You can look up Locational Marginal Pricing (LMP) data. Some Independent System Operators publish the information online. It varies pretty widely by region, and

You can look up Locational Marginal Pricing (LMP) data. Some Independent System Operators publish the information online. It varies pretty widely by region, and by time of day, time of year, condition of the grid, etc. ERCOT: http://www.ercot.com/content/cdr/contours/rtmLmpHg.html http://www.ercot.com/content/cdr/contours/rtmLmpHg.html CAISO: http://www.caiso.com/PriceMap/Pages/default.aspx http://www.caiso.com/PriceMap/Pages/default.aspx MISO: https://api.misoenergy.org/MISORTWD/lmpcontourmap.html https://api.misoenergy.org/MISORTWD/lmpcontourmap.html