As used in this chapter, unless specifically defined otherwise or unless the context indicates otherwise:
"Commission" shall mean the Washington utilities and transportation commission;
"Committee" shall mean the oil and gas conservation committee established by *RCW 78.52.020;
"Natural gas" shall mean gas either in the earth in its original state or after the same has been produced by removal therefrom of component parts not essential to its use for light and fuel;
"Natural gas company" shall mean every corporation, company, association, joint stock association, partnership or person authorized to do business in this state and engaged in the transportation, distribution, or underground storage of natural gas;
"Underground reservoir" shall mean any subsurface sand, strata, formation, aquifer, cavern or void whether natural or artificially created, suitable for the injection and storage of natural gas therein and the withdrawal of natural gas therefrom;
"Underground storage" shall mean the process of injecting and storing natural gas within and withdrawing natural gas from an underground reservoir: PROVIDED, The withdrawal of gas from an underground reservoir shall not be deemed a taking or producing within the terms of RCW 82.04.100.