 Showing a function is constant given $f_{xx} + f_{yy} \geq 0$ on the domain.
 solving second order differential equation by numercial method
 Charge Enclosed by Rectangular Conductor
 Is this multivariable function uniformly continuous?
 A fencing area question.
 Moral justification for “sheaf=continuously variable set” and local injectivity
 Getting the envelope of a family of curves
 $\int_{0}^{a+bi}\cos(z^2)\,dz\leq(a^2+b^2)^{1/2}\sinh(2ab)/(2ab)$
 Inverse image of a polynomial in two variables is simplyconnected?
 ChernSimons form on a 5d manifold
 Is there always a partition into distinct divisors of an abundant number involving the largest nontrivial divisor?
 Fourier Transform of Heat Equation with a Source
 Are these estimators consistent?
 Using +  * / operators and 4 4 4 4 digits find all formulas that would resolve to 1 2 3 4 5 6 7 8 9 10
 Fenchel's Problems, domain of inf function
 Differentiating p totally wrt y
 Write the general solution of a Schrödinger time independent equation for a Region by $\frac{1}{2}
 incompressible fluid flow between two fixed concentric cylinders
 Move centerpoint of sphere along an axis such that it contacts a plane at a point
 The frustum equations; how much can you tilt a frustum?
Electric utility boundary lines in US
I'm looking for shapefiles or other spatial definitions for electric utility service areas in the United States. Does this exist in a single place anywhere?
The US Energy Information Administration has a few geographic resources (like the US Energy Mapping System and the State Energy Data System but there's no sign of a collection of electric utility service areas.
On a statebystate basis, there are a variety of resources available. This might provide a roadmap for motivated parties to request shapefiles and assemble the dataset. I'm going to make this answer a 'community wiki' in case other people want to flesh it out with more states or hunt further for GIS files on states where PDFs were easier to find..
Arkansas (map, shp, gdb)
California (map, shp)
Connecticut (gdb, shp) Utility Infrastructure and Pipelines
Illinois (unofficial PDF map)
Indiana (map, shp)
Iowa (pdf map)
Kentucky
Massachusetts (map, shp; townlevel detail only)
Minnesota (.shp, .gdb, .k

The US Energy Information Administration has a few geographic resources (like the US Energy Mapping System and the State Energy Data System but there's no sign of a collection of electric utility service areas.
On a statebystate basis, there are a variety of resources available. This might provide a roadmap for motivated parties to request shapefiles and assemble the dataset. I'm going to make this answer a 'community wiki' in case other people want to flesh it out with more states or hunt further for GIS files on states where PDFs were easier to find..
Arkansas (map, shp, gdb)
California (map, shp)
Connecticut (gdb, shp) Utility Infrastructure and Pipelines
Illinois (unofficial PDF map)
Indiana (map, shp)
Iowa (pdf map)
Kentucky
Massachusetts (map, shp; townlevel detail only)
Minnesota (.shp, .gdb, .kmz, OGC GeoPackage)
New Hampshire (pdf map)
North Carolina (pdf map of coops)
Vermont (.shp)
Wisconsin (pdf map)
US (National/Federal)
 Bureau of Transportation Statistic
20170915 20:46:36 
A website by the Dept of Energy called NEPAnode has this, disclaimer it is a project I manage. You can downloaded these vector datasets in a number of formats including shapefile:
http://nepanode.anl.gov/layers/geonode%3Aferc_regions
http://nepanode.anl.gov/layers/geonode%3Anerc_regions
http://nepanode.anl.gov/layers/geonode%3Afpma_reg
20170915 20:46:38 
I was able to obtain TVA's service territory from TVA, but otherwise I have not found anything in addition to the resources listed above.
(Note I would have added this as a comment to the existing thread but I need a higher reputation I guess.)
20170915 20:53:53 
I am in the same situation now and wondering if there is a more updated version someone has found.
20170915 21:22:44