In January 2006:
Four explosions on Russia's side of the border created the shortages, Georgian and Russian officials said. The first two occurred at roughly the same time, before sunrise, severing both the main and reserve gas pipelines that flow into Georgia from the Russian supply network.
Later in the morning, two more explosions destroyed a power transmission cable in two places.
Georgia's deputy energy minister, Aleko Khetaguri, said in a telephone interview that as a result of the explosions, Georgia had lost all gas flow and roughly a quarter of its electricity, including electricity that was generated from domestic turbines powered by Russian gas.
Russian officials initially said the explosions appeared accidental but later announced that a criminal investigation had been opened and that the blasts were acts of sabotage, perhaps by insurgents in the region using makeshift bombs. [...]
No insurgent group took immediate responsibility for sabotage, and Mr. Saakashvili noted that none of the guerrilla or terrorist bands in the region, which often act in coordination with Islamic separatists in nearby Chechnya, had threatened Georgia.
As far as the international press goes, this story seems to have died soon thereafter. There's hardly anything else in Wikipedia on it.
So, did Russia publish some kind of final report on those acts of sabotage? Were there any indictments or trials? Was Georgia [eventually] convinced by the evidence presented by the Russian authorities?