Measures to improve energy efficiency include car fuel economy standards, lighting technologies and building standards.
Despite progress last year, global energy efficiency needs to improve by at least 2.6 percent a year to put the world on track to meet targets to move away from fossil fuels, the report added.
Countries are under pressure to improve energy efficiency as part of a global agreement to limit global warming which will formally come into effect on Nov. 4.
The more efficient use of energy was more than the 1.5 percent gain made in 2014 and was triple the annual average rate between 2003 and 2013, the IEA said.
Last year, oil prices weakened substantially. In the United States, the retail price of gasoline fell by 38 percent and inefficient light-duty truck sales reached an all time high of 9.5 million vehicles, the IEA said.
However, fuel economy standards meant that these vehicles were 9 percent more efficient than in 2010. Globally, car fuel economy standards saved 2.3 million barrels a day of oil last year, or 2.5 percent of global oil supply, it added.
Energy intensity improvements were most marked in rapidly developing countries such as China where it rose by 5.6 percent last year, up from an annual rate of 3.5 percent over the previous decade.
Read more at World Got Cannier at Using Energy Last Year: IEA
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