Europe's Energy Security: Options and Challenges to Natural Gas Supply Diversification [Updated November 5, 2015] [open pdf - 2MB]
From the Summary: "This report focuses on potential approaches that Europe might employ to diversify its sources of natural gas supply, Russia's role in Europe's natural gas policies, and key factors that could hinder efforts to develop alternative suppliers of natural gas. The report assesses the potential suppliers of natural gas to Europe and the short-to medium-term obstacles to those suppliers becoming credible, long-term providers. The report looks at North Africa, potentially the most realistic supply alternative in the near term, but notes that the region faces political, economic, and security instability and problems in the internal structure of the natural gas industry. Central Asia, which may have the greatest amounts of natural gas of any of the alternatives to Russia, would need to construct lengthy pipelines through multiple countries to move its natural gas to Europe."
CRS Report for Congress, R42405
Congressional Research Service: https://crsreports.congress.gov/