Substantially lower net energy
return than gasoline
Various studies debate whether the net energy
from ethanol is even positive.
Of the total net energy
consumption reported by the Department of Energy, coal and natural gas rank first and each accounted for 29% of the total net consumption.
The New Residential Zero Net Energy
Action Plan was developed through a collaborative 18-month period and represents the work of more than 150 stakeholders in residential building, architecture, finance, clean energy, technology, and various state agencies.
is defined as ME minus heat increment (HI) (Birkett and de Lange, 2001).
Animals were weighed at the beginning and at the end of the experimental period to calculate daily feed intake (ADFI), digestible lysine intake (DLI), net energy
intake (NEI), average daily gain (ADG), and feed conversion (F:G).
Hall adds that net energy
numbers are hard to pinpoint because nearly all data on energy use in the U.
Like hybrid cars, hybrid or zero net energy
houses reduce energy requirements with smart design, energy-saving construction techniques, and home-generated power.
It is a net energy
exporter and coal is one of its largest export commodities.
A means of measuring net energy
is Energy Return on Investment (EROI).
The government spends more than $3 billion a year to subsidize ethanol production when it does not provide a net energy
balance or gain, is not a renewable energy source or an economical fuel," Pimentel said.
One of the key arguments over biomass energy concerns the net energy
contribution of biomass--how much energy is gained from the crop.