Get ready lads...For 4g masts the number that have emergency power is quite 'shocking' ! This is from a 2019 ofcom report,
"Both EE and Three have 6 hours or more of
back-up power at around 3% of their sites. EE
has a further 4% of sites which can continue
operating for five days or more during a
power cut. The vast majority have no back-up
power"
"Of the sites which Vodafone
provides, which broadly speaking cover the
west of England and Wales, around half have
four hours of back-up power. The remaining
Vodafone sites have between 1 and 2 hours.
O2 protects its hub sites, which account for
about 5% of its total sites, with 4 hours of
back-up power. Most of its remaining sites
have no protection, with an unspecified
number of larger coverage sites having 10
minutes."
Those numbers are really quite grim.
We're gonna have to talk to her for 3 hours