Co-op Energy is a membership-owned British energy supply company based in Warwick that began trading in 2010. It sells renewable electricity (some from community-owned sources) and gas to its ethically concerned member owner/customers and is an established large operator, an alternative to the Big Six energy suppliers.

A geyser (, UK: ) is a spring with an intermittent water discharge ejected turbulently and accompanied by steam. The formation of geysers is fairly rare and is caused by particular hydrogeological conditions that exist only in a few places on Earth.

EDF Energy is a British integrated energy company, wholly owned by the French state-owned EDF (Électricité de France), with operations spanning electricity generation and the sale of natural gas and electricity to homes and businesses throughout the United Kingdom. It employs 11,717 people, and handles 5.22 million…

Berkshire Hathaway Energy (BHE) is an American energy holding company and a wholly owned subsidiary of Berkshire Hathaway. The company is headquartered in Des Moines, Iowa.

Ophir Energy plc was an oil and gas exploration and production company based in London. It owned both operating and non-operating assets in Africa, Asia, and Mexico.

Martian geysers (or CO2 jets) are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw. "Dark dune spots" and "spiders" – or araneiforms – are the two most visible types of features ascribed to these eruptions.

Energy in Greece is dominated by fossil gas and oil. Electricity generation is dominated by the one third state owned Public Power Corporation (known mostly by its acronym ΔΕΗ, or in English DEI).

Bristol Energy was a municipally owned energy supply company, founded in September 2015 by Bristol City Council. Its business accounts were sold to Yü Energy in August 2020, and in the following month its residential accounts were sold to Together Energy.

Emerald Energy plc is an energy exploration subsidiary of Chinese state-owned company Sinochem with headquarters in London but is registered offshore in the Isle of Man. The company specialises in oil exploration and production of hydrocarbons.

Solid Energy was the largest coal mining company in New Zealand and is a state owned enterprise of the New Zealand Government. The company was formed from the former government department State Coal Mines.