ðə kɹˈʌks ʌvðə pɹˈɑːbləm ɪn dɪzˈaɪnɪŋ ɐ pˈaʊɚ ɡɹˈɪd ɪz ðæt ðɛɹˌɑːɹ mˈɛni ʌnnˈoʊnz ʌntˈɪl ðə vˈɛɹi ˈɛnd ʌvðə dɪzˈaɪn sˈaɪkəl.
The crux of the problem in designing a power grid is that there are many unknowns until the very end of the design cycle.