HAM Highway Contract

The Hybrid Annuity Model (HAM) is a PPP structure for national highway development where the government pays 40% of the project cost during construction as construction-phase payments, and the developer finances the remaining 60% and recovers it through semi-annual annuity payments from NHAI over 15 years after project completion. HAM was introduced by NHAI in 2016 as a middle ground between government-funded EPC and fully private-funded BOT-Toll.

What is a HAM Highway Contract in government procurement?

HAM emerged as a solution to two problems that had stalled highway procurement in 2014-15. Under BOT-Toll, private developers bore all construction and traffic revenue risk, and with traffic projections frequently over-optimistic, many BOT-Toll concessionaires were financially distressed or in default. Developers and their lenders had lost appetite for further BOT-Toll. At the same time, the government wanted to leverage private sector project management efficiency and not fund 100% of construction costs (as under EPC).

HAM's structure is as follows. NHAI invites bids from private developers for a defined highway section. The developer (concessionaire) designs, finances, builds, operates, and maintains the road over a 17.5-year concession (approximately 2.5 years for construction + 15 years of operations). NHAI pays the developer in construction-phase payments: 5 milestone payments of 8% each = 40% of project cost during construction. After construction, NHAI makes 30 semi-annual annuity payments over 15 years, covering the remaining 60% plus the developer's financing costs (linked to bank rate + spread).

The developer arranges project finance for the 60% not covered by NHAI's construction-phase payments, typically a mix of equity (20-30% of 60%) and debt (70-80% of 60%) from banks and financial institutions. The annuity stream from NHAI (which is sovereign risk) provides the security for lenders, enabling project finance.

Bidding in HAM involves competing on the quoted Project Cost, technically the Bid Project Cost that determines annuity quantum. Lower Bid Project Cost = lower annuities = bid advantage. Alternatively, some NHAI HAM tenders bid on the percentage of NHAI grant sought (competing on how little grant is needed).

Why it matters for bidders

HAM combines government payment support with private sector execution. For developers with project finance capability and construction expertise, HAM provides the best of both worlds, government-backed annuity revenue certainty with private sector upside from efficient construction. Developers who complete construction early and under budget retain the benefit; cost overruns erode equity returns.

The financial structure is complex. Bidders must model the full project finance, equity investment, debt terms, annuity receipts, operation and maintenance costs, to arrive at the right Bid Project Cost. Underbidding in HAM (quoting too low a project cost) means the annuity stream does not cover financing costs, generating losses throughout the 15-year operations period. The financial modelling discipline required for HAM bids is significantly more sophisticated than for EPC.

Construction capability is equally important. Because the developer's 60% investment is recovered only over 15 years, completion delays directly reduce financial returns. Companies that can achieve early completion before the concession period end earn additional annuity payments, an incentive structure that does not exist in EPC.

Example

NHAI floats a HAM tender for a 55-km section of NH-66 coastal highway. Two developers bid, Developer A quotes a Bid Project Cost of Rs 1,200 crore, Developer B quotes Rs 1,150 crore. Developer B wins (lower cost = lower annuity demand). Developer B arranges Rs 690 crore of project debt from a bank consortium and deploys Rs 172 crore of equity. NHAI provides Rs 460 crore (40%) during construction in 5 milestone payments. After construction in 28 months, NHAI begins paying 30 semi-annual annuities of approximately Rs 60 crore each (the exact quantum adjusted for CPI indexation). Developer B's equity IRR at this annuity level is approximately 13%, satisfying its investors.

Key rules / thresholds

HAM concession agreements follow NHAI's Model Concession Agreement for HAM projects. The construction period is typically 910 days (2.5 years) from the appointed date. Concession terminates 15 years after project completion. Annuity payments are linked to maintenance standards, failure to maintain IRI and other performance parameters leads to annuity deductions. NHAI can terminate for cause if performance standards are persistently not met, with buyout payment to the developer at a pre-agreed formula.