The document discusses plans by India's National Mission for Clean Ganga to address pollution in the Ganga River through sewage treatment infrastructure projects using a hybrid annuity-based public-private partnership model. It notes that 30% of existing sewage treatment plants are not operational and 94% do not meet standards. The hybrid annuity model would see the government fund up to 40% of capital costs, with the private operator responsible for the remainder and ongoing operation and maintenance, to be paid through annual performance-based annuities. Special purpose vehicles would oversee project implementation with state governments, urban local bodies and private concessionaires having defined roles and responsibilities. Preparatory activities have begun with the issuance of a request for proposals