As a result of electricity blackouts in major Bolivian cities. The government has determined to implemented day-light savings for the summer time, September 11, 2011 to March 18, 2012 (see El Deber link below, in its first part the article mentions dates as being 9/1/2011 to 3/31/2012).

There are mixed opinions: some energy experts say it will not address the problem, as it is needed at least 150 to 200 MW more over the medium run. This intended measure will mean people have to adjust their clocks for one hour ahead, current 6:00 am will mean 5:00 am starting in September 1st, it is expected that this measure will continue from this year on.

Entrepreneurs agree with this measure but say it will only mean a 20 to 30 MW of daily savings. Most of the industrial sector will only save on lights but their equipment will still operate. Workers say this will not solve the problem and are analyzing this time shift. This savings represents only 2.85% of the daily demand.

http://www.eldeber.com.bo/2011/2011-08-23/vernotaeconomia.php?id=110822210405

It is worth remembering that in the mid 80s Santa Cruz was the only city that tried this and after a year decided to go back, as it did not represent major savings.