Price proxy · CMO Semi-Horário
Pricing — ONS CMO Semi-Horário (PLD proxy)
Tartana uses ONS CMO (Custo Marginal de Operação, semi-horário per submercado) as a public PLD proxy. CMO is the output of the short-term optimization ONS re-runs every half-hour; CCEE uses it to set PLD after applying monthly PLD_min / PLD_max. In hydro-surplus years (2023) CMO falls to ~R$ 6/MWh while PLD floors at ~R$ 69/MWh — so 2023 backlog R$ on this page is a conservative lower bound. Swap in CCEE PLD horário when a Brazilian-egress fetcher is wired.
Headline pricing — last 12 months
Mean CMO — 12M
volume-weighted across submercados
Min observed — 12M
lowest ½-hour CMO in last 12 months
Max observed — 12M
highest ½-hour CMO in last 12 months
Mean CMO — 2023
hydro-surplus year · PLD floored ~R$ 69
Latest month — CMO by submercado
Daily CMO by submercado
Monthly CMO — last 24 months
Annual mean CMO — faceted by submercado
2023 anomaly. Mean CMO across submercados fell into the R$ 20–40/MWh range for most of the year, well below PLD_min. Any 2023 backlog R$ computed with CMO should be read as a floor — actual PLD would have compensated at ~R$ 69/MWh for most of that year. The gold dashed line at R$ 69 in the charts above marks that floor.
Next upgrade. Replace CMO with CCEE PLD horário (monthly, per submercado). PLD is the settlement price after floor/ceiling; substituting it reprices 2023 backlog compensable R$ up materially without changing MWh volumes or the plant universe.