An energy system is a system primarily designed to supply energy-services to end-users. The intent behind energy systems is to minimise energy losses to a negligible level, as well as to ensure the efficient use of energy.

Energy in Bangladesh describes energy and electricity production, consumption and import in Bangladesh. Bangladesh is an emerging economy with a fast-growing energy consumption.

The energy policy of the United Kingdom refers to the United Kingdom's efforts towards reducing energy intensity, reducing energy poverty, and maintaining energy supply reliability. The United Kingdom has had success in this, though energy intensity remains high.

Open energy-system models are energy-system models that are open source. These models can also be known as open energy models or open-source energy-system models or some combination thereof.

Outfox Energy, the trading name of Foxglove Energy Supply Limited, is a British energy supplier based in Leicester, United Kingdom. It was founded in 2017.

Most energy in Israel comes from fossil fuels. The country's total primary energy demand is significantly higher than its total primary energy production, relying heavily on imports to meet its energy needs.

Octopus Energy Group Limited (formerly Octopus Energy Limited and Octopus Energy Holdings Limited), known as Octopus Energy, is a British company operating in the fields of energy generation and supply. It was founded in 2015 with the backing of Octopus Group, a British asset management company.

Great British Energy (GB Energy, GBE) is a publicly owned energy investment company in the United Kingdom. It was established by the Great British Energy Act 2025, which received royal assent on 15 May 2025, and is sponsored by the Department for Energy Security and Net Zero.

Energy in Kazakhstan describes energy and electricity production, consumption and import in Kazakhstan and the politics of Kazakhstan related to energy. Kazakhstan, which has oil, gas, coal and uranium reserves, is a net energy exporter and a leading energy producer in the Commonwealth of Independent States (CIS).

Energy in Jordan describes energy and electricity production, consumption and import in Jordan. Jordan is among the highest in the world in dependency on foreign energy sources, with 92.3% of the country's energy supply being imported.