Grid parity, also called socket parity, is a measurement that
compares the levelized cost of solar electricity with the cost of
residential retail electricity. When grid parity is reached, it
becomes more economical for you to install solar panels on your roof
rather than purchasing power from your utility company.
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• Solar electricity estimates are determined using solar radiation
values for state capitals.
• Solar generation figures are based on an average-sized
residential solar PV system of 5 kW that is operational for 25
• Default installation cost is estimated to be $3/watt (not
including the 30% federal tax credit). This figure is based on an
NREL study published in September 2017.
• Where available,
state-based solar tax credits were also included in the levelized
cost calculations (other incentives, such as performance payments
or property tax exemptions, are not included).
• Utility rates are based on the monthly residential rate data set
as reported by the EIA.
• Utility rates are computed using the last 12 available months in