Embodied Energy refers to the quantity of energy required to manufacture, and supply to the point of use, a product, material or service. (As an analog of embodied water, embodied energy might also be called "virtual energy", "embedded energy" or "hidden energy"). Traditionally considered, embodied energy is an accounting methodology which aims to find the sum total of the energy necessary - from the raw material extraction, to transport, manufacturing, assembly, installation as well as the capital and other costs of a specific material - to produce a service or product and finally its disassembly, deconstruction and/or decompostion. Different methodologies produce different understandings of the scale and scope of application and the type of energy embodied. Some methodologies are interested in accounting for the energy embodied in terms of oil that support economic processes. Other types of methodologies are concerned to account for the energy embodied in terms of sunlight that support ecological processes. And others like systems ecology are concerned about the support of the ecological-economic process as a whole. Embodied energy as a concept used in systems ecology seeks to measure the "true" energy cost of an item, and has extended this to the concept of "true" value. Methodologies such as emergy have also sought to link embodied energy with fundamental concepts, such as capacitance for example, in physical, electronic and chemical sciences