is given
as
A shunt connected element such as a capacitor or inductor is modeled as a fixed
impedance to ground at a bus. The admittance of the shunt element at bus is given
as
 | (3.7) |
and 
denotes the 
vector of shunt admittances at all
buses. The parameters 
and 
are specified in columns GS (5) and BS
(6), respectively, of row 
of the bus matrix as equivalent MW (consumed)
and MVAr (injected) at a nominal voltage magnitude of 1.0 p.u and angle of
zero.
A shunt element can also be used to model a constant impedance load and, though correctly, Matpower does not currently report these quantities as “load”.