Baku, Azerbaijan, May 17
Azerbaijan is an important energy provider for the EU, the EU Council Twitter account page reported.
"Azerbaijan is an important energy provider for the EU and (it) will participate in the Riga Summit on May 21-22, 2015," according to information posted on Twitter.
The Eastern Partnership (EaP) is an initiative of the European Union.
The project was initiated by Poland and a subsequent proposal was prepared in co-operation with Sweden. It was presented by the foreign minister of Poland and Sweden at the EU's General Affairs and External Relations Council in Brussels on 26 May 2008.
The Eastern Partnership was inaugurated by the European Union in Prague in May, 2009.
The second Summit was held in Warsaw in September, 2011, while the third Summit in Vilnius in November, 2013.
TAP is meant to transport gas from the Caspian region via Greece, Albania and the Adriatic Sea to southern Italy and further to western Europe.
The pipeline's total length is about 870 kilometers.
The construction of the pipeline is expected to start in 2016. TAP's initial capacity will be 10 billion cubic meters per year, expandable to 20 billion cubic meters per year.
TAP's shareholders are: BP (20 percent), SOCAR (20 percent), Statoil (20 percent), Fluxys (19 percent), Enagas (16 percent), and Axpo (five percent).