The Rowan

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The Rowan is the first book in "The Tower and the Hive" series by Anne McCaffrey. It is set in the universe of the "Pegasus" trilogy, against a backdrop of a technologically advanced society in which telepathy, psychokinesis and other psychic Talents have become scientifically accepted and researched. Telekinetic and telepathic powers are used to communicate and teleport spaceships through space, thus avoiding the light barrier and allowing for the colonization of other solar systems.
In the series, psionic powers occur of varying strength, the possessors being ranked from T12 to T1. The very strongest are employed as "T1 Primes" by an independent company, FT&T, for teleporting cargo and passengers between the systems.