Energies
The chakras work with the energy that is the raw material for
emotional states… Prana is the energy connected with breathing
and hence with vitality… Kundalini is the main energy that
fuels the chakra system. It is connected with sexual energy, but
it is sexual energy only when operating in the lower chakras.
In the heart chakra it is experienced as love; in the head chakras
it is experienced as light. Shakti is the same energy but in a
different form, that of power. It is experienced as having more
of an electrical quality than kundalini. (Essence, pg 39)

Energies of the Chakras
The energies of the chakras are the basic raw energies of emotional
states. When a chakra is active or “open,” we directly
experience the basic subtle energies that go into the makeup of
the various emotions, instead of the emotions themselves. That
is why we experience emotional freedom when the heart opens: the
energy frees us, for the moment, from the conflicting emotions
that usually fill our hearts. The basic energy of the heart chakra
is experienced as love, joy and bliss. (Essence, pg 28)

Essence and energy
Essence is something fundamentally different, more substantial
and deeper than energy, whether it is electromagnetic, chemical,
chi, prana, kundalini, shakti, libido, orgone or whatever. However
all these energies must be experienced and freed for a person
to move into the realm of being, our essential and true nature.
(Essence, pg 39)