It hopes to sign up around a dozen civils and M&E partners to deliver target cost contracts over the AMP6 period.
Chosen firms will also be offered a possible AMP7 investment cycle extension, depending on performance.
These works will involve elements of early involvement with the internal design team or design consultants during optioning and design stages.
This time around there will be a greater emphasis on capital maintenance works from the capital delivery partners.
Works will include the construction of new assets and refurbishment, modifications and maintenance of water and waste water treatment works and above and below ground distribution networks and infrastructure.
PQQs can be downloaded from the web portal by 8 August.