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The Justice Department approved Sirius Satellite Radio’s $5 billion buyout of rival XM Satellite Radio on Monday, saying the deal was unlikely to hurt competition or consumers.

The deal was approved despite opposition from consumer groups and an intense lobbying campaign by the land-based radio industry.

Sources say the merger will save hundreds of millions of dollars in operating costs—savings that will ultimately benefit their customers.

XM Satellite shares rose $1.97, or 16.5 percent, to $13.90 in afternoon trading after the government’s announcement while Sirius shares rose 28 cents, or almost 10 percent, to $3.18.