Renewable energy in developing countries is an increasingly used alternative to fossil fuel energy, as these countries scale up their energy supplies and address energy poverty. Renewable energy technology was once seen as unaffordable for developing countries.

Geothermal energy is thermal energy extracted from the Earth's crust. It combines energy from the planet's formation and from radioactive decay.

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.

The economy of Bihar has been among the fastest-growing state economies in India in recent years. During the financial year 2025–26, Bihar's gross state domestic product (GSDP) is projected to grow by around 10–12% at current prices.

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.

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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.