HOMER Knowledge Base

HOMER Knowledge Base

The ITC tax credit is not working for storage in HOMER Grid?

The ITC only applies to storage per NREL guidelines (75% or more of the energy stored in the battery must have come from renewables). If the ITC credit is not shown on the Cash Summary tab of the Simulation Results window, the storage is not being charged at least 75% of the time by renewable sources. One workaround to this would be to force the battery to be charged by renewables, PV for example, by setting the PV and battery to the DC electric bus and setting the Rectifier Relative Capacity value to 0%. Alternatively, you can use a capital-based incentive to encourage the battery to be charged by the PV.