Bolivia's maximum power demand hit a record 1,295 MW on October 16, breaking the previous mark of 1,284 MW the day before.
National dispatch committee CNDC also reported that system reserves during the hour of maximum demand (7:30 p.m.) last Thursday were zero.
Electricity consumption has spiked in recent weeks due to high temperatures.
A state of emergency may be declared for Santa Cruz department due to the heat wave, state news agency ABI quoted emergency operations center (COE) director Enrique Brunn as saying.
CNDC also released September metrics revealing that consumption last month totaled 658 GWh, up 13 percent compared with September 2013.
Gross generation this September totaled 689 GWh, of which 76.4 percent was thermal power generation, 23.5 percent hydro and the remainder wind energy. A year earlier, thermo represented 70.2 percent of the 609 GWh generated and hydro the balance.
Generation capacity last month was 1,104 MW thermo and 476 MW hydro compared with 954 MW and 476 MW in September 2013. Last month, thermo and hydro facilities ran at 90.3 percent and 83.9 percent, respectively.
The top three September generators were Egsa (178 GWh), EVH (136 GWh) and Ende Andina (127 GWh).
In other Bolivia news, a high level Russian delegation arrived to discuss nuclear energy after President Vladimir Putin offered his Bolivian counterpart Evo Morales help earlier this year.