COPENHAGEN, Oct 11 (Reuters) - PensionDanmark became thelatest manager of retirement funds to branch out in the hunt forhigher returns, saying it would invest 1.6 billion euros inenergy infrastructure in Europe and the United States.

The Danish pensions group would establish a new fund,Copenhagen Infrastructure Partners, and initially commit 800million euro for investments in energy-related assets other thanwind energy over the next three to four years.