The UK private equity firm plans to sell down its stake in the business, one of the largest renewable power generators in the UK.
Rumours of a £1bn flotation in May 2012 came to nothing, although AltAssets sources who dismissed the speculation were clear that there was strong interest in an IPO from the banking community.
Having established itself largely in the waste-to-energy sector , the business has since diversified into both hydro and onshore wind and operates 147 power stations across the UK.
Barclays, Deutsche Bank and RBC Capital Markets are running the IPO.
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