Emergy
Emergy is defined as the quantity of solar energy used directly or indirectly to obtain a product by a given process or to renew a resource that has been consumed (Odum, 1971a,b; Odum, 1996).
From: Developments in Environmental Modelling, 2014
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/emergy
Originally H.T. Odum used the term embodied energy, but he transitioned to the term EMergy, as a short form of Energy Memory.
”Emergy is the available energy of one kind previously used up directly and indirectly to make a product or service. The energy required for the transformations is no longer in the product or service, but energy carries the memory of the availability that was used up. Emergy is a new kind of state variable. The units of energy are defined with the prefix em- (e.g., emcalories, emjoules, emBtus)” (Odum, 2007, p. 69).
https://www.resilience.org/stories/2013-01-21/emergy-you-spelled-energy-wrong/