  This paper exploits the Duration-of-Use of the demand patterns as a key
concept for dealing with demand side flexibility. Starting from the
consideration that fine-grained energy metering is not used at the point of
supply of the electricity consumers, i.e., the granularity of the energy
measured (at time steps of 15 minutes, 30 minutes or one hour), the event-based
energy metering (EDM) is indicated as a viable option to provides a very
detailed reconstruction of the demand patterns. The use of EDM enables
high-quality tracking of the demand peaks with a reduced number of data with
respect to the ones needed to measure energy at regular time steps for reaching
a similar peak tracking capability. From the EDM outcomes, a new class of
options for setting up tariffs or contracts for flexibility, based on the
demand duration curve, is envisioned.
