncertainty grows with horizon length, and different horizons may require distinct modeling approaches.
Grid Parity #
Grid Parity
The point at which the levelized cost of electricity (LCOE) from a renewable tec… #
Related terms: levelized cost, market price, cost‑competitiveness. *Example*: Solar PV achieved grid parity in Region X when its LCOE dropped to $0.08/KWh, matching the wholesale price. *Practical application*: Signals investors to increase renewable capacity deployment. *Challenges*: Variability in regional tariffs, policy support, and ancillary cost inclusion.
Heat Rate #
Heat Rate
The amount of thermal energy (usually in British thermal units, Btu) required to… #
Related terms: thermal efficiency, specific fuel consumption, plant performance. *Example*: A coal plant with a heat rate of 10,000 Btu/kWh has an efficiency of about 34 %. *Practical application*: Used in cost modeling to estimate fuel expenses for generation units. *Challenges*: Heat rate varies with load, fuel quality, and equipment aging.
Levelized Cost of Energy (LCOE) #
Levelized Cost of Energy (LCOE)
A metric that aggregates all costs (capital, operation, fuel, financing) over a… #
Related terms: discounted cash flow, net present value, cost‑benefit analysis. *Example*: A wind farm with an LCOE of $0.06/KWh is cheaper than the regional average wholesale price of $0.09/KWh. *Practical application*: Allows apples‑to‑apples comparison of disparate generation technologies. *Challenges*: Sensitivity to discount rate, capacity factor assumptions, and future policy changes.
Load Curve #
Load Curve
A graphical or tabular representation of electricity demand over a specified per… #
It reveals patterns such as daily peaks, valleys, and seasonal trends. Related terms: demand profile, time‑series, load duration curve. *Example*: The residential load curve peaks at 7 pm due to cooking and space‑heating activities. *Practical application*: Guides generation dispatch, demand‑side program design, and infrastructure sizing. *Challenges*: Data gaps, outlier events, and changing consumer behavior can distort the curve.
Load Duration Curve (LDC) #
Load Duration Curve (LDC)
A sorted version of the load curve that plots demand values against the percenta… #
Related terms: capacity factor, load curve, reliability planning. *Example*: An LDC shows that a 200 MW plant is needed to meet demand for 5 % of the year (peak load). *Practical application*: Assists in determining optimal generation mix and reserve margins. *Challenges*: Does not convey temporal sequencing of loads; must be complemented with chronological simulation.
Marginal Cost #
Marginal Cost
The incremental cost of producing one additional unit of electricity, typically… #
It drives economic dispatch in wholesale markets. Related terms: variable cost, supply curve, price formation. *Example*: The marginal cost of a natural‑gas peaker plant might be $40/MWh, reflecting fuel price and heat rate. *Practical application*: Determines which units are dispatched first in merit‑order markets. *Challenges*: Ignoring externalities (e.G., Emissions) can lead to sub‑optimal environmental outcomes.
Net Metering #
Net Metering
A billing arrangement that credits customers for excess electricity exported to… #
Related terms: feed‑in tariff, self‑consumption, prosumer. *Example*: A homeowner with a 4 kW PV system exports 200 kWh in a month and receives a credit equal to that amount. *Practical application*: Encourages distributed generation adoption and reduces net demand on the grid. *Challenges*: Policy design must balance utility revenue sustainability and fair compensation.
Peak Shaving #
Peak Shaving
The practice of reducing electricity demand during peak periods, often using on‑… #
Related terms: demand response, load shifting, capacity reduction. *Example*: A manufacturing facility discharges a battery during a 4 pm‑6 pm peak window, cutting its demand by 2 MW. *Practical application*: Improves cost efficiency and supports grid reliability. *Challenges*: Ensuring sufficient storage capacity and coordinating with utility demand‑response programs.
Power Purchase Agreement (PPA) #
Power Purchase Agreement (PPA)
A long‑term contract between an electricity buyer (often a utility or corporate… #
Related terms: off‑take agreement, contract for differences, renewable procurement. *Example*: A tech company signs a 15‑year PPA to purchase 100 MW of wind power at a fixed price of $0.05/KWh. *Practical application*: Provides revenue certainty for project developers and price stability for buyers. *Challenges*: Negotiating appropriate escalation clauses and aligning with regulatory frameworks.
