If a winner isn't drawn on Wednesday night, the Powerball jackpot will grow to $2 billion, with a cash value of $1.24 billion.
Powerball told CNNMoney via email that the prize for Wednesday's drawing will not change from its current level -- $1.5 billion.
This is already by far the biggest jackpot ever recorded by any country.
If a winner isn't drawn, it will be the 20th without a grand prize winner. The current pot has been growing since November 4.
The jackpot broke into the top 10 biggest in U.S. history on January 3 when it hit $400 million.
Tickets for Powerball can be purchased in 44 states, Washington, D.C., Puerto Rico and the U.S. Virgin Islands.
Wednesday night's drawing will take place at 10:59 pm ET.