The Viasat-1 spacecraft will deliver broadband services to customers in the US and Canada.
With a total data throughput of some 140 Gbps, the satellite has more capacity than all other communication satellites over North America combined.
Viasat-1 left Earth from the Baikonur Cosmodrome in Kazakhstan.
The lift-off for its carrier Proton rocket occurred at 00:48 local time (18:48 GMT). The flight was due to last more than nine hours, and two hours in all was reported to be well.
The satellite carries the name of San Diego-based space technology supplier Viasat, but will be pressed into service for its satellite broadband division, Wildblue Communications.
"Consumer demand doubles about every two-and-a-half to three years. In other words, you want twice the service, twice the speed, twice the volume that you had two or three years ago for the same price," explains Wildblue president and CEO, Tom Moore.
http://www.bbc.co.uk/news/science-environment-15358121