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Available Transfer Capability (ATC) is calculated by taking the total transfer capability (TTC) of a transmission path and subtracting the existing transmission commitments (ETC), transmission reliability margin (TRM) and capacity benefit margin (CBM). The formula is: ATC = TTC - ETC - TRM - CBM. This calculation ensures that the transmission system can accommodate additional power transfers while maintaining reliability and stability.
ATC is important for renewable energy integration because it determines the capacity of the transmission network to accommodate additional power generated by renewable sources like wind and solar. By assessing ATC, grid operators can identify potential bottlenecks and plan necessary upgrades to ensure that renewable energy can be efficiently and reliably transmitted to where it is needed, supporting the growth of clean energy.
Several factors can affect ATC, including transmission line capacity, system demand, generation patterns, maintenance activities and unexpected outages. Weather conditions and the variability of renewable energy generation can also impact ATC. Grid operators continuously monitor these factors to adjust ATC values and ensure the safe and reliable operation of the transmission network.
Grid operators use ATC in both planning and real-time operations to manage the flow of electricity and ensure system reliability. In planning, ATC helps identify where transmission upgrades or new infrastructure are needed to accommodate future power flows. In real-time operations, ATC values guide decisions on power dispatch, load balancing and congestion management, ensuring that the transmission network operates within safe limits.
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