fuel-free
Without energy source
Fuel-free describes systems or processes that operate without consuming fuel—typically meaning no combustion of oil, gas, coal, or other energy sources that must be replenished: fuel-free transportation, a fuel-free heating system.
The term usually emphasizes environmental benefits or independence from fuel costs, though what counts as "fuel" varies by context—solar panels are fuel-free, but nuclear reactors may or may not qualify depending on how strictly one defines fuel.
Of the star
- windAir current outdoors
- electricPowered by current
- renewableCapable of restoration
- hydroelectricGenerated by flowing water
geothermal · battery-powered · photovoltaic · turbine · sustainable · zero-emission · off-grid · sunlight
Net-zero emissions state
- greenColor of vegetation
- eco-friendlyNot harming the environment
- sustainableAble to endure long-term
- smokelessProducing no fumes
solar
Of the star
hydroelectric · geothermal · battery-powered · photovoltaic · turbine · sustainable · zero-emission · off-grid · sunlight · tidal
carbon-neutral
Net-zero emissions state
- greenColor of vegetation
- eco-friendlyNot harming the environment
- sustainableAble to endure long-term
smokeless · decarbonized · net-zero · low-impact · conservation
bicycle
Pedal-powered two-wheeler
sailboat · walking · skateboard · scooter · horse-drawn · rickshaw · kayak · canoe · rowing · glider
fireless
Lacking flames or combustion
- hayboxInsulated container for slow cooking
- sun-driedDehydrated by daylight
- fermentedTransformed by microbial action
cured · cold-pressed · dehydrated · pickled · smoked · ceviche · salad · carpaccio · sashimi · gazpacho
fuel-freediesel-powered
Using diesel fuel combustion
gas-guzzling · oil-burning · coal-fired · internal combustion · gas-powered
fuel, free, fuels, fueled, fueling, refuel, refueled, refueling, freely