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Latest Impact Factor figures from Elsevier's Energy Journals

We are delighted to inform you that the 2011 Impact Factor figures show, once again, a strong performance for almost all of Elsevier's Energy journals.

Thanks to the contributions of our authors, reviewers and editors, we publish 13 out of the top 20 journals in terms of Impact Factors, and 18 out of the top 20 journals in terms of total cites, with the Journal of Power Sources, Bioresource Technology and the International Journal of Hydrogen Energy ranking 1st, 2nd and 3rd respectively.

Further highlights from this year’s Impact Factors include significant increases for Progress in Energy and Combustion Science (+ 37%), Applied Energy (+31%), Renewable and Sustainable Energy Reviews (+31%), and the International Journal of Greenhouse Gas Control (+25%).

Also noteworthy are Energy for Sustainable Development and Utilities Policy, both receiving their first Impact Factors of 1.625 and 0.804 respectively.

Further highlights include:

journal cover imageProgress in Energy and Combustion Science
2010 Impact Factor
WAS
10.362
2011 Impact Factor
NOW
14.220
impact factor bar-chart
journal cover imageRenewable and Sustainable Energy Reviews
2010 Impact Factor
WAS
4.567
2011 Impact Factor
NOW
6.018
impact factor bar-chart
journal cover imageInternational Journal of Greenhouse Gas Control
2010 Impact Factor
WAS
4.074
2011 Impact Factor
NOW
5.111
impact factor bar-chart
journal cover imageApplied Energy
2010 Impact Factor
WAS
3.888
2011 Impact Factor
NOW
5.106
impact factor bar-chart

Calculating Impact Factors

WHAT IS AN IMPACT FACTOR?
The journal impact factor is a measure of the frequency with which the average article in a journal has been cited in a particular year. The impact factor helps you evaluate a journal's relative importance, especially when you compare it to others in the same field. The impact factor is calculated by dividing the number of citations in the current year to items published in the two previous years by the total number of items published in the two previous years.

Using Journal X as an example:
Cites in 2011 to items published in: 2010
2009
Sum
= 258
= 199
= 457
Number of items published in: 2010
2009
Sum
= 116
= 71
= 187
Calculation: Cites to recent items 457 = 2.444
Number of recent items 187

The 2011 Impact Factor for Journal X is 2.444

Journal Performance Measurements

Journal performance measurements offer a systematic, objective means to critically evaluate journals, and several indicators are available.

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