Here are some numbers -- some recent subsidies for fuels that generate electricity, and electricity generation by source back to 1973.
So the subsidies for solar are indeed very high, and for wind they're about 25%.
Is this a problem? I don't think so. The negative externalities of
wind and solar corrected 3/16: fossil fuels -- what they cost that doesn't show up in consumer's monthly bills -- are huge, especially for coal. Mercury emissions that poison streams and can have neurological impacts on infants, SO2 emissions that create acid rain, contributions to ground-level ozone, particulate matter that gets in lungs, and so on. And that's not to mention the damage to miners themselves -- coal miners suffer more fatal injuries than any profession in America. Nor does it include the devastation of mountaintops in eastern coal mining states like West Virginia.
The public pays almost of these costs, while coal companies keep the profits -- a nice form of socialism for them, or as I once put it, from each according to their smokestack, to each according to their lungs.
“Hidden Costs of Energy: Unpriced Consequences of Energy Production and Use”
National Research Council, 2010
found the cost from damages due to fossil fuel use to be $120B for 2005 (in 2007 dollars), a number that does not include climate change and that the study’s authors considered a “substantial underestimate.” For electricity generation by coal the external cost was 3.2 cents/kWh, with damages due to climate change adding another 3 cents/kWh (for CO2e priced at $30/tonne). Transportation costs were a minimum of 1.2 cents/vehicle-mile, with at least another 0.5 cents/VM for climate change. Heat produced by natural gas caused damages calculated to be 11 cents/thousand cubic feet, with $2.10/Kcf in damages to the climate. They found essentially no damage costs from renewables. (Yes, some bird deaths – but fossil fuels kill far more birds than do wind turbines.)
This is money we’re all paying in medical costs (and compromised health), and US governments now pay about half of all medical costs.
Generating power with coal and oil creates more damage than value-added, according to a 2011 paper, with William Nordhaus (once the economist of choice for contrarians) one of the co-authors:
"Environmental Accounting for Pollution in the United States Economy," Nicholas Z. Muller, Robert Mendelsohn, and William Nordhaus, American Economic Review, 101(5): 1649–75 (2011).
Summarizing that paper's findings: for every $1 in value that comes from coal-generated electricity, it creates $2.20 in damages. Total damages: $70 billion per year (in 2012 dollars).
Petroleum-generated electricity is even worse: $5.13 in damages for $1 in value.
In view of damage costs from fossil fuels of at least $120 B/yr -- which was for 2005, and I haven't tried to update it -- do subsidies for wind and solar pay off?
The numbers say it would now pay off for wind, but not for solar:
So the US could save ~ several tens of billions of dollars a year by generating all our power with wind, even when subsidized.
But good luck explaining this to people who object to renewables on the grounds that "the poor can't afford it" (like Roy Spencer is fond of doing). Well, we could subsidize the bills of the poor, but that's no excuse for you or me or someone with a nice professor's salary like Roy Spencer not to pay for clean electricity. I buy 100% green offsets from my power company, Pacific General Electric, at a cost of $0.008/kWh. It costs me about $2.20/month, or an extra 5%.