Google Fiber plans to add more than 500,000 customers by 2021, up from its current average of just under 50,000 per year, the Wall Street Journal reported Wednesday.

The company is looking to add between 1 million and 1.5 million new users per year and expects to add as many as 600,000 in total over the next decade.

The company is in the midst of adding its own fiber optic network, but has not yet identified a target for that network.

The Journal reported that Google Fiber, which has about 300,000 fiber-optic lines installed in about 40 U.S. cities, is “pushing ahead with plans to build out its fiber network and increase its revenue.”

The company recently completed a $600 million acquisition of the wireless company T-Mobile US for $39.5 billion.

The deal, which includes a $200 million incentive package, was approved by a federal judge in New York on Monday.

Google Fiber has been investing in infrastructure to expand its network, according to the Journal.

The Wall Street Report said that Google is “looking to build on existing infrastructure and build out new ones” to grow its business.

It said Google Fiber has signed deals with wireless carriers in Chicago and Austin, Texas, to expand fiber-based phone service.

Google is in talks with Sprint, which recently announced it will build out fiber to all of its home customers, including its Austin, Houston, Dallas, Denver and Austin markets.