Chuck Keller says that's partly because Powerball generates large jackpots less frequently than its operators would like.
But Keller declined to give any details about the changes being explored. He says details about the revamped game should be decided in mid-May and put into effect for players in October.
Keller's comments came Tuesday during a briefing of North Dakota lawmakers about their state lottery.
Powerball is administered by the Iowa-based Multi-State Lottery Association. Association director Charles Strutt declined to give details about proposed changes or confirm the timeline Keller mentioned.
The Powerball lottery is played in 29 states including Pennsylvania, the District of Columbia and the U.S. Virgin Islands.
