The A/C cannot keep up the load, due to the exteme heat. So they decided to just not cool one part of the building, to be able to keep cooling the other part .. It is now interesting who was in which part ;)

Based on the little information provided the AC can't keep up. So they cut off the lower half of the building to provide better cooling to the other half

The article indicates they were unable to handle the increased electricity load, which caused blackouts.

Additionally, sometimes unnaturally high temperatures break AC systems put in place with poor planning. This is very common in UK supermarkets every summer.

Seems like power shortages:

>”The European Parliament has also faced blackouts this week due to energy consumption from cranking up its cooling system.”