Why? Apparently because he COULD!
Here's the letter dated 21 May 2014 sent to Heber City Council members Heidi Franco and Kelleen Potter
After the three new Council members took their elected positions in January. The meeting of 16 Jan began some of the controversy of HL&P Board appointments: (incumbent members felt the need to remain on the board, Mayor McDonald disagreed) "Mayor McDonald indicated he spoke with Blaine Stewart who felt new members would adjust fine. Also, the Heber Light and Power Board bylaws indicated that the Mayor didn’t need the consent of the Council in order to assign other Council members to the board. Council Member Rowland asked to seek clarification on that section of the bylaws. Mayor McDonald read from the bylaws. Mark Smedley stated that language would hinge on
what the rules of the City Council were with regard to committees. Smedley indicated he would like to review that before giving his opinion."
By the 6 Feb meeting, McDonald solidified his position and declared he could appoint whomever he wanted: Mayor McDonald agreed it would be nice to have the consent, but his choices for the appointments would not change. He asked for consent for Council Members Franco and Potter. Council Member Potter moved to approve Council Members Franco and Potter to the Heber Light and Power Board. The motion failed for lack of a second. Mayor McDonald stated as chairman of the Heber Light and Power Board, he would still proceed with appointing Council Members Franco and Potter as members of the board.
On 26 Feb Franco and Potter were active Board Members Franco and Potter took their assignment seriously, asking questions, investigating and as they had campaign worked to find solutions to the recent managerial difficulties - credit card fraud, firing of the CFO, faux Health pay, et al They also discovered the high managerial salaries and released the information to the public.
Mayor McDonald also approved the release of the info on the Heber Power website, without designating any names. During his campaign, Mayor McDonald expressed this on his website:
Mrs. Franco proposed a series of solutions to the Heber Light's problems.
With those proposals and resolutions in a recent Council meeting (videos here) to allow Heber City Manager to audit HLP and questioning Council board salary distribution, and after comments that his appointees were 'politically self-serving' while he was promoting the proposed Rate Increase, it appears the Mayor felt his appointees were going too far and summarily dismissed them.
(Apparently the Mayor reappointed Councilmen Patterson and Bradshaw to the Board.)