In addition to our lower emission and low noise two-cycle hand held equipment that we have been utilizing, we have now begun to use battery powered equipment on our downtown, green roof and rooftop gardens. Battery powered landscape tools are still relatively new but the technology has improved to the point that they are becoming a viable option for specialty care areas. This equipment is safer to take in buildings and elevators and produces no emissions and lower noise which is much better for the downtown rooftop gardens. Stihl, maker of the gas powered hand held equipment we use is also the leader in battery powered equipment. http://www.stihl.com.au/Cordless-Power-System