Grid defection occurs when customers disconnect from the utility grid entirely by installing off-grid solar and battery systems, eliminating monthly electricity bills and utility dependence. While grid defection remains rare, affecting fewer than 1 percent of U.S. residential customers, the trend concerns utilities as it reduces their customer base and operational revenue. Grid defection is most common in regions with high electricity rates, poor solar incentives, and unreliable grid service.
Economic and Technical Drivers
Grid defection becomes economically attractive when electricity rates exceed $0.20 per kilowatt-hour and battery costs drop below $150 per kilowatt-hour. States like Hawaii, where rates exceed $0.35 per kilowatt-hour, have experienced grid defection rates above 5 percent in certain markets. However, total off-grid system costs of $40,000 to $80,000 remain prohibitive for most customers. Grid defection requires larger solar arrays and battery banks to handle seasonal variations, increasing system complexity and maintenance requirements.
Utility and Policy Implications
Grid defection reduces utility revenues for infrastructure maintenance and creates cost-shifting burdens on remaining customers. Some utilities have responded by increasing fixed monthly charges or implementing solar export fees. Hawaii and Arizona implemented anti-defection policies, though most states have not. Well-designed rate structures and solar incentives can prevent economically inefficient grid defection while supporting distributed energy resources.