← Business Models: Industry Specific (Infrastructure, Transport & Utilities) (all topics)
Infrastructure contracting models - highways (HAM/BOT/EPC)
What it is
The three highway contracting structures. EPC pays the contractor to build with no ownership or traffic risk; BOT transfers construction, financing and traffic risk to a concessionaire who tolls the road; HAM splits the difference - the authority funds ~40% during construction and pays the balance as annuities, with no traffic risk to the developer
The government has rotated its preferred model repeatedly as private appetite has waxed and waned
Impact on industries
- HAM restored private participation after BOT stalled - developers invest 20-25% of project cost without taking traffic risk, which is what made roads financeable again
- EPC suits contractors without balance sheet capacity, so the mix determines which class of company can compete for a given pipeline
- HAM ties up developer equity for the concession period, so a contractor's growth is capped by its balance sheet rather than its execution capacity
- BOT carries full traffic risk - the early-2010s stalled projects showed the cost - so model choice signals policy confidence in traffic and private appetite