EROI: definition, history and future implications. Charles A. S. Hall State University of New York College of Environmental Science and Forestry Syracuse, N.Y. Cutler J. Cleveland Director, Center for Energy and the Environment Boston University Boston, Mass.
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EROI: definition, history and future implications
Charles A. S. Hall
State University of New York
College of Environmental Science and Forestry
Cutler J. Cleveland
Director, Center for Energy and the Environment
Presented at ASPO -US conference
Denver November 10, 2005
Energy return on investment for an activity:
Energy delivered to society
EROI = __________________________
Energy put into that activity
Usually consider energy invested from society
We used Yield per Effort concepts from fisheries…..
NY Times Oct 10, 04
Hall & Cleveland 1981 Science
US Oil Field Size
Technology will overcome depletion
THE GEOLOGISTS’ ARGUMENT
Depletion is real and will overwhelm
Who is right??
(EROI = 100:1)
“Best First” Principle
The energy cost of getting the next barrel is going way up
Data quantity and quality
(Can you help us?)
1) Data: U.S. Bureau of Commerce,
Wood Mackenzie, John S. Herold
2) Quality of energy in or out:
Putting in one unit of electricity to
generate three units of heat does
not make sense 3) Boundaries: key issue. How far do
we extend boundaries of analysis?
Are there “correct” boundaries? (no)
Big Question: What is E ?
The Problems: Boundries
E Indirect (?)
Fuel vs. Energy production us system
E To Allow Use
Labor Support ?? e.g.
- Soil Erosion
- Loss of Ecosystem
Thanks to the Santa Barbara Family Foundation