A joint initiative undertaken by vehicle designers and steelmakers to create a lighter stronger autobody, improve vehicle fuel efficiency and improve emission performance.

Natural gas occurring alone, not in solution or as free gas with oil or condensate.

Uninterruptible power supply.

Upstream operations deal primarily with the exploration stages of the oil and gas industry, with upstream firms taking the first steps to first locate, test and drill for oil and gas. Later, once reserves are proven, upstream firms will extract any oil and gas from the reserve. Most large oil companies are known as "integrated" because they combine upstream activities with midstream and downstream operations, which take place after the production phase through to the point of sale.

A unitised regenerative fuel cell is a reversible fuel cell which can operate either as a fuel cell,or in reverse like an electrolyser.

Utility or stationary energy storage is the capture of energy produced at one time for use at a later time to reduce imbalances between energy demand and energy production. A device that stores energy is generally called an accumulator or battery. Energy comes in multiple forms including radiation, chemical, gravitational potential, electrical potential, electricity, elevated temperature, latent heat and kinetic. Energy storage involves converting energy from forms that are difficult to store to more conveniently or economically storable forms.