Public-Private Partnerships in Port Infrastructure Development and Their Effect on Cargo Throughput: Evidence from Onne Port Complex, Rivers State

This study investigates the impact of public-private partnerships (PPPs) in port infrastructure development on cargo throughput at the Onne Port Complex in Rivers State, South South Nigeria. Onne Port, one of Nigeria's dedicated oil and gas logistics ports, has been the subject of concession arrangements and infrastructure investment programmes designed to improve handling capacity and operational efficiency. PPP arrangements in port development have been associated in international literature with increased investment, improved equipment standards, and enhanced cargo handling capacity. Using a descriptive analytical design, data were gathered from structured questionnaires administered to 60 terminal managers, port authority officials, shipping agents, and logistics coordinators at Onne Port. The study examines PPP investment components, operational capacity changes, technology upgrades, and stakeholder coordination outcomes associated with concession arrangements. Cargo throughput is measured in twenty-foot equivalent units per annum, vessel turnaround time, and berth occupancy rate pre- and post-PPP intervention. Documentary analysis of Nigerian Ports Authority reports supplements survey data. The study draws on PPP effectiveness and port infrastructure development literature from developing country port contexts. Findings are expected to demonstrate measurable throughput improvements attributable to concession-driven equipment upgrades and operational management changes. Recommendations address the Nigerian Ports Authority, the Infrastructure Concession Regulatory Commission, and prospective port investors on structuring PPP agreements for sustained throughput growth. Keywords: public-private partnerships, port infrastructure, cargo throughput, Onne Port, Rivers State.