This database has been developed and is being keep current by the Department of Energy. Note that the data quality/reliability will vary between the data series, depending on its source.

Please read the description of each data series for further information. Blank data points indicate that no data has been collected for the given period.

Data quality is indicated with a colored circle next to each graph.

         GREEN = High data quality

         YELLOW = Medium data quality

         RED = Poor data quality