The British firm, whose kit powers major events and covers electricity shortfalls, said pretax profit before exceptional items fell to 63 million pounds ($83 million) in the six months ended June 30, from 71 million pounds a year ago.

It said the result met market expectations.

"I am confident that the changes we have made in the last two years are delivering results, with our first-half performance supporting our view that, Argentina aside, we will grow this year," Chief Executive Chris Weston said.

(Reporting by Esha Vaish and Rahul B in Bengaluru, editing by Louise Heavens)