(2) The commission may not delegate to any commissioner, named employee or category of employees under subsection (1) of this section the authority to:
(a) Sign an interim or final order after hearing;
(b) Sign any order upon any investigation the commission causes to be initiated;
(c) Sign an order that makes effective a rule;
(d) Enter orders on reconsideration or following rehearing; or
(e) Grant immunity from prosecution, forfeiture or penalty. [1971 c.655 §12; 1985 c.834 §10]