US-based buyout firm Riverstone is to carry out one of the year’s largest renewable energy deals, agreeing to pay around $350m for a Norwegian services company, after promising certainty of financing to the vendors.

Riverstone is paying NKr90 per share, a total of NKr1.2bn ($206.1m/€143.6m), for Oslo-listed Seajacks International, an owner and operator of boats to lift equipment in the southern North Sea, servicing the offshore wind farm market and the conventional offshore oil and gas service industries.