Renewable Energy Certificate (REC) #
Renewable Energy Certificate (REC)
A tradable instrument that represents the environmental attributes of one megawa… #
Related terms: green tag, carbon credit, tracking system. *Example*: A solar farm issues 10,000 RECs annually, which a utility can purchase to meet its 20 % renewable target. *Practical application*: Enables flexible compliance and incentivizes renewable development. *Challenges*: Avoiding double counting and ensuring robust verification mechanisms.
Solar Irradiance #
Solar Irradiance
The power per unit area received from the Sun’s radiation at a given location, u… #
It is the primary driver of photovoltaic and solar‑thermal system performance. Related terms: insolation, global horizontal irradiance, clearness index. *Example*: A site with a solar irradiance of 800 W/m² at noon is suitable for high‑efficiency PV installation. *Practical application*: Input for sizing solar arrays and estimating energy yield. *Challenges*: Temporal variability, cloud cover, and shading effects complicate accurate modeling.
Time‑of‑Use (TOU) Pricing #
Time‑of‑Use (TOU) Pricing
A rate structure where electricity prices vary according to the time of day, ref… #
Related terms: dynamic pricing, peak‑off‑peak, tariff design. *Example*: A utility charges $0.20/KWh during peak hours (3 pm‑8 pm) and $0.10/KWh during off‑peak. *Practical application*: Encourages consumers to shift load, supporting grid flexibility. *Challenges*: Requires advanced metering infrastructure and clear communication to users.
Transmission Losses #
Transmission Losses
The portion of electrical energy lost as heat due to resistance and reactive eff… #
Related terms: line resistance, reactive power, distribution losses. *Example*: A transmission line with a 3 % loss means that 3 % of generated power dissipates before reaching customers. *Practical application*: Influences optimal siting of generation and the economic case for high‑voltage direct current (HVDC) links. *Challenges*: Accurate loss estimation requires detailed network modeling and load flow analysis.
Variable Renewable Energy (VRE) #
Variable Renewable Energy (VRE)
Renewable generation sources such as wind and solar whose output fluctuates with… #
Related terms: intermittency, capacity factor, forecasting. *Example*: A 200 MW wind farm may produce between 0 MW and 180 MW depending on wind speed. *Practical application*: Drives the need for flexible generation, storage, and demand‑response resources. *Challenges*: Forecast error, ramping needs, and grid stability concerns.
Voltage Regulation #
Voltage Regulation
The process of maintaining voltage levels within prescribed limits across the di… #
Related terms: reactive power support, voltage sag, power quality. *Example*: A distribution transformer equipped with an on‑load tap changer adjusts voltage to keep it at 230 V ±5 %. *Practical application*: Ensures equipment longevity and compliance with standards. *Challenges*: Increasing penetration of inverter‑based resources can alter traditional voltage control dynamics.
Weighted Average Cost of Capital (WACC) #
Weighted Average Cost of Capital (WACC)
A blended rate that reflects the cost of financing a project, combining the cost… #
Used in discounted cash‑flow analyses for energy projects. Related terms: discount rate, cost of equity, cost of debt. *Example*: A solar project with 70 % equity at 8 % and 30 % debt at 5 % yields a WACC of 7.1 %. *Practical application*: Determines the net present value and investment viability of energy assets. *Challenges*: Estimating appropriate risk premiums and accounting for policy incentives.
Yield Curve (Energy) #
Yield Curve (Energy)
A graphical representation of expected electricity generation (or revenue) over… #
Related terms: production profile, revenue stream, financial modeling. *Example*: A wind farm’s yield curve shows higher generation in the first decade due to favorable wind patterns, tapering slightly as turbine performance degrades. *Practical application*: Supports loan underwriting and investor confidence. *Challenges*: Long‑term meteorological uncertainty and equipment degradation must be modeled accurately.
Zero‑Emission Vehicle (ZEV) #
Zero‑Emission Vehicle (ZEV)
A vehicle that emits no tailpipe pollutants, typically powered by electricity or… #
Related terms: electric vehicle (EV), fuel‑cell vehicle, decarbonization. *Example*: An electric bus with a 300 kWh battery draws energy from the grid, producing zero local emissions. *Practical application*: Influences electricity demand forecasts and charging infrastructure planning. *Challenges*: Grid capacity for fast charging, battery lifecycle impacts, and policy incentives alignment.