In electricity transmission networks, energy storage systems (ESS) provide ameans of upgrade deferral by smoothing supply and matching demand. We develop amixed integer programming (MIP) extension to the transmission network expansionplanning (TEP) problem that considers the installation and operation of ESS aswell as additional circuits. The model is demonstrated on the well knownGarver's 6-bus and IEEE 25-bus test circuits for two 24 hour operatingscenarios; a short peak, and a long peak. We show optimal location and capacityof storage is sensitive not only to cost, but also variability of demand in thenetwork.
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