Hyflux Ltd. (HYF), Singapore’s biggest water treatment company, rose to a 2 1/2-month-high after winning approval to raise the cost of building the island’s largest desalination plant.

Revised costs of S$1.05 billion ($829 million), an increase from S$890 million, were approved to construct the Tuaspring plant, Singapore’s second seawater desalination facility, Hyflux said in a statement. The shares climbed 3.1 percent to S$1.485, the biggest gain since July 4 and their highest since April 19.

The stock has risen 23 percent this year.

To contact the reporter on this story: Randall Hackley in Zurich at rhackley@bloomberg.net

To contact the editor responsible for this story: Randall Hackley at rhackley@bloomberg.net