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| Company | Unit | Mar 2010 | Jun 2010 | Sep 2010 | Dec 2010 | Mar 2011 | Jun 2011 | Sep 2011 | Dec 2011 | Mar 2012 | Jun 2012 | Sep 2012 | Dec 2012 | Mar 2013 | Jun 2013 | Sep 2013 | Dec 2013 | Mar 2014 | Jun 2014 | Sep 2014 | Dec 2014 | Mar 2015 | Jun 2015 | Sep 2015 | Dec 2015 | Mar 2016 | Jun 2016 | Sep 2016 | Dec 2016 | Mar 2017 | Jun 2017 | Sep 2017 | Dec 2017 | Mar 2018 | Jun 2018 | Sep 2018 | Dec 2018 | Mar 2019 | Jun 2019 | Sep 2019 |
| CEZ | GWh | 4,975 | 4,772 | 4,929 | 5,035 | 4,407 |
Helgi Library 
