available as another possibility
alternative
relating to an atom or atoms
atomic
protect (something, especially an environmentally or culturally important place or thing) from harm or destruction
conserve
the using up of a resource
consumption
following the usual or widely accepted way of doing things
conventional
an amount that has to be paid or spent to buy or obtain something
cost
the good use of time and energy in a way that does not waste any
efficiency
to bring into existence
generate
relating to the nucleus of an atom
nuclear
a law, regulation, procedure, administrative action, incentive, or voluntary practice of governments and other institutions
policy
to supply or make available (something wanted or needed)
provide
not depleted when used
renewable
something wanted or needed
requirement
a lack of something needed
shortage
relating to or determined by the sun
solar
able to be maintained at a certain rate or level
sustainable
