On 22-25 May voters in the EU's 28 member states will elect their representatives in Europe. Their choices will affect 500 million EU citizens.
The European Parliament has greater powers than ever before, including influence over the EU budget, banking reform, agriculture and energy policy.
What does an examination of data reveal about key issues for Europe's voters?
Energy
The cost of fuel is a big concern for many voters. In the UK and Germany - among many other countries - there has been much debate about rising household energy bills.
The crisis in relations with Russia has highlighted Europe's dependence on imported Russian oil and gas, and encouraged a diversification of sources. Cutting carbon dioxide (CO2) emissions to combat climate change is also a major driver away from fossil fuels.
The chart below shows the diverse pattern of energy consumption in Europe. For example, solid fuel - mainly coal - powers Poland far more than Sweden. The Nordic countries and Austria have embraced renewables - notably hydro and wind power - more than many of their neighbours.
Since 2011 Spain and Portugal have greatly increased electricity generation from renewables - mainly wind and solar. But last year the cash-strapped Spanish government drastically cut subsidies for renewables.
Nuclear power accounts for more than 75% of the electricity generated in France, but in Germany nuclear power is being phased out.
Vote 2014
Vote 2014
Full coverage of the European elections and results
Full coverage of the European elections and results
