My understanding is that there are five separate grids which are not frequency synchronized, as described here:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Eastern_Interconnection" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Eastern_Interconnection</a><p>They are connected, but with DC or other techniques that don&#x27;t require matching phase.<p>Not so?