# ANEEL approves staged hydropower participation in renewable curtailment sharing

> Brazil’s regulator approved a new approach to sharing energy-related generation cuts, with hydropower entering the mechanism gradually after testing.

- **Source date:** 2026-10-06
- **Original source:** [Agência iNFRA](https://agenciainfra.com/blog/reguladora-decide-ratear-prejuizo-de-curtailment-entre-renovaveis/)
- **Reading time:** 1 min
- **Language:** en
- **URL:** https://voltformer.com/news/aneel-renewables-hydro-curtailment-sharing-rule-october-2026
- **Markdown:** https://voltformer.com/news/aneel-renewables-hydro-curtailment-sharing-rule-october-2026.md

## A shared rule for renewable cuts

ANEEL’s board voted 4–1 on 6 October to share energy-related curtailment across wind, solar and eligible hydropower plants. Hydropower units with turbinable spilled energy will join in stages after the system preparation and shadow-testing periods. The decision concludes the third phase of Public Consultation 45/2019, which has addressed operating criteria for reducing or limiting generation in the national grid.

[Agência iNFRA](https://agenciainfra.com/blog/reguladora-decide-ratear-prejuizo-de-curtailment-entre-renovaveis/)

## Hydro participation will ramp up

ONS receives six months to prepare its systems, followed by a 12-month shadow period before the rule takes effect. Hydropower’s eligible share then rises through four cycles: 25%, 50%, 75% and 100%. The vote concerns energy-related cuts; ANEEL will separately review whether cuts classified as external availability or electrical reliability should be reclassified.

[Agência iNFRA](https://agenciainfra.com/blog/reguladora-decide-ratear-prejuizo-de-curtailment-entre-renovaveis/)

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