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Property Name Definition
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Description The definition of the term or concept.

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2-M Probe Survey +Probe surveys are used to physically identify and delineate thermal anomalies. A 2-m long hollow steel tube with a tungsten-carbide alloy tip is driven into the ground using a hammer drill. Then a high-precision resistive-temperature device is inserted into the tube. The probe is then left in place for at least one hour.


Accommodation Zone +Accommodation zones occur at fault intersections consisting of belts of interlocking, oppositely dipping normal faults. Multiple subsurface fault intersections in these zones are a favorable host for geothermal activity.
Acoustic Logs +A display of traveltime of acoustic waves versus depth in a well. The term is commonly used as a synonym for a sonic log. Some acoustic logs display velocity.
Acoustic Televiewer +The Acoustic Televiewer (ATV) log provides a very-high resolution, sonic image of the borehole wall. The tool consists of an ultrasonic transducer coupled with a downhole inclinometer. These devices are used to generate an oriented image of seismic velocity variation and wave amplitude. These images are then examined and highlighted to reveal fractures, bedding planes and orientation of those features. The log is useful for strata and fracture delineation, and can also be used to evaluate compressional-wave velocity, borehole deviation and eccentricity.
Active Seismic Techniques +Active seismic techniques study the behavior of artificially-generated elastic waves in the subsurface. A seismic wave or pulse is generated at the surface by an active seismic source which can be a vibration, mechanical impact, or near-surface explosion.
Active Sensors +Sensors that emit their own source of energy then measure the returned/reflected energy signature.
Adaptive Protection +The use of adjustable protective relay settings (e.g., current, voltage, feeders, and equipment) that can change in real time based on signals from local sensors or a central control system. This is particularly useful for feeder transfers and two-way power flow issues associated with high Distributed Energy Resource (DER) penetration.
Adequacy +The ability of the electric system to supply the aggregate electrical demand and energy requirements of the end-use customers at all times, taking into account scheduled and reasonably expected unscheduled outages of system elements.
Adjacent Balancing Authority +A Balancing Authority Area that is interconnected another Balancing Authority Area either directly or via a multi-party agreement or transmission tariff.
Advanced Interrupting Switch +A distribution switch with technologies that can detect and interrupt faults more quickly and precisely. Such a device may rely on advanced fault detection techniques, and may not require full-line reclosing and sectionalizing to isolate faults.
Advanced Metering Infrastructure +A system of smart meters, two-way communications networks, and data management systems implemented to enable metering and other information exchange between utilities and their customers.
Advanced Metering Infrastructure (Ami) / Smart Meters +Electricity meters that use two-way communication to collect electricity usage and related information from customers and to deliver information to customers.
Advanced Transmission Applications +Software that utilizes synchrophasor information for real-time grid operations or planning and off-line analysis. These applications are aimed at providing wide-area situational awareness, grid monitoring, and detailed power system analysis and the improvement or validation of power system models.
Adverse Reliability Impact +The impact of an event that results in frequency-related instability; unplanned tripping of load or generation; or uncontrolled separation or cascading outages that affects a widespread area of the Interconnection.
Aerial Photography +Aerial photography involves taking photos from elevated platforms such as manned or remote controlled aircrafts or helicopters.
Aeromagnetic Survey +Aeromagnetic surveys measure variations in Earth’s magnetic field using high-precision magnetometers (0.1 nanoTesla sensitivity) and are flown using a helicopter, fixed wing, or ultra light aircraft, depending on location and topographic relief.
Air Cooling +Air cooling is commonly defined as rejecting heat from an object by flowing air over the surface of the object, through means of convection. Air cooling requires that the air must be cooler than the object or surface from which it is expected to remove heat. This is due to the second law of thermodynamics, which states that heat will only move spontaneously from a hot reservoir (the heat sink) to a cold reservoir (the air).
Airborne Gravity Survey +Airborne gravity gradiometry (AGG) surveys provide information regarding the mass distribution of the subsurface through the measurement of gravity vector spatial derivatives.
Algae +Photosynthetic, plant-like organisms containing chlorophyll. Often fast growing and able to live in freshwater, seawater, or damp oils. May be unicellular and microscopic or very large, as in the giant kelps. Can be used as a source for biofuels, and has been engineered to produce ethanol, oil and even diesel.
Algae fuel +A specific type of biofuel, made by chemically processing oils from algae.
Alternating current +An electric current that reverses its direction at regularly recurring intervals. In the United States, the standard is 120 reversals or 60 cycles per second. Electricity transmission networks use AC.
Alternative-fuel vehicle +A vehicle designed to operate on an alternative fuel (e.g., compressed natural gas, methane blend, electricity). As defined by the Energy Policy Act, any dedicated, flexible-fuel, or dual-fuel vehicle designed to operate on at least one alternative fuel.
Alternator +A generator producing alternating current by the rotation of its rotor.
Altitude Correction Factor +A multiplier applied to specify distances, which adjusts the distances to account for the change in relative air density (RAD) due to altitude from the RAD used to determine the specified distance. Altitude correction factors apply to both minimum worker approach distances and to minimum vegetation clearance distances.
Alunite +A hydrated aluminum, potassium, sulfate mineral often found around fumaroles
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