There are a number of variations of the basic BOT model. Under construction company transfer contracts (BOOT), the contractor owns the project during the project period. Under work leasing contracts (LTOs), the government leases the project to the contractor for the duration of the project and implements it. Other variants have to build the contractor project as well as the project. An example is a DBOT (design-build-operate transfer) contract. In the past, U.S. electricity suppliers were buyers and sellers, but not renewable energy producers. Due in part to fiscal and accounting constraints, vertically integrated and regulated utilities have traditionally entered into power purchase contracts (PPPs) to source solar, wind and other renewable energy from independent electricity producers (IPPs), instead of building such projects and integrating them into their tariff base. For many distribution companies, this seemed like a missed opportunity, as they generally have a return on the equity invested in power plants, transmission lines and distribution lines, but not on electricity purchased by others.
In general, a project is financially viable for the private enterprise if the revenues generated by the project cover its costs and provide an adequate return on investment. On the other hand, the viability of the project for the host government depends on its effectiveness in relation to the cost-effectiveness of the public funding of the project. Even if the host government could borrow money on more favourable terms than a private company, other factors could offset this particular benefit. For example, the know-how and efficiency that the private enterprise must bring, as well as the transfer of risks. As a result, the private entity bears a significant portion of the risk. Here are some of the most common risks: examples of countries using BOT are Pakistan Thailand, Turkey, Taiwan, Bahrain, Saudi Arabia, Israel, India, Iran, Croatia, Japan, China, Vietnam, Malaysia, Philippines, Egypt, Myanmar and some U.S. states (California, Florida, Indiana, Texas and Virginia). However, in some countries, such as Canada, Australia, New Zealand and Nepal, the Build-Own-Operate (BOOT) transfer is used. The first BOT was for the China Hotel, built in 1979 by the Hong Kong-listed conglomerate Hopewell Holdings Ltd (controlled by Sir Gordon Wu). The BOT scheme refers to the initial concession of a public body such as a local government to a private company to build and operate the project in question. After a fixed period, usually two or three decades, control of the project is returned to the public body. An example of this agreement is the contracts in which a state-owned supply company acts as a buyer and purchases electricity from a private facility.
Under a traditional concession, the company would sell directly to consumers without government intermediaries. BOT agreements often set minimum prices that the buyer must pay. A BOT project is generally used for the development of a discrete asset and not an entire network, and it is generally completely new or in the green meadow (although it is a remediation). Under a BOT project, the project company or operator typically generates revenue through a fee charged to the company or government, not through rates charged to consumers. A number of projects are called concessions, such as toll road projects. B that are under construction and have a number of similarities to THE BOCs.  A building and operating transfer contract (BOT) is a funding model for large projects, usually infrastructure projects developed through public-private partnerships.