Scottish Power has consolidated its financial PR, dropping five-year incumbent Brunswick and appointing Tulchan Communications on a full brief.
The electricity and water group originally assigned Tulchan in August to work alongside Brunswick as joint adviser.
Tulchan was launched in May by ex-Brunswick partner Andrew Grant. While at Brunswick, Grant led the Scottish Power account for five years.
However, following the recent review of its PR needs, Scottish Power has appointed Tulchan as its sole retained financial and corporate PR agency.
Scottish Power director of corporate affairs, Dominic Fry - to whom Tulchan will report - said: 'They will be helping us with IR, financial and corporate PR, providing us with very high level counsel.
'They are a great team and understand what we do and are absolutely right for the job at hand,' he added.
Cross-border IR firm Taylor Rafferty, which holds an equity stake in Tulchan, provides US IR support for Scottish Power.
Scottish Power is one of the most powerful forces in the UK utility industry with a market capitalisation of nearly pounds 10 billion.
Over the last five years, the company has acquired a number of interests - in 1995, it acquired regional electricity company Manweb and the year after it bought Southern Water.
It was also the first British utility to move into North America, buying Utah electricity group Pacificorp last November for pounds 8.8 billion.
Its telecommunications business Thus floated last year.
Scottish Power still owns a 51 per cent stake in the group, which started as Scottish Telecom in 1994.