SCOTTISH and Southern Energy (SSE) is to spend £3 billion of a near-£7bn investment programme in Scotland as it strives to double its wind farm capacity over next five years, the Sunday 
Herald has learned.

Details of the plans come as the Perth-based utility overtook a fading HBOS to become the largest Scottish company after RBS, with a stockmarket value of £13.1bn. SSE also outlined plans to overtake 
Spanish-owned Scottish Power and Scottish Gas, part of UK giant Centrica, to become the largest power supplier in Scotland within the next five years.

SSE, which trades as Scottish Hydro Electric in Scotland, has earmarked £3bn to raise its renewable electricity capacity from 2GW to 4GW by 2013, having already spent £1.1bn acquiring Irish renewables firm Airtricity in January.

Half of the new money will be spent in Scotland, making a strong contribution to the Scottish government's target of achieving half of all energy from renewable sources by 2020.

SSE already operates some of Scotland's most prominent wind farms including Hadyard Hill in Ayrshire (120MW), Braes of Doune in Stirlingshire (72MW) and Minsca near Lockerbie (27MW). New sites that have already received planning permission include Gordonbush in Sutherland (82MW) and Fairburn in Ross-shire (40MW).

SSE plans to spend a total of £1.25bn on wind energy in Scotland, with the remaining £250 million mostly being spent on upgrading hydroelectric facilities. The remaining £1.5bn of the 
investment earmarked for Scotland will be used to upgrade network 
infrastructure.

Chief executive Ian Marchant told the Sunday Herald: "SSE has the ambition and plans to help transform Scotland's energy infrastructure.

But realising these ambitions will require the right planning policy and delivery framework, and a concerted effort on the part of everyone with an interest in the energy sector in Scotland."

The £3.7bn investment beyond Scotland is being spent in England, Wales, and Ireland. It includes a £380m gas power station at Marchwood near Southampton and a £1.3bn joint 
venture with Texas-based Fluor to build the largest wind farm in the world, with 504MW capacity, at the Greater 
Gabbard site off the Suffolk coast.

The ending of its eight-year stint as Scotland's number two company marks the end of a grim week for HBOS, which plunged in value to little more than £12.4bn after fellow mortgage player Bradford & Bingley was forced to reduce the offer price for its rights issue.

While HBOS shares are down 30% since mid-May, SSE's are up 5% on the back of strong annual results. The Perth company has doubled its 
customer base in the past six years to 8.5m on the back of a strategy combining low prices and strong customer service. In the past year alone, SSE has managed to attract some 700,000 new customers.