Electroid varieties and a compactification of the space of electrical networks

We construct a compactification of the space of circular planar electrical networks studied by Curtis-Ingerman-Morrow [4] and Colin de Verdière-Gitler-Vertigan [3], using cactus networks. We embed this compactification as a linear slice of the totally nonnegative Grassmannian, and relate Kenyon and Wilson's grove measurements to Postnikov's boundary measurements. Intersections of the slice with the positroid stratification leads to a class of electroid varieties, indexed by matchings. The uncrossing partial order on matchings arising from electrical networks is shown to be dual to a subposet of affine Bruhat order. The analogues of matroids in this setting are certain distinguished collections of non-crossing partitions.