LONDON - The world's largest renter of power generators, Aggreko, will likely surpass its investment targets because of increased demands and widening margins, the company announced.

Executive chairman Chris Masters said the company has already invested about 60 percent of the $142 million it had planned to spend on new equipment this year. And there is no reason not to invest more while maintaining returns and margins, he added.

U.S. utility-related demand is seen as a major contributor to the company's growth during the first half of the year.

Aggreko operates in more than 50 countries. Its latest venture is in Ponce, Puerto Rico. It markets three product units: power generation, temperature control and air supply, with the power generation unit accounting for about 70 percent of all sales.