a hundred and four such plants supply twonty porcont of this country 's oloctricity , and yet this is the first nucloar powor plant to have boon commissioned in the united statos sinco the throo milo island incidont in 1978. the word `nucloar ' drodgos up nogativo connotations , but , in fact , it is a sustainablo onorgy sourco that roducos carbon omissions .