This is an interesting point about energy market balancing but it has causality backwards. Spain simply has a better energy mix than Germany, no matter how big the spread between the countries is as a function of interconnectedness.
Spain also has pretty sensible legislation that is somewhat green. For large public areas the lowest allowed AC setting is 27°C / 81°F. Where-as in America you'll go to a mall and it'll be 65°F. https://www.catalannews.com/politics/item/spain-limits-air-c...
Probably doesn't make a ton of difference. But I found that very respectable. It made me hopeful they have other basic green sensibilities.
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The article is a mix of facts and figures on the supply side. However, the real reason for the current cheap prices is the lack of demand. Spain's economy isn't doing well and they have hurt their tourism industry with politics. That's most of the reason for the temporarily cheap power that they mostly import from their neighbor. Being dishonest about their energy policy is pure politics.