The PGE meters don't transmit only 45 sec per day That is an average.
From WirelessMess.org (and this same info can be found in the Administrative Law Judge's transcript of the hearing): When they say the meter only emits “45 seconds per day” they don’t tell you that means 15,000 pulses.
To record these increments data is transmitted multiple times, every minute, 24 hours a day. If you ask PG&E they will most likely tell you that data is only transmitted six times a day. However PG&E was forced to admit to Administrative Law Judge Yip-Kikugawa that their meters were much stronger than advertised to the public, and each electrical meter puts out bursts of microwave radiation from 9,600 to 190,000 times a day.
The electric meters operate continuously, sending out quick bursts of radiation lasting milliseconds. Considering these bursts are sent out several times a minute, they add up to thousands of bursts all day long.
Utilities use time-averaging to report the meters' power.