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Grey Line (Namma Metro)
The Grey Line is a planned 12.5 km elevated corridor of Namma Metro in Bengaluru, India, running from Hosahalli to Kadabagere with 9 stations, approved in 2024.
Greyhound Lines
Greyhound Lines is an American intercity bus company founded in 1914, the largest long-distance bus carrier in the United States, owned by Flix SE since 2021.
Greystone Mansion
Greystone Mansion, also known as the Doheny Estate, is a 55-room English Revival mansion in Beverly Hills, completed in 1928 and now a public park.
Greywater
Greywater is household wastewater that excludes toilet discharge, typically from baths, showers, and washing machines. It makes up 50–80% of household wastewater and is often recycled for irrigation.
Gribshunden
Gribshunden was the carvel-built flagship of King Hans of Denmark and Norway, constructed in the Netherlands and destroyed by fire and explosion in June 1495 off Ronneby.
Grid computing
Grid computing is a distributed computing model in which organizations securely and coordinately share computing and storage resources on problems no single participant could handle alone.
Grid coupling
A grid coupling is a flexible shaft coupling that transmits torque through a serpentine spring-steel grid seated in slots around two flanged hubs, damping shock and vibration.
Grid Development Plan (Germany)
The Grid Development Plan (Netzentwicklungsplan Strom, NEP) is Germany's national plan for optimizing and expanding its extra-high voltage transmission grid, drawn up by the four transmission system operators.
Grid energy storage
Grid energy storage, also called grid-scale storage, captures electricity produced at one time and returns it to the grid later, using technologies such as pumped hydro and batteries.
Grid fin
A grid fin, also called a lattice fin, is an aerodynamic control surface of small cells used to steer missiles and rockets during atmospheric flight.
Grid frequency
Grid frequency is the rate at which alternating current in a power system oscillates, 60 Hz in North America and 50 Hz in most of the world.
Grid method (experimental mechanics)
The grid method is a full-field optical technique in experimental mechanics that measures in-plane displacement and strain from images of a grid deposited on a deforming specimen.
Grid parity
Grid parity, also called socket parity, is the point at which solar electricity costs the same as or less than grid electricity, marking solar's economic competitiveness.
Grid search
Grid search is an exhaustive hyperparameter tuning method in machine learning: it evaluates every combination of specified parameter values by cross-validation and returns the best-scoring setting.
Grid-following inverter
A grid-following inverter is a power converter that synchronizes to the existing grid voltage and injects current, the dominant control for solar, wind, and battery inverters.
Grid-forming inverter
A grid-forming (GFM) inverter is a power converter that sets its own output voltage and frequency rather than following the grid, supporting stability in solar, wind, and battery plants.
Grid-Interactive Efficient Buildings
A grid-interactive efficient building (GEB) is an energy-efficient building that uses smart controls and on-site resources like solar and storage to adjust electricity use, helping the grid and cutting costs.
GridBeyond
GridBeyond, formerly Endeco Technologies, is a Dublin-headquartered smart energy company founded by Michael Phelan whose AI platform provides demand response, battery storage optimization, and virtual power plant services.
Gridded ion thruster
A gridded ion thruster is an electric propulsion device that accelerates ions through grids, first flown in space in 1964 and used on NASA's Deep Space 1 and Dawn.
Gridfinity
Gridfinity is an open-source modular storage system for 3D printing, created by Zack Freedman in 2022 around a 42 mm grid of baseplates and bins.
Gridiron Energy, LLC
Gridiron Energy, LLC is a Delaware holding company formed in 2017 as an acquisition vehicle for the power firm LS Power, raising $900 million in a single equity placement.
GridPoint
GridPoint is an American clean energy company founded in 2003 and headquartered in Arlington, Virginia, providing energy management and automated demand response software for commercial buildings.
Griff C. Lee
Griff C. Lee is an American civil engineer who helped develop Gulf of Mexico offshore platforms and was elected to the National Academy of Engineering in 1980.
Griffin Mission One
Griffin Mission One (Griffin-1) is a lunar lander mission by Astrobotic under NASA's CLPS, launching to Nobile Crater on a Falcon Heavy no earlier than 2026.
Griffin Romigh
Griffin D. Romigh is an American auditory scientist and electrical engineer at the Air Force Research Laboratory in Ohio, awarded a 2017 PECASE for early-career research.
Griffiths-Jim beamformer
The Griffiths-Jim beamformer, also known as the generalized sidelobe canceler (GSC), is an adaptive beamforming structure introduced by Lloyd J. Griffiths and C.W. Jim in 1982.
Grimeton Radio Station
Grimeton Radio Station, near Varberg in Sweden, is a longwave transmitting station built in 1922–1924 for transatlantic wireless telegraph traffic and a UNESCO World Heritage Site since 2004.
Grimsel Test Site
The Grimsel Test Site is an underground rock laboratory in the Swiss Alps, operated by Nagra since 1984 to research the geological disposal of radioactive waste.
Grimshaw Architects
Grimshaw Architects is an international architecture practice founded in London in 1980 by Sir Nicholas Grimshaw, known for high-tech, structurally expressive buildings such as the Waterloo International Terminal and the Eden Project.
Grinding (abrasive cutting)
Grinding is a machining process that removes material using a bonded abrasive wheel, used where high dimensional accuracy and fine surface finish are needed on hard materials.