March 18 (Reuters) - Global investment firm Avenue

Capital Group said on Tuesday it will sell a portfolio of energy

transition-focused assets in California to Partners Group for

$2.2 billion.

The assets, which include 11 natural gas-fired power plants,

will be sold by Avenue Golden Continuation Fund, a fund managed

by Avenue and operated by Middle River Power.

Avenue, which has over $11 billion in assets under

management, said Guggenheim Securities and Morgan Stanley & Co.

acted as financial advisers on the deal for the company.