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TGrid
The implementation of a competitive environment in the generation area is conceptually straightforward: agents freely decide to construct generating units and compete for energy sales contracts with utilities and customers. The decision on plant type and size will typically depend on investment and fuel costs, duty cycle, availability rates, etc. However, the plant sitting decision also depends on the transmission cost associated to the energy transport from generation to load centers. For obvious reasons, it is neither feasible nor economical to build independent transmission systems for each generation-load pair.
Under this new environment, the transmission network becomes a service to which all generators and customers have access and it becomes necessary to develop rules which allow the shared use of the transmission system. This transmission service cost is allocated among generators and consumers through the use of Open Access Transmission Tariff (OATT).
Therefore, OATT plays an important role. If well determined, they are responsible for a fair allocation of the transmission costs among the agents and provide efficient economic signals that induce agents to build generation facilities at sites that will lead to the best overall use of the generation-transmission system. The same signals apply to the location of economic activities that increase the system load, such as large industrial consumers.
TGrid has been developed by PSR for transmission regulators and agents worldwide. Therefore it offers several different methodologies for the transmission cost allocation problem. Each allocation scheme has different characteristics of providing economic signals that can be attractive according to the transmission system environment. TGrid includes five different methodologies, classified in categories such as the widely known marginal pricing and the network usage-based allocation.
Tela 1.6.1 |
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