Updated to include the 2019 Solar Decathlon winner, Virginia Polytechnic Institute and State University.

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Updated to include 2018 State of California information on the average installed rooftop solar module that is 39" wide by 65" tall (17.6 sq.ft. or 1.6 sq.m.) with an average efficiency of 18.7%, which gives a capacity rating between 285-360 watts.

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Several companies are pushing ahead to be the first to offer commercial grade perovskite solar cells. Oxford PV, a company spun off from Oxford University in 2010, has created a two-layer sandwich cell with perovskite over silicon that has achieved 28% efficiency. That's pretty impressive considering that the theoretical maximum efficiency for a simple silicon cell is 29%, it was just 2015 that perovskite cells in the research lab exceeded 20% efficiency, and most commercial panels installed today are in the 15-17% range. Oxford PV expects to be able to mass-produce silicon-and-perovskite cells and package them together into standard-looking panels for delivery by the end of 2020.

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Updated to include current (2019) wind turbine size information.

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Updated information on net US oil imports, with comment that the US became a net oil exporter for a brief period in late 2018 for the first time in 75 years.

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The Canadian Hydropower Interactive Map has been added to OWOE "Other Resources".

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Updated status of the Cape Sharp Tidal Demonstration Project that has effectively died after turbine issues and the bankruptcy of the project's primary partner.

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Updated to include information on the prototype GE Renewable Energy 5.3 MW Cypress turbine that began generating power in February 2019. This onshore turbine has a 158-meter rotor diameter with a revolutionary two-piece blade design that allows larger turbines with longer blade lengths to be transported to locations that were previously inaccessible.

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