A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or tin halide-based material as the light-harvesting active layer. Perovskite materials, such as methylammonium lead halides the all-inorganic cesium lead halide, are…

Solar power has a growing role in electricity production in the United Kingdom, contributing around 6.4% of the UK's annual power generation in 2025. As of 2025, on sunny days, it provides over 30% of the UK's power consumption at times.

A solar cell, also known as a photovoltaic cell (PV cell), is an electronic device that converts the energy of light directly into electricity by using the photovoltaic effect. It is a type of photoelectric cell, a device whose electrical characteristics (such as current, voltage, or resistance) vary when it is…

Corrugated box design is the process of matching design factors for corrugated fiberboard (sometimes called corrugated cardboard) or corrugated plastic boxes with the functional physical, processing and end-use requirements. Packaging engineers work to meet the performance requirements of a box while controlling total…

An electricity meter, electric meter, electrical meter, energy meter, kilowatt-hour meter, or power meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval. Electric utilities use electric meters installed at customers'…

Good Energy Group PLC is a British energy company based in Chippenham, Wiltshire that provides services in the electrification of transport and decentralised renewable energy generation such as domestic solar panels. The company is also an energy retailer, and built a portfolio of wind and solar generation which was…

Gautrain is an 80-kilometre (50-mile) higher-speed express commuter rail system in Gauteng, South Africa, which links Johannesburg, Pretoria, Kempton Park and O. R. Tambo International Airport. It takes 15 minutes to travel from Sandton to O. R. Tambo International Airport on the Gautrain and 35 minutes from Pretoria…

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.

A sustainable food system is a type of food system that provides healthy food to people and creates sustainable environmental, economic, and social systems that surround food. Sustainable food systems start with the development of sustainable agricultural practices, development of more sustainable food distribution…

The System of National Accounts or SNA (until 1993 known as the United Nations System of National Accounts or UNSNA) is an international standard system of concepts and methods for compiling national accounts. The system is nowadays used by almost all countries in the world.