The $6 billion New Hampshire Retirement System has issued a request for proposals for alternative investment consultants with experience in private equity, infrastructure, commodities, hedge funds and portable alpha strategies.

Firms selected will assist the system in establishing alternative investment policies and guidelines, portfolio construction, manager searches, due diligence and monitoring.

The deadline for the RFP, which can be accessed on system’s Web site is April 30.

NHRS currently has a target allocation of 5% to alternative investments, consisting of p.e., hedge funds and timber funds, but is looking to double its exposure in the space.

On the absolute return front, it has committed $31.5 million to Arden Institutional Advisers, a $13 billion fund of hedge funds, and $20 million to Relational Investors, a $7 billion activist shop.