Energy hungry infrastructure projects pay something called a "large-load tariff" to try to contain their second-order costs from leaking into residential rate payers pay for. It's not perfect, so a datacenter project could trigger some upgrades that cause rates to go up.
The situation is confusing everyone right now because it's impossible for the average person to tell why rates are going up. A lot of utilities are doing things like finally addressing old fire-prone infrastructure (see the California fires) and dealing with inflation for everything from their generation input costs to inflated costs for infrastructure to putting straight of Hormuz-inflated gas in the tanks of their fleet. Customers only see that their rates are going up and AI datacenters are on the news, so they put them together and assume datacenters are to blame for everything. Yet rates are spiking even in places with zero datacenters.
The topic has entered the domain of emotionally charged topics so nuance is hard to come by. Many of the anti-datacenter people are against datacenters as a proxy for their hatred of AI and the electricity and water arguments are just convenient justifications. This is how we arrive at the article.
The energy grid is largely interconnected in the US. Just because there arent any datacenters in your state doesnt mean anything because the ones in the next state over could be on the same grid. End of the day prices are about supply and demand, same as always. When a huge amount of demand is added and supply is unchanged prices will go up.