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Archive:000/Energy storage/EROI: Difference between revisions
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(Created page with "==Overview== EROI = Energy Return On Investment. It's a concept often used for assessing the viability of energy sources such as solar, nuclear, etc. But I believe it also needs to be applied to energy storage. EROI = energy_returned / energy_invested <code>energy_invested</code> should include a few things: * the energy it takes to manufacture or construct the energy storage{{x|preferably including the energy needed to mine the mater...") |
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'''Importance:''' ''The lower the EROI of energy storage, the more [[energy]] we're going to need to replace [[fossil fuels]].'' | |||
==Overview== | ==Overview== | ||
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<code>energy_invested</code> should include a few things: | <code>energy_invested</code> should include a few things: | ||
* the energy it takes to manufacture or construct the energy storage{{x| | * the energy it takes to manufacture or construct the energy storage{{x|This could ''include'' the energy needed to mine the materials. Or not. It's fine either way - but any estimate should ''specify'' whether or not this is included.}} | ||
* the energy used during its operation ('''charging''') | * the energy used during its operation ('''charging''') | ||
* the energy it takes to recycle or dismantle the energy storage at its end-of-life | * the energy it takes to recycle or dismantle the energy storage at its end-of-life | ||
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An <code>EROI = 0.5</code> represents a grand total efficiency of 50%. Over the course of its lifetime, for all its usable stored energy, "only" 2x as much energy ever went into the thing. | An <code>EROI = 0.5</code> represents a grand total efficiency of 50%. Over the course of its lifetime, for all its usable stored energy, "only" 2x as much energy ever went into the thing. | ||
==Table== | ==Table== | ||