Doesn’t seem to be much question: they’re hitting dams (not to destroy the dam, I suspect, to take out the hydropower and the river crossing point) and various other power infrastructure, night after night.
This is something they hadn’t done before: there had been some attacks, but nothing systematic.
This isn’t a new tactic: in the 90s Gulf War, the US took out nineteen of twenty power plants, which led to water treatment and supply issues, which lead to c. one million deaths from cholera. To this day Iraq doesn’t have enough power. They also directly hit water infrastructure, and they used similar tactics in the 2000s Iraq war.