DOL (hoʻomaka pololei) ʻoi loa ka maikaʻi loa ʻekolu-phase magnet synchronous motor no nā mea hui i ka ʻoihana kemika.

Ma hope o ʻelua mau makahiki o ka hoʻohana maoli ʻana, ʻo 11.5% ka helu mālama mana.