[geuis]

Solar installations in capital societies have taken off due to initial government and private sector investment.

Despite Cuba opening up over the last decade, there's still not good investment infrastructure to support large scale solar and wind installations. In other words, it's still a semi communist government that leans much more towards Soviet style versus China.

The article itself talks a bit about how the general electrical infrastructure in the country is aging and needs maintenance and upgrades.

Combine the government policies, general economy, hostility to foreign investment, etc and you hopefully get an idea of why solar hasn't had a major impact.