Transmission projects can look technically similar while being procured and paid for in very different ways. India’s TBCB, the UK’s offshore transmission owner tenders, Brazil’s transmission concessions and a US cost-of-service rate are useful comparisons—but they are not different names for one contract. When reading an unfamiliar RFP, separate four questions: What is competed? Who owns the asset? How is revenue set and adjusted? Who carries design, construction and operating risk?
For the Indian foundation, start with TBCB in Transmission: What Changes Commercially. For the engineering consequences of availability-linked payment, see Why Availability Matters to TBCB Transmission Design.
Four examples, four distinct structures
India: inter-state TBCB
A provider is selected competitively against a quoted transmission charge and performs under a project TSA. A published RFP/TSA specifies the assets, a 35-year example term, technical obligations and availability-related monthly charges. Engineering review: project technical schedules, CEA requirements, route and soil risk, commissioning milestones, availability calculation and O&M duties.
Great Britain: offshore transmission owner (OFTO)
Ofgem tenders for owners of specific offshore transmission assets. Its licence guidance describes a tender revenue stream and availability-related revenue adjustments. This is an offshore asset-transfer and licensing regime, not a general synonym for Indian TBCB. Engineering review: asset condition and transfer boundary, offshore access, cable and platform interfaces, licence conditions and availability definitions.
Brazil: transmission concessions
ANEEL explains that for auctioned facilities the efficient revenue is set by the lowest offer. The framework uses Receita Anual Permitida (RAP, annual permitted revenue), with quality-related adjustments. Engineering review: concession scope, auction documents, local network requirements, revenue adjustment and performance rules, route and environmental permissions.
United States: regulated transmission rates
FERC describes cost-of-service and formula-rate approaches for transmission service. Order No. 1000 allows—but does not require—regional competitive solicitations for certain projects. A competitive developer selection and a cost-based rate can therefore coexist. Engineering review: which regulator and tariff apply, regional planning and cost allocation, selected-developer obligations, siting approvals and interconnection requirements.
These are selected examples, not a country-by-country rulebook. Each programme changes over time, and individual tender or licence documents control the project.
India also has a regulator-determined transmission tariff route under Section 62 of the Electricity Act. The distinction is about how the tariff is determined or adopted, not a claim that every Section 62 asset has the same ownership or delivery structure. CERC's current transmission tariff framework and individual tariff orders provide the applicable detail. Calling Section 62 an exact overseas equivalent of a rate-base or RAB model would hide important differences.
Terms that are often mixed together
TBCB or tender revenue stream describes a way competition influences the charge or revenue for a defined transmission service. The mechanism and risk allocation still depend on the jurisdiction's documents.
Concession, BOO and BOOT describe legal rights and asset ownership or transfer obligations. They do not, by themselves, tell you whether revenue is a fixed charge, a regulated allowance, an availability payment or something else.
Regulated asset base, rate base, revenue cap or price control describe regulatory ways to determine or constrain allowed revenue. They are not one universal formula, and they do not prove that no competitive tender took place at an earlier stage.
EPC or turnkey describes a construction delivery arrangement. The EPC contractor may build a line or substation while a separate utility, concessionaire or licensed owner holds the transmission asset and receives the revenue.
Availability payment or adjustment describes a performance link. It says little until the contract defines the measured asset, exclusions, reporting period, target, cap and payment formula.
The engineering lesson is consistent, even when the commercial model is not
No payment label specifies a breaker rating, earthing grid or relay setting. The engineer still needs the local law and grid code, utility connection requirements, project specification, site data and applicable technical standards. International standards such as IEC or IEEE may be incorporated, but they do not replace a jurisdiction's legal and network requirements. In particular, “NERC” in North America refers to a reliability framework; it is not an equipment-design code that can be substituted for a project specification.
Commercial structure does affect the decision process. It determines who approves a design change, who pays for unforeseen ground conditions, whether a maintenance outage reduces revenue, and who owns a component at handover. Those questions should be settled before reusing a technical approach from another market.
Five questions to ask when a foreign RFP arrives
- What is being competed: construction price, annual service charge, revenue entitlement or developer appointment?
- Who will own, operate and eventually transfer the asset?
- Which document defines payment, availability and relief events?
- Which authority approves the design, grid connection and operation?
- Which risks remain with the bidder after award, and which inputs can be verified before bidding?
Answer those questions first. Then build the technical design basis and whole-life option comparison for the actual project rather than translating a familiar acronym into a new jurisdiction.
Frequently asked questions
Is OFTO the UK's name for Indian TBCB?
No. Both use competition and transmission revenue, but OFTO is a specific UK offshore licensing and asset-transfer regime. The bid, asset boundary, duration and performance rules must be read from the relevant tender and licence.
Does “EPC turnkey” tell me how the transmission owner earns revenue?
No. EPC states how construction is contracted. The owner's revenue may be set under a separate tariff, concession, licence or service agreement.
Does a regulated rate mean there was no competition?
Not necessarily. A project developer can be selected through a competitive process while the transmission rate is subsequently determined under a regulated framework.
Explore related Elegrow services
- Substations, Lines & Grids — transmission asset and engineering scope.
- Engineering Design — support from concept through detailed design.
- Power System Studies — technical studies for the network and connection.
Working across markets? Discuss the project scope with Elegrow.
