---
title: "Hybrid Annuity Model (HAM): Road PPP Explained"
description: "The Hybrid Annuity Model is India's road PPP where government pays 40% during construction and the rest as annuities, unlike BOT or EPC. Key UPSC GS3 topic."
url: "https://modeldiplomat.com/learn/glossary/hybrid-annuity-model"
---

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Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- The Hybrid Annuity Model is a public-private partnership road-financing structure in which the government funds 40 percent of project cost during construction and pays the balance as annuities over the operations period.
- How is risk allocated between the government and the developer under HAM?
- How does HAM differ from EPC and BOT (Toll)?
- How are HAM payments structured and indexed?
- What fiscal implication does HAM create for the government?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

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## Positions at a glance

### Supporters

The Hybrid Annuity Model (HAM) is a contractual framework for highway development introduced by India's Ministry of Road Transport and Highways (MoRTH) and the National Highways Authority of India (NHAI) in January 2016, following Cabinet Committee on Economic Affairs approval. It emerged as a response to the collapse of private investment in road infrastructure between 2012 and 2015, when leveraged developers exited the sector and lenders—stung by stalled Build-Operate-Transfer (BOT) toll projects—refused fresh exposure. HAM was designed as a middle path between the fully government-funded Engineering, Procurement and Construction (EPC) mode and the wholly private-risk BOT (Toll) mode, blending public capital support with private execution discipline. Its legal architecture rests on a Model Concession Agreement (MCA) issued by NHAI, supplemented by NITI Aayog's standardised documentation, with payments structured around a notional Bid Project Cost and an inflation index.

### Opponents

The procedural mechanics distribute capital and risk in defined tranches. During the construction period, the government—through NHAI—contributes 40 percent of the Bid Project Cost in five equal instalments of 8 percent each, released against verified physical milestones such as 20, 40, 60, 80 and 100 percent of works completed. The concessionaire, a private developer, arranges the remaining 60 percent through a combination of equity and debt. Critically, the entire construction-stage public grant is inflation-indexed using a weighted average of the Wholesale Price Index and the Consumer Price Index, insulating the developer from input-cost escalation. Land acquisition, environmental clearances and utility shifting remain government obligations, removing the pre-construction risks that crippled earlier BOT projects.

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Example

In 2016 the National Highways Authority of India awarded its first Hybrid Annuity Model contract for a stretch of National Highway in Maharashtra, after which Larsen & Toubro and Dilip Buildcon became leading HAM concessionaires under the Bharatmala programme.

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