You probably already know about the Energy Information Administration as the nation's premier fishing hole for energy statistics of all types.
The mission of the Energy Information Administration (EIA) is to provide policy-neutral data, forecasts, and analyses to promote sound policy making, efficient markets, and public understanding regarding energy and its interaction with the economy and the environment. Created by the Congress in 1977, EIA is the statistical agency of the U.S. Department of Energy and as such is the Nation’s premier source of unbiased energy data, analysis and forecasting. By law, EIA’s products are prepared independently of Administration policy considerations. EIA neither formulates nor advocates any policy conclusions.
EIA provides a wide range of information and data products covering energy production, stocks, demand, imports, exports, and prices; and prepares analyses and special reports on topics of current interest. These products are derived from energy data that is collected by EIA staff. We design and send our statistical surveys to energy producers, users, transporters, and certain other businesses. Companies and households report directly to us. We also make use of data from other sources, such as trade associations and other government agencies.
You may never have explored the site's International section, however. Thus you might not be familiar with the EIA's Country Analysis Briefs. These are updated on an ongoing basis, and offer in-depth energy data for each individual country regarding oil, natural gas and electricity.
Does a nation have any oil reserves? How much does it import? How much electricity generating capacity does it have, and what fuels does it use to produce its power? A "quick facts" page for each country provides every relevant statistic in one location -- such as this one, for the country of Mexico.
There's also a page of links to each country's relevant government and utility websites, and to the country's profile in the CIA World Factbook and its U.S. Department of State Consular Information Sheet. Finally, for each country, there is a Sources page that lets you know where all the data came from.
You can access each complete report in HTML or PDF format. If you think these reports will be useful to you in the future, you can sign up to be notified by e-mail when a new one is posted. Just scroll down the e-mail subscriptions page till you get the the International section and select all reports or just those from regions of the world in which you're interested.
Other aggregate sources of energy information for various countries include:
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