"Our colleagues have executed well on a high activity level, which along with a favourable mix of projects contributed to Vestas achieving extremely solid results on revenue, EBIT margin, net profit, and free cash flow," chief executive Anders Runevad said in a statement.
Order intake had been "in line with expectations," he said.
Revenue was expected to reach at least €9.5 billion ($10.7 billion) this year rather than a previous estimate of at least nine billion euros, according to the group.
The EBIT (earnings before interest and taxes) margin would be at least 12.5 percent this year, rather than 11 percent.
Net profit in the second quarter more than doubled to €278 million from €125 million in the same period a year ago, as revenue gained 46 percent to 2.56 billion euros.
The US government's decision to extend wind production tax credits, or PTCs, means "Vestas' team in the US will be extremely busy until December 31st, because there is a high level of activity in the US market," Runevad told Danish news agency Ritzau.
The group also said it would buy back shares worth 2.98 billion kroner (€400 million, $453 million) starting on Thursday and ending on December 30th.
"It is a very strong set of results, where Vestas blows away all expectations and delivers better than expected on all parameters," Alm. Brand analyst Michael Friis Jorgensen told Ritzau.
Shares in Vestas were 9.3 percent higher in mid-morning trading on the Copenhagen bourse, where the main index was 0.7 percent higher.