In 2009, 125 transmission contracts and 270 additional terms were signed. Amongst the events that led to the conclusion of these instruments, the following should be included: the transmission auctions promoted by ANEEL in 2008; the integration of the Acre / Rondonia system to the BIPS, the annual re-contracting of energy by the distribution utilities; the revision of the permitted annual revenue of the transmission utilities; and the application of ANEEL Resolution No. 349/2009, which introduced the TUSDg.