For example, precipitation was lower in 2007 than in the previous year, but emissions from energy generation continued to decrease. In 2008, Portugal emitted 10.8 kt of NOx and 4.4 kt of SOx per Mtoe of TPES, compared with the OECD averages of 6.4 and 4.5 kt. For example, the sodium hypochlorite used to prevent algae proliferation in the pipes. The PNAEE implements the EU Directive on energy end-use efficiency and energy services (2006/32/EC). This Directive contains an indicative national energy savings target of 9% up to 2016, to be reached through energy services and other energy efficiency improvement measures in the sectors not covered by the EU ETS. The EU 20-20-20 targets, set out in March 2007, seek: i) a reduction in EU GHG emissions of at least 20% below 1990 levels, ii) 20% of EU energy consumption to be provided by renewable energy sources, and iii) a 20% reduction in primary energy use compared with projected levels, to be achieved by improving energy efficiency.