The Powerball lottery jackpot has climbed to $US1.5 billion (NZ$2.29 billion), making it the largest-ever US lottery prize as well as the world's biggest potential jackpot for a single winner.
The payout has increased due to strong ticket sales on Monday (local time), said Texas Lottery Commission spokeswoman Kelly Cripe on Tuesday.
The Powerball lottery drawing will be held on Wednesday. The game is played in 44 states, Washington, D.C. and two US territories.
The jackpot is worth $US930 million if a winner chooses an immediate cash payout instead of annual payments over 29 years, according to the Multi-State Lottery Association.
The grand prize in Wednesday's drawing is the world's richest lottery jackpot that could go to a single ticketholder, and the amount is expected to rise further before then, according to lottery officials.
The Powerball jackpot has been growing ever since the last winner was drawn in November.
While the current $US1.5 billion prize is by far the largest ever up for grabs in North America, Spain's El Gordo lottery, or "the Fat One," had a prize pool of $US2.45 billion in December 2015. A year earlier, it totalled $US2.7 billion.
But El Gordo payouts are awarded to thousands of ticketholders while Powerball's riches could go to a single ticketholder.Reuters