The attacks have prompted a flurry of calls to better protect the nation's power grid, but experts have warned for more than three decades that stepped-up protection was needed.- In Florida: Six "intrusion events" occurred at Duke Energy substations in September, resulting in at least one brief power outage, according to the News Nation television network, which cited a report the utility sent to the Energy Department.- In Oregon and Washington state: Substations were attacked at least six times in November and December, with firearms used in some cases, local news outlets reported.In January, the Department of Homeland Security said domestic extremists had been developing "credible, specific plans" since at least 2020 and would continue to "encourage physical attacks against electrical infrastructure."In a news release, Timothy Langan, assistant director of the FBI's Counterterrorism Division, said the defendants "wanted to attack regional power substations and expected the damage would lead to economic distress and civil unrest.""