The measure makes Tennessee the first US state that would mandate the electric chair, although the Death Penalty Information Center (DPIC) says six other states that allow inmates to choose their method of execution allow such electrocution.
In late April, the prolonged and agonising death of an Oklahoma inmate who had been administered execution drugs highlighted the debate over the injections.
President Barack Obama called the incident "deeply troubling."
US states have scrambled to address a persistent shortage of the substances used in the deadly formulas.
In some cases they have been forced to change their procedures or turn to controversial pharmacists, whose drugs have not been approved by federal authorities.
The Tennessee bill was signed into law yesterday by Republican Governor Bill Haslam and reported today by the DPIC.
It calls for executions to be carried out by lethal injection unless such methods are "held to be unconstitutional" or if the corrections commission certifies that one or more of the necessary ingredients "is unavailable through no fault of the department."
Several other states are considering adopting similar measures, while legislators in Wyoming are mulling a return to the firing squad.
"Defense attorney David Raybin, who helped draft Tennessee's death penalty law in the 1970s, said that changing the execution method retroactively would be unconstitutional," the DPIC said.
Inmates could challenge electrocution under the Constitution's ban on cruel and unusual punishment.
"Executions by electric chair have resulted in inmates bleeding and catching fire, and some have required multiple jolts of electricity before death occurred," the center noted.
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