From a total of 2,442 disturbances verified in 2009, in only 13.0% of them (318) load cuts were verified. However, it is worth noting that only 77 occurrences (3.2% of total) represented shutdowns exceeding 100 MW, which corresponds to the consumption of a city the size of Nova Iguacu, in Rio de Janeiro or Pelotas, in Rio Grande do Sul.

It is worth mentioning that, in accordance with CMSE specific regulations by Resolution 01/2005, ONS, in a joint work with the agents, implemented special operation measures, in order to guarantee the power supply during events of great social importance, especially in the days of Carnival, Christmas and New Year.

The safety in the electric supply achieved in 2009 may be translated by the performance indicators of the BIPS. The indicator of robustness is a good example of this result, because in 96.8% of the disturbances, the load cuts were recorded below 100 MW. These indicators have remained in the same levels of previous years, even considering the growth of the transmission grid.