Google believes it is on
course to have enough internet-beaming balloons in the stratosphere to
form a ring over part of the world next year.
It told the BBC the move would let it trial a continuous data service to people living below the balloons' path.
The
declaration coincides with the announcement that three of Indonesia's
mobile networks intend to start testing Project Loon's transmissions
next year.
The advantage of a balloon-based system over satellites
is that it should ultimately be cheaper to maintain - at least, if all
the technological challenges can be overcome.
"What may initially
seem like a complex delivery method could end up being a very innovative
solution to a very difficult problem to solve at ground level," Mr
Green added.
Google is, however, considering other options,
It
is also pursuing a separate effort codenamed Titan, which aims to use
solar-panelled drones to provide the internet to unconnected parts of
the world.
Facebook is also developing a similar drone-based scheme.
One expert said the plan had benefits over other solutions.
Sri
Lanka previously signed a separate agreement signalling its wish to be
another participant in the giant helium balloon-based scheme.
4G-like speeds
Google
first revealed its superpressure balloon plan in June 2013, when about
30 of the inflatable plastic "envelopes" were launched from New Zealand.

Beneath each lighter-than-air balloon are hung:
- two radio transceivers to receive and send data streams, plus a third back-up radio
- a flight computer and GPS location tracker
- an
altitude control system, which is used to move the balloon up and down
to find winds that will take it in the desired direction
- solar panels to power all the gear