Base load power plant - Wikipedia

Baseload (also base load, or baseload demand) is the minimum amount of power that a utility or distribution company must make available to its customers, or the amount of power required to meet minimum demands based on reasonable expectations of customer requirements. Baseload values typically vary from hour to hour in most commercial and industrial areas.

...so we can say at the least that there are differing interpretations of the term in English. (I note though that that quote is from a for-the-wide-public glossary article again titled base-load power plant, and the same glossary lacks any article on other loads; so I hazard to assume that Harris Group is imprecise there.) Portuguese is yet another thing. (I'm curious if there is a Mittellast equivalent in your language, or is it lumped together with peak load.)

Finally, as Bruce and Crazy Horse said, the issue is how you supply expected demand, not how you continue to supply it in the idealised form of the traditional way, e.g. a near-constant part and daily periodic part. (Where, as I indicated, the shutdowns of large baseload power plants already represent a deviation from the ideal that has parallels with grid operation in the new regime with high grid peneration intermittent generation.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}