In science fiction, even if a ship has shields that can shrug off atomic weapons, ramming it with another ship always manages to take it down. The impact of a heavy freight train going 60 mph is equal to that of 1 to 2 tons of TNT — it's just over a much smaller area, and going in one direction.
Most spaceships are far heavier, and can go far faster.
At realistic space combat distances (hundreds if not thousands of kilometers), the target should have plenty of time to see the attempt coming and either blow up the ramming ship or dodge out of its way.
Look at how far gone South Australia is: The red bars are the reserve shortfalls predicted to occur in summer next year and the year after.
In itself, that doesn’t mean there will be blackouts but it means that SA is likely to be completely dependent on the interconnector to the coal plants in Victoria and the risk of blackouts is higher. The renewables fans must be hoping for a minor La Nina here over summer, so the temperatures are not so high and the air conditioners in Adelaide won’t be pumping, and so the hydro dams may fill.
According to the Australian Energy Market Operator back in 2012-13 we had 20 per cent “reserve capacity”— power generation capacity above maximum demand.
Currently that’s down to 12 per cent and if the Liddell power station is shut there will be a big shortfall.
Survivors are not unknown, and the effect is usually depicted as "Ship A crashes into ship B and ship B crumples and breaks apart in slow motion," where it should look like, and is only rarely is portrayed as, "Ship A crashes into ship B and both ships are vaporized in a titanic fireball".