  Electricity supply is not simply a matter of quantity, but a time lasting
service that matches with a wave-like load curve. It logically deserves a
pricing based on the curve per se rather than simply integral of load. This
paper introduces to price electricity consumption based on dynamism of load,
which is an equivalent characterization of load. Orthonormal basis with
definable and distinguishable periodicity that can linearly express load curves
constitutes a space to capture the dynamism, where coefficients of the basis
quantify the dynamism in multiple dimensions. A price function is proposed to
map the coefficients to a numerical charge. A pricing model on the space
specialized by the Fourier series is derived for the simplest
one-source-one-subscriber system and generalized to a single-bus system with
multiple sources and multiple subscribers. Examples will demonstrate the use of
the proposed pricing and its effectiveness in reflecting the cost of generation
to cope with load dynamism and guaranteeing fairness.
