"There are no obvious barriers to the mass production of electric tractors and combine harvesters: the weight of the batteries and an electric vehicle’s low-end torque are both advantages for tractors." - Thomas Page

Dream Concept = Roomba GPS Tractor. Added 12-7-09 Caterpillar Builds World’s First Hybrid Bulldozer http://gas2.org/2009... , pstp ref ag eng - Thomas Page

http://www.bloomberg.com/video... , 2 -7 sort NH2 Hydrogen Powered Tractor and Energy Independent Farm http://en.wikipedia.org/wiki... , The concept of NH2 Hydrogen Tractor. NH2 Hydrogen Tractor. New Holland has developed the Energy Independent Farm, a new approach, where farmers are meant to be able to generate their own energy to run their farm and agricultural equipment. The basis of this is the usage of Hydrogen generated from renewable sources which farmers have at their disposal: wind, solar, waste or biomass, according on its availability in each particular farming area. The electricity is then converted into Hydrogen using an electrolyser; this technology is used to split water into hydrogen and oxygen gases. Basically, it needs water and electricity as inputs; the hydrogen is then stored at the farm in high-pressure tanks and it is ready to be used as a free and clean fuel which can be used directly in farm machinery or in generators to provide electrical power and heat for buildings and numerous applications. Hydrogen was chosen because it is an efficient energy carrier, it works like a battery, accumulating energy and it is more advantageous and cleaner than a conventional battery. The hydrogen powered NH2 tractor is based on a model of the T6000 range; it has 106 hp and is able to perform all of the jobs of a tractor of this type, while operating virtually silently and emitting only heat, vapour and water.[33] Its internal combustion engine has been replaced with fuel cells that generate electricity. The compressed hydrogen stored in a special tank reacts with the oxygen in the air inside the cell to generate water and electricity. This powers the electric motors which drive the main transmission and the auxiliary systems of the tractor. The fuel cell generates less heat than an internal combustion engine, offers a consistent output of power and does not produce polluting nitrogen oxides, soot particles or carbon dioxide. It is quicker to refuel, it takes 5 minutes to fill a tank compared to hours required by batteries.[citation needed] Product specification Power: 75 kW (106 hp)[34] Transmission: CVT through electrical motor PTO : CVT through electrical motor NH2 Hydrogen Powered Tractor was awarded with Gold Medal for technical innovation at SIMA in 2009.[35 , 2 -7 http://agriculture.newholland.com/uk... http://www.pbs.org/wgbh... http://en.wikipedia.org/wiki... , http://www.treehugger.com/cars... - Thomas Page

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Electric Tractor http://www.versaland.com/2012... [ Mars Exploration Rover http://en.wikipedia.org/wiki... http://en.wikipedia.org/wiki... [[ 9 -30 http://sydney.edu.au/enginee... http://sydney.edu.au/news... - Thomas Page