• investment (EROI), also sometimes called energy returned on energy invested (ERoEI), is the ratio of the amount of usable energy (the exergy) delivered from...
    43 KB (4,268 words) - 15:40, 23 May 2025
  • Thumbnail for Embodied energy
    be multiplied by 1 EROEI-1 {\displaystyle {\frac {\hbox{1}}{\hbox{EROEI-1}}}} in order to get the embodied energy. Given an EROEI of eight, for example...
    31 KB (3,147 words) - 16:44, 9 June 2025
  • processing, a ratio known as "Energy Returned on Energy Invested" (EROEI). An EROEI of 2 (or 2:1 ratio) would mean that to produce 2 barrels of actual...
    32 KB (3,408 words) - 00:58, 4 June 2025
  • Elsevier under its "North Holland" imprint Energy returned on energy invested (EROEI), ratio of the amount of usable energy acquired from a particular energy...
    2 KB (241 words) - 13:03, 28 July 2021
  • and intelligent energy management. Energy returned on energy invested (EROEI) is the ratio of energy delivered by an energy technology to the energy...
    5 KB (444 words) - 20:38, 10 October 2024
  • Thumbnail for Learning curve
    efforts. The most studied of these may be Energy Return on Energy Invested or EROEI, discussed at length in an Encyclopedia of the Earth article and in an OilDrum...
    36 KB (4,349 words) - 09:15, 18 June 2025
  • processes, the EROEI for oil shale is below the EROEI of about 20:1 for conventional oil extraction at the wellhead. A 1984 study estimated the EROEI of the different...
    28 KB (3,286 words) - 01:53, 17 January 2025
  • Thumbnail for The Coal Question
    limits to growth, overpopulation, overshoot, energy return on energy input (EROEI), taxation of energy resources, renewable energy alternatives, and resource...
    21 KB (2,817 words) - 21:15, 13 February 2025
  • Thumbnail for Hubbert peak theory
    referred to as the Energy Return on Energy Investment (EROI or EROEI). Should the EROEI drops to one, or equivalently the Net energy gain falls to zero...
    52 KB (6,193 words) - 01:08, 6 July 2025
  • Thumbnail for Shale oil extraction
    and processing (Energy Returned on Energy Invested, or EROEI). A 1984 study estimated the EROEI of the various known oil shale deposits as varying between...
    91 KB (8,775 words) - 01:59, 6 July 2025
  • accounting Energy & Environment Energy balance Energy policy Energy subsidy EROEI Industrial ecology International Energy Agency List of energy storage projects...
    17 KB (1,695 words) - 22:15, 30 June 2025
  • modern statistics to show that marginal returns on investments in energy (EROEI), education and technological innovation are diminishing today. The globalised...
    12 KB (1,413 words) - 20:03, 21 February 2025
  • Thumbnail for Sustainability measurement
    EROEI). Currently, between one and five barrels of oil are recovered for each barrel-equivalent of energy used in the recovery process. As the EROEI drops...
    56 KB (5,821 words) - 02:06, 6 July 2025
  • Thumbnail for World energy supply and consumption
    producers to be economical the ratio of energy returned on energy invested (EROEI) or energy return on investment (EROI) should be large enough. If the final...
    37 KB (3,711 words) - 03:49, 22 April 2025
  • Thumbnail for Ecological economics
    order to produce energy. To be useful the energy return on energy invested (EROEI) has to be greater than one. The net energy gain from the production of...
    80 KB (9,248 words) - 01:49, 25 May 2025
  • Thumbnail for Oil shale industry
    a ratio known as "Energy Returned on Energy Invested" (EROEI). A 1984 study estimated the EROEI of the various known oil-shale deposits as varying between...
    43 KB (4,229 words) - 01:40, 6 July 2025
  • Thumbnail for Oil sands
    Since a barrel of oil equivalent is about 6.117 gigajoules (1,699 kWh), its EROEI is 5–6. That means this extracts about 5 or 6 times as much energy as is...
    144 KB (18,204 words) - 01:46, 17 June 2025
  • Thumbnail for Energy conversion efficiency
    pumps. Cost of electricity by source Energy efficiency (disambiguation) EROEI Exergy efficiency Figure of merit Heat of combustion International Electrotechnical...
    30 KB (3,025 words) - 16:38, 24 May 2025
  • living creatures is limited by the concept of energy return on investment (EROEI): that any living thing or living societies can survive only so long as...
    10 KB (1,089 words) - 17:13, 16 June 2024
  • invested is a chief cause of the collapse of complex societies. Falling EROEI due to the depletion of non-renewable resources also poses a difficult challenge...
    170 KB (19,880 words) - 18:52, 12 June 2025
  • reduced EROEI, and therefore put a brake on, and potentially reverse, long-term economic growth, leading to secular stagnation. Linked to the EROEI argument...
    19 KB (2,211 words) - 22:17, 13 June 2025
  • Thumbnail for Predicting the timing of peak oil
    CERA, which counts unconventional sources in reserves while discounting EROEI, believes that global production will eventually follow an “undulating plateau”...
    61 KB (6,643 words) - 01:49, 6 July 2025
  • cyanobacteria is unfeasible, as the energy return on energy invested (EROEI) is unfavorable. The EROEI is not advantageous as numerous large, closed loop bioreactors...
    31 KB (3,534 words) - 15:10, 23 May 2025
  • Thumbnail for Ethanol fuel in Brazil
    transport and distribution. After taking all three sectors into account, the EROEI (Energy Return over Energy Invested) for sugarcane ethanol is about 8. There...
    196 KB (19,092 words) - 00:53, 6 July 2025
  • Thumbnail for Renewable energy debate
    to the energy payback time, is the energy returned on energy invested (EROEI) or energy return on investment (EROI), which is the ratio of electricity...
    108 KB (11,958 words) - 19:06, 27 June 2025
  • Thumbnail for Energy efficiency in transport
    important consideration, as is the energy returned on energy invested (EROEI). Between these two factors, roughly 20% must be added to the energy of...
    89 KB (8,674 words) - 00:50, 6 July 2025
  • existing petroleum infrastructure. The energy returned on energy invested (EROEI) of these processes is uncertain and/or has not been measured. Furthermore...
    23 KB (2,767 words) - 06:03, 25 June 2025
  • Thumbnail for Electricity sector in Portugal
    and 3,702 MW in end 2010. In Lisbon, the energy payback time (see also EROEI) in the roof top solar photovoltaic (PV) technology is less than 2 years...
    8 KB (509 words) - 16:04, 1 May 2025
  • Thumbnail for Maximum power principle
    A field known as energy analysis, itself associated with net energy and EROEI, arose to fulfill this analytic need. However, in energy analysis intractable...
    19 KB (2,606 words) - 13:25, 26 March 2025
  • ERO—Electric Reliability Organization. The US designated NERC as its ERO. ERoEI—Energy returned on energy invested ERRA—Energy Regulators Regional Association...
    46 KB (5,251 words) - 09:09, 4 July 2025