901 articles
Gujarat State Electricity Corporation
Gujarat State Electricity Corporation is a state-owned power generation company in Gujarat, India, incorporated in 1993 under the Gujarat Electricity Board and now GUVNL's generation arm, with 7,250 MW installed capacity.
Gujarat Urja Vikas Nigam
Gujarat Urja Vikas Nigam (GUVNL) is an Indian state government company, created in 2005, that buys bulk power and coordinates Gujarat's electricity sector through its subsidiaries.
Guoyue Investment Group
Guoyue Investment Group Co., Ltd. (国粤投资集团有限公司) is a Chinese private investment group headquartered in Shenzhen, whose operating core is coal-fired power generation in southern China.
Hao Huang (electrical engineer)
Hao Huang is an electrical power engineer and Distinguished Adjunct Professor at the University of Houston, elected to the National Academy of Engineering in 2021 for aerospace electrical systems work.
Harmonic filter
A harmonic filter is electrical equipment that reduces harmonic distortion in power systems by diverting or canceling harmonic currents from nonlinear loads such as variable frequency drives, rectifiers, and arc furnaces.
Harmonic resonance
Harmonic resonance in power systems occurs when the system's natural frequency, set by inductance and capacitor banks, matches a harmonic source like a variable-frequency drive, amplifying harmonic voltages far above normal levels and damaging equipment.
Harmonic restraint
Harmonic restraint is a technique in transformer differential protection that uses the harmonic content of inrush current, especially the second harmonic, to prevent relay tripping.
Harmonics (electrical power)
Power system harmonics are voltage or current components at integer multiples of the 50 or 60 Hz fundamental, produced by non-linear loads and measured as total harmonic distortion (THD).
Harold N. Scherer Jr.
Harold N. Scherer Jr. (1929–2017) was an American electric power engineer who led the design and energization of the first 765-kV transmission line, then the world's highest voltage.
Harry O. Monson
Harry O. Monson was an American engineer at Argonne National Laboratory and National Academy of Engineering member known for the Experimental Breeder Reactor II program.
Haryana Power Generation
Haryana Power Generation Corporation Limited (HPGCL) is the wholly state-owned generation company of Haryana, India, incorporated in 1997 and operating thermal, hydro, and solar plants totaling 2,582.4 MW.
Hawaiian Electric Industries
Hawaiian Electric Industries (HEI) is a Hawaii holding company, dating to 1891, whose main utility subsidiary supplies electricity to about 95 percent of Hawaii's residents.
Hayes substation fire
The Hayes substation fire broke out on 20 March 2025 at the North Hyde substation in Hayes, west London, cutting power to over 70,000 customers and closing Heathrow Airport.
Hebei Construction & Investment Group
Hebei Construction & Investment Group, known abroad as HECIG, is a Chinese state-owned investment holding company wholly owned by Hebei province's SASAC and the province's largest state-owned capital investment company.
Hebei Construction Investment Energy Investment
Hebei Construction Investment Energy Investment (Jiantou Energy) is a Chinese state-owned power company investing in and operating coal-fired generation and district heating in Hebei Province.
Henan Shenhuo Coal&Power
Henan Shenhuo Coal & Power (河南神火煤电) is a Chinese coal mining, power, and aluminum smelting company, listed in Shenzhen and headquartered in Yongcheng, Henan Province.
Henan Yuneng Holdings
Henan Yuneng Holdings is a provincial state-owned energy company in Zhengzhou, Henan, that generates and sells electricity and heat from coal-fired plants and is expanding into wind and solar.
Hera Group
Hera Group (Gruppo Hera) is an Italian multi-utility headquartered in Bologna, providing water, gas, electricity, waste management, and related services mainly in Emilia-Romagna. It was formed in 2002 from 11 municipal utilities.
High-frequency transformer
A high-frequency transformer transfers power at frequencies far above the 50 or 60 Hz grid, typically tens of kilohertz, providing galvanic isolation in switched-mode power supplies, DC-DC converters, and solid-state transformers.
High-voltage direct current
High-voltage direct current (HVDC), also called high-voltage DC, transmits electrical power as direct current at high voltage, used for long-distance bulk transmission, submarine cables, and connecting unsynchronized AC grids.
Hilliard W. Paige
Hilliard W. Paige, also known as Hilliard Wegner Paige, was an American engineer and executive elected to the National Academy of Engineering in 1968 who led General Electric's missile and space division.
HK Electric Investments
HK Electric Investments is a Hong Kong-listed investment trust holding The Hongkong Electric Company, the utility supplying electricity to Hong Kong Island, Ap Lei Chau, and Lamma.
Hokkaido Electric Power
Hokkaido Electric Power, also known as Hokkaido Denryoku or HEPCO, is the electric utility serving all of Hokkaido, Japan's northern main island. It was founded in 1951 and is headquartered in Sapporo.
Hokuriku Electric Power
Hokuriku Electric Power (北陸電力) is a Japanese electric utility, established in 1951, serving Toyama, Ishikawa, and Fukui prefectures from its head office in Toyama City.
Hoosier Energy Rural Electric Cooperative
Hoosier Energy Rural Electric Cooperative is a not-for-profit generation and transmission electric cooperative headquartered in Bloomington, Indiana, founded by farmers in 1949 to provide affordable wholesale power to 17 member cooperatives serving more than 700,000 consumers.
Hrvatska elektroprivreda
Hrvatska elektroprivreda (HEP) is the Croatian state-owned electric power company established on 28 July 1990, which generates, transmits, and distributes electricity, supplies heat and gas, and co-owns the Krško nuclear plant in Slovenia.
Huadian Energy
Huadian Energy (华电能源) is a Chinese power generation and district heating company headquartered in Harbin, Heilongjiang. Controlled by China Huadian Group, it is the province's largest thermal power generator.
Huaihe Energy Holding Group
Huaihe Energy Holding Group (淮河能源) is a Chinese state-owned energy group based in Huainan, Anhui Province, whose main businesses are coal, electricity, and gas; it controls Huainan Mining and the Shanghai-listed Huaihe Energy (Group) Co.
Hubei Energy Group
Hubei Energy Group, formed in 2005 and listed on the Shenzhen Stock Exchange, is a Chinese state-owned energy company in Wuhan controlled by China Three Gorges Corporation.
Hybrid HVDC breaker
A hybrid HVDC breaker is a high-voltage direct current circuit breaker combining a mechanical switch with power electronics to clear DC faults in milliseconds with low losses.