Strategic conservation in lighting and water heating - a case-study

A. Gomes Martins, A. Gomes

FCTUC, INESC Coimbra Coimbra, Portugal,,

F. Pinto de Carvalho, P. Julião

EDP Distribuição, Coimbra, Portugal,

J. Gonçalves

Inst. Politécnico de Coimbra, INESC Coimbra, Coimbra, Portugal,





In the context of an assessment study on the feasibility of postponing investment in new capacity of an urban electricity distribution substation through demand-side management, a pilot-action has been conducted in the city of Coimbra, Portugal. This pilot-action consisted of direct replacement of lighting equipment at several consumers premises. Adequate electricity consumption monitoring has been made, both before and after replacements took place, in order to assess the effects.

Several restrictions, namely regarding investment, applied to this initiative. The conclusions, however, should be enough to characterize the possibilities of load shape modifications, namely through strategic conservation and valley filling (along with load shifting) objectives. An extensive load research effort carried out during the year preceding the pilot experiment has been an important background to this initiative.

For the first time in the city of Coimbra, DSM has been implemented through direct installation of energy efficient equipment by the utility in consumers premises, providing valuable information not only about the actual effects of the replacements but also on the problems and difficulties associated with this implementation method (due to barriers either on the consumer side or on the utility side) and with the respective monitoring of results. As regards to the physical impact of replacements, they showed to be potentially very effective in view of the utility's load shape objectives at the target substation level (demand limiting and valley filling/load shifting), mainly through energy efficiency improvement.