For purposes of this chapter, the terms defined in this section shall have the meaning ascribed as follows:
"Regulatory function" means all duties and procedures concerning the execution and enforcement of the laws, rules, orders, directives, duties and obligations imposed for the control and government of the persons or businesses regulated, together with investigative activities incident thereto and procedures inherently administrative or executive in character.
"Quasi-judicial function" means the promulgation of all orders and directives of particular applicability governing the conduct of the regulated persons or businesses, together with procedures inherently judicial.
"Commission" means the Mississippi Public Service Commission.
"Public utilities staff" means those persons employed by the public utilities staff established in Section 77-2-1.
"Public service commission staff" means those persons employed by the Public Service Commission pursuant to Section 77-3-8, Mississippi Code of 1972.