pˈaʊɚ ɡɹˈɪd pɹˈɑːbləmz ɹᵻvˈiːld æt ðɪs stˈeɪdʒ ɑːɹ jˈuːʒuːəli vˈɛɹi dˈɪfɪkəlt ɔːɹ ɛkspˈɛnsɪv tə fˈɪks, sˌoʊ ðə pɹɪfˈɜːd mˌɛθədˈɑːlədʒiz hˈɛlp tə dɪzˈaɪn ɐn ɪnˈɪʃəl pˈaʊɚ ɡɹˈɪd ænd ɹᵻfˈaɪn ɪt pɹəɡɹˈɛsɪvli æt vˈɛɹiəs dɪzˈaɪn stˈeɪdʒᵻz.
Power grid problems revealed at this stage are usually very difficult or expensive to fix, so the preferred methodologies help to design an initial power grid and refine it progressively at various design stages.