Electricity competitiveness improvement through energy storage.

A simulation based case-study

A. Gomes, H. Jorge

FCTUC, INESC Coimbra Coimbra, Portugal, agomes@dee.uc.pt, hjorge@ dee.uc.pt

D. Coelho

ISEC - Instituto Politécnico de Coimbra, INESC Coimbra Coimbra, Portugal, dcoelho@sun.isec.pt





The paper deals with the improvement of competitiveness in electricity use in the residential sector taking advantage of thermal energy storage through load control of domestic electric water heaters and presents a simulation based case-study.

Load control of electric water heaters, associated with the promotion of time-of-use (TOU) tariffs for the domestic sector, aims to reduce simultaneously peak system demand and the customer’s electricity bill. By moving loads from peak demand periods to off-peak periods without significantly altering energy service usage (minimising an eventual discomfort to the end-user), control of electric water heaters implements one of the six generic Demand-Side Management (DSM) objectives - load shifting.

For the simulation scenarios referred to - the present situation (without energy storage) and the new situation (with energy storage) - a software tool reproducing the behaviour of electric water heating devices has been used to assess the effects of thermal energy storage with electric water heaters on utility load diagrams and the consumer’s electricity bill.

The data used for the simulation scenarios have been collected through an extended questionnaire directed at the residential consumers. Additionally, global load diagrams of each dwelling and load diagrams from various end-use equipment have been obtained through automatic data acquisition systems.