ˈɛnɚdʒi nɔːɹθwˈɛst fˈɔːɹmɚli wˈɑːʃɪŋtən pˈʌblɪk pˈaʊɚ səplˈaɪ sˈɪstəm ɪz ɐ pˈʌblɪk pˈaʊɚ dʒˈɔɪnt ˈɑːpɚɹˌeɪɾɪŋ ˈeɪdʒənsi ɪnðə nɔːɹθwˈɛst juːnˈaɪɾᵻd stˈeɪts, fˈɔːɹmd ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən baɪ wˈɑːʃɪŋtən stˈeɪt lˈɔː tə pɹədˈuːs ætkˈɔst pˈaʊɚ fɔːɹ nɔːɹθwˈɛst juːtˈɪlᵻɾiz.
Energy Northwest (formerly Washington Public Power Supply System) is a public power joint operating agency in the northwest United States, formed  in 1957 by Washington state law to produce at-cost power for Northwest utilities.