Distributed PV offers many potential benefits, from producing clean energy and giving homeowners energy independence, to offering the utility multiple energy sources. However, there is an inherent problem with solar energy because solar energy production does not match typical residential production patterns.

OPEC members' net oil export revenue in 2015 drops to lowest level since 2004

graph of OPEC net oil export revenues, as explained in the article text

Members of the Organization of the Petroleum Exporting Countries (OPEC) earned $404 billion in net oil export revenue in 2015, according to U.S. Energy Information Administration (EIA) estimates. These earnings represent a 46% decline from $753 billion earned in 2014.


Cogeneration or Combined Heat and Power (CHP) is a highly efficient and environmentally attractive means of generating heat and electric power at the same time. Cogeneration is achieved when a generating plant is constructed in conjunction with an industrial facility (host) that has needs for both the power and heat energy that is produced.