Because computers are great for productivity, and automating these systems made them more profitable. Utilities are deeply regulated, and regulators want to hold rates as low as possible. Nobody gets punished when there is a cyber attack, so it’s not something either the company or its regulators want to spend customers money on. People were outraged in CA when the electric company wanted more money for upgrades so that it wouldn’t burn down as many towns. They didn’t get the rate increases, so now they turn the power off in times of high fire danger.
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