Affluent Savvy
Affluent Savvy
Photo: Eduardo Romero
Energy from primary energy sources almost always transformed into different forms to make it easier to use, transport, or store. These forms are called energy currencies. Several authors have introduced the idea of energy currency as a way to think about these useful intermediate forms of energy.
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Learn More »Energy from primary energy sources almost always transformed into different forms to make it easier to use, transport, or store. These forms are called energy currencies. Several authors have introduced the idea of energy currency as a way to think about these useful intermediate forms of energy.[1] Humans harvest primary energy from nature and eventually turn this energy into an energy service. Primary energy sources include primary energy flows (like solar power) and primary fuels (like raw natural gas). The energy service is what maintains a high energy society (through heating, transportation, etc.). These intermediate forms, energy currencies, are used because they are flexible and transportable energy, which allows moving the energy supply almost anywhere.[1] For example, while it's nice to enjoy sunlight, it doesn't recharge the battery in a cell phone; some energy conversion technology is required to get it into the specific form (and then moved with energy distribution technology, like pipelines or the electrical grid). The form that holds that energy from the energy conversion technology is sometimes referred to as an energy currency. There is always some energy loss when making an energy currency, often due to the second law of thermodynamics. [2] Without the currency stage, the primary energy wouldn't be able to be turned into the energy service. Figure 1. A diagram of how energy makes its way from the sun into the energy services used everyday. Energy currencies like electricity and gasoline are a critical step.Without the currency stage, the primary energy wouldn't be able to be turned into the energy service. Electricity, consumer natural gas and gasoline are the most relevant energy currencies, and are derived from primary energy. These energy currencies are easier to turn into useful work than most primary energy is. For example, a lump of coal can be burned for lighting a house, but it’s much cleaner (at least for the living room) to burn that lump of coal in a power plant and send the electricity through the grid to the house. Energy currencies are flexible; they can be used for many energy services. For example, electricity is far more flexible than wind power. When an electric kettle boils water, the water boils no differently whether the electricity came from coal, nuclear, biomass, wind, or hydro. The electricity could have also been used to play a computer game. See more in the article electricity as an energy currency. This flexibility of use means that, in general, the amount of energy currency that the world uses is growing faster than primary energy use is. In other words, the percentage of energy use that goes to electricity is rising (electricity use is rising faster than energy use). Worldwide, more and more energy is being turned into energy currencies because of how useful they are. Visit the article on trends in energy currencies for more information.
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