Total power generation in the month rose just 0.
6 percent to 987 GigaWatt hours (millions of units of electricity) from a year earlier.
In December total generation fell in absolute terms by one percent to 988GWh amid a slowing economy and higher tariffs which promote conservation.
In 2012 total generation grew just 2.
4 percent to 11,807GWh as the economy slowed, with some power cuts also reducing generation, as a large coal plant broke down repeatedly.
This year the CEB is expecting to sell 10,950GWh of energy. Sales could be lower than generation due to system losses.
Data released by the Central Bank shows CEB's hydro power generation grew 270 percent to 593GWh in January 2013 from a year earlier, while purchases from private power producers plunged 60 percent to 214GWh.
CEB's own thermal generation - which includes coal power - was also down 21 percent to 234GWh.
CEB has sought a price hike from April.
The regulator removed three thermal plants whose power purchase