The Federal Communications Commission voted 3-2 yesterday to approve the plan, which revamps a program originally designed for telephone service that offers some USD 9 a month.
The FCC proposed the plan earlier this month to revise the "Lifeline" program from the 1980s, saying broadband access is essential for "full participation" in modern society.
Consumer organisations welcomed the FCC action.
"Lifeline has helped people who otherwise could not afford to obtain vital telecommunications services. Today's vote extends the program's monthly subsidy to at least partially cover broadband service in qualifying households," said Michael Copps, a former FCC commissioner who now advises the activist group Common Cause.
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But the libertarian group TechFreedom said the FCC has not demonstrated it will curb fraud and abuse of the subsidy program.
TechFreedom president Berin Szoka said the program's funding from a tax on telecom services merely shifts the burden to middle-class families.
The FCC said the new plan establishes minimum standards for broadband and also will use a third party to verify eligibility in an effort to curb fraud.
It also aims to encourage a new category of "Lifeline" service providers with a streamlined entry procedure into new markets.
A separate action by the FCC calls for new privacy regulations to ensure consumers are aware of how much data is being collected on them by their Internet service providers.