Colonial âransomwareâ attack shows cyber frailty of US energy grid Will Englund, Taylor Telford and Ellen Nakashima Updated Save Share Washington | A major fuel pipeline that was shut down after a brazen cyberattack will probably come back online by weekâs end, officials said on Monday (Tuesday AEST), as security experts warned the nation must take more seriously persistent vulnerabilities in Americaâs ageing energy infrastructure. The Colonial Pipeline running from Houston to New Jersey, supplying the east coast with 45 per cent of its fuel, was taken offline on Friday (Saturday AEST) after a hacker group known as DarkSide threatened to expose private data unless the Georgia-based company paid a fee - known as a âransomwareâ attack.