E-1 & Ma'ale Adumim

What is E-1? Is it the same as reported plans to expand Ma'ale Adumim?

E-1 is short for "East 1," the administrative name given to the stretch of land northeast of Jerusalem, to the west of the settlement of Ma'ale Adumim. When people talk about E-1 today, they are referring to a longstanding Israeli plan - never implemented - to build a large new Israeli neighborhood in this area.