What supply contract (PPA) types exist, and what firm-capacity obligations apply?

Two contracting routes coexist. On one side, the open tenders run by the CNEE to supply the distributors through long-term contracts; for example, PEG-4-2022, launched in November 2021, was aimed at contracting guaranteed capacity for EEGSA, DEORSA and DEOCSA. On the other, the term market: bilateral capacity and/or energy contracts between agents, administered by the AMM. The Firm Demand and Efficient Firm Supply principle applies: consuming participants must have their capacity demand contracted for a seasonal year, which runs from May to April. The AMM calculates the Firm Demand that each distributor or large user must contract, which is covered with Efficient Firm Supply, and the differences between Effective Firm Demand and contracted Firm Demand are settled every month. Large users may also declare part or all of their demand as Interruptible Demand, for a period of no less than one year. It is a remunerated ancillary service under the AMM's Commercial Coordination Standard No. 8: the large user offers a price per block that may not exceed the first step of the failure machine; it is paid only when the Load Dispatch Center calls on it; consuming participants pay for it, and if it fails to comply it is not paid and bears the increased cost of replacing the block. The qualification procedure (Annex 8.2) applies to large users connected to the high-voltage transmission system.