[diafygi]

The investment firm Lazard has a nice report[1] on comparing U.S. energy costs by source. Here's the costs in the U.S. (without counting subsidies):

    * Wind:          $  32/MWh
    * Solar:         $  43/MWh
    * Natural Gas:   $  52/MWh
    * Coal:          $  65/MWh
    * Geothermal:    $  82/MWh
    * Biomass:       $  82/MWh
    * Nuclear:       $  97/MWh
    * Solar+Storage: $ 119/MWh
    * Diesel:        $ 212/MWh

So wind and solar are currently the cheapest, but you can only get to about 50% penetration with those without storage[2]. The rest has to be "dispatchable".

[1]: https://www.lazard.com/media/2390/lazards-levelized-cost-of-...

[2]: https://people.eecs.berkeley.edu/~vsmith/docs/renewables_sgc...