It seems very likely that both wind and solar will continue to decline in cost in a classic learning curve way. But what happens when the Federal tax credit expires? The data above show the costs after tax credits, which are worth about $20/MWh. The tax credits expire over the next 4 years. If costs continue to decline at the same rates as they have done for the past 7 years for the next 4, wind will drop by another 43%, solar by another 57%. That will take wind and solar to $15/MWh after subsidy, or $35/MWh before, still substantially cheaper than coal. And that's before any carbon tax. Make no mistake, if, as seems plausible, the increase in global temperatures is accelerating, a swingeing carbon tax is quite certain within a few years.
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*LCOE = levelised cost of electricity.