seems like it’s around 0.5-1% of total capacity 😔, but still poggers 
edit from real source https://en.granma.cu/mundo/2025-11-13/chinas-cooperation-with-cuba-in-the-energy-sector-remains-strong-and-steady
The official launch of Mártires de Barbados II was led by the First Secretary of the Party’s Central Committee and President of the Republic, Miguel Díaz-Canel Bermúdez, and it is now connected to the SEN, as are its 5 MW counterparts built in several provinces, with a combined generation capacity of 35 MW. Following the completion of this phase, the second stage, already underway, is expected to be completed by next April and will include 13 5 MW PSFV and two 10 MW PSFV, with a total power of 85 MW and batteries to store 20% of the generation produced.
that would put maximal capacity at 3% which is mega pog 
probably at utilization rates of 1-1.5%, depending on batteries and transmission
i mean, you can oversupply macmansion with just roof solar, so single family houses likely can deal with it just on their own territory, if with reduced output per person, it’s rare they have energy intensive productions (by a lot of accounts, home solarification is like 4-5k in materials, without fullblown batteries and ignoring grid issues)