We analyze the energetics of the major radio flare of October 8 2005 in GRS 1915+105 .
The flare is of particular interest because it is one of the most luminous and energetic radio flares from a Galactic black hole that has ever been observed .
The motivation is two-fold .
One , to learn more about the energetics of this most extreme phenomenon and its relationship to the accretion state .
The second is to verify if the calibrated estimates of the energy of major radio flares ( based on the peak low frequency optically thin flux ) derived from flares in the period 1996-2001 in Punsly & Rodriguez ( 2013 ) , PR13 hereafter , can be used to estimate plasmoid energy beyond this time period .
We find evidence that the calibrated curves are still accurate for this strong flare .
Furthermore , the physically important findings of PR13 are supported by the inclusion of this flare : the flare energy is correlated with both the intrinsic bolometric X-ray luminosity , L _ { \mathrm { bol } } , \sim 1 hour before ejection and L _ { \mathrm { bol } } averaged over the duration of the ejection of the plasmoid and L _ { \mathrm { bol } } is highly elevated relative to historic levels just before and during the ejection episode .
A search of the data archives reveal that only the October 8 2005 flare and those in PR13 have adequate data sampling to allow estimates of both the energy of the flare and the X-ray luminosity before and during flare launch .