ˌɔn dʒˈænjuːˌɛɹi θˈɜːɾi wˈʌn, nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən, ðə stˈeɪt lˈɛdʒɪslətʃɚ kɹiːˈeɪɾᵻd ðə wˈɑːʃɪŋtən pˈʌblɪk pˈaʊɚ səplˈaɪ sˈɪstəm, nˈaʊ nˈoʊn æz ˈɛnɚdʒi nɔːɹθwˈɛst, æz ɐ dʒˈɔɪnt ˈɑːpɚɹˌeɪɾɪŋ ˈeɪdʒənsi tə ʃˈɛɹ ðə ɹˈɪsks ænd ɹᵻwˈɔːɹdz ʌv bˈɪldɪŋ ænd ˈɑːpɚɹˌeɪɾɪŋ ᵻlˈɛktɹɪkəl dʒˈɛnɚɹˌeɪɾɪŋ fəsˈɪlᵻɾiz.
On January 31, 1957, the state legislature created the Washington Public Power Supply System, now known as Energy Northwest, as a joint operating agency to share the risks and rewards of building and operating electrical generating facilities.