Fonte: ANEELThe Brazilian Electricity Regulatory Agency (Aneel) submits the proposal to update Risk Aversion Curves (CAR) for the Southeast/Midwest, South, Northeast and North subsystems for 2009/2010 to public consultation. It stems from studies elaborated by the National Electric System Operator (ONS). Documentation is available at Audiências/Consultas/Fórum on the Agency’s home page (www.aneel.gov.br). The period for sending contributions in writing begins this Wednesday (12/3) and finishes December 11.

The Risk Aversion Curve is a mechanism that establishes a minimum level of hydroelectric plant reservoir storage needed to safely produce energy for the National Interconnected System. Instituted by Resolution no. 109, by the Electric Energy Crisis Management Chamber (GCE), in January 2002, it works as a sign of eventual power supply risks caused by changes in hydroelectric reservoir storage volume.

According to the proposal, the CAR for the next biennial establishes the minimum level of storage at 38% for the beginning of January for the reservoirs in the Southeast / Midwest subsystem. At its peak, set for April and May – end of the wet season – the Curve reaches 59%. In November, it reaches the lowest level at 29%. For 2010, the indexes will vary between 10% in November and December, and 47% in March and April.

For the South subsystem, the curve for 2009 will range between 13% in May and September and 22% in November and December. In 2010, the peak will be 20% in January and February and the lowest point will be 13% from May to December.

For the Northeast subsystem, storage needed for 2009 will vary from the minimum of 11% in January to a maximum of 51% in April. Storage levels in 2010 will vary from 48% in March and April, to 10% in November and December.

In the North region the ONS proposes the curves for 2009 (from 86% to 15%) and 2010 (83% and 15%) to be used only from June to December, during the dry season. However, Aneel’s proposal is to not use curves for this subsystem since the benefit has not been duly characterized.

^{The proposals are detailed in ONS technical notes 128/2008 (Southeast/Midwest regions); 129/2008 (South region); 130/2008 (Northeast region); 131/2008 (North region) and in Aneel’s technical note no. 087/2008.}

^{Parties interested in participating in the hearing process may only send written contributions to: cp025_2008@aneel.gov.br; by fax (61) 2192-8839, or by mail to the following address: SGAN – Quadra 8839 – Módulo I – Térreo/Protocolo Geral da Aneel – CEP 603 – Brasília-DF – CEP 70.830-030.}