Didn't find any direct news mentioning specifics thermal plant being retired because of this, but I found several news of thermal plants being retired in the region (because some cities in other states in Amazon region were not connected).
> Another highlight was the transmission line's excess capacity, which currently transports four times more energy than Roraima's current consumption. This surplus provides the conditions to boost the state's economic development and opens up trade opportunities with neighboring countries and even the Caribbean.
Additional links:
https://www.argusmedia.com/en/news-and-insights/latest-marke...
https://valorinternational.globo.com/economy/news/2025/09/05...
https://canalsolar.com.br/en/Linhao-Manaus-Boa-Vista-connect...