baɪ dˌuːɪŋ ðiːz tˈuː stˈɛps, ðə pˈaʊɚ ɡɹˈɪd ɐnˈæləsˌɪs pɹˈɑːbləm ɹᵻdˈuːsᵻz tə sˈɑːlvɪŋ ɐ lˈɪnɪɹ nˈɛtwɜːk wˌɪtʃ ɪz stˈɪl kwˈaɪt lˈɑːɹdʒ.
By doing these two steps, the power grid analysis problem reduces to solving a linear network which is still quite large.