As used in this act:

(a) “Party” means any affected utility customer who intervened at the public hearing of the board held pursuant to Kan. Stat. Ann. § 13-1228a, and presented testimony of witnesses under oath, conducted cross-examination of employers and representatives of the board, presented oral arguments, and filed written briefs. “Party” does not mean a person who made a limited appearance for the purpose of presenting a statement for or against a rate decision of the board.

(b) “Decision” means any rate decision of the board made pursuant to Kan. Stat. Ann. § 13-1228a.