“ but it seems that in many cases, the gas supply failed due to freezing
issues at the wellhead. “
Speculating, but It might have actually made sense to use some locally
generated (near the wellhead) power to help keep those wellheads from
freezing. (Along with some decent covers.) A good sized battery bank
could keep a well insulated 12 volt electric blanket running above
freezing for a week.
Keep that charged with wind or solar (or a natural gas electric generator!)
and only heat as needed. Monitor your well, and maybe come recharge
the batteries with a backup generator when nothing else works.
Perhaps this company can upgrade their new covers to low voltage
electric blanket versions.
~Easy
Up in Alaska we plugged in our vehicle when parked to not only keep the block from freezing, but to keep the battery blanket warm. The colder the battery is, the lower the output. So battery blankets to keep the well head warm is not a good solution.