It stars Randolph Mantooth and Robert Beltran (Commander Chakotay from Star Trek Voyager) and was a Sci-Fi (Syfy) TV movie.. The Plasma-fire creature traveled along power lines to begin fires all around. It could travel along anything that would conduct electricity..

Fire serpent is what they also called the Aztec god Xiuhcoatl..

Fire Serpent is a 2007 Sci Fi Channel monster movie directed by John Terlesky.

Plot
A solar flare from the sun sends a serpentine alien composed of fire to Earth where it begins to wreak havoc throughout a small community. During its search for more fuel to consume it stumbles upon a large military oil reserve. It soon becomes clear that an old man may hold the key to destroying it in the form of a Halogen Gun which may be used as a makeshift fire extinguisher of sorts. A small group of citizens decides to use this technology to make a stand against the creature only to face additional resistance from the beast, as well as a government employee (Beltran) who voluntarily helps the snake because he believes it is the spirit of a god.