The Wind Tax Credit Was Temporary in 1992 and Kept Coming Back for Decades

There is an old Washington joke that nothing lasts as long as a temporary government program. The wind production tax credit is the closest thing the joke has to a mascot. It was born in 1992 with an expiration date, it has been renewed, patched, restored and expanded for more than three decades, and in all that time almost nobody has been willing to say that a temporary tax break is supposed to end.

This post is built on arithmetic, so let me define the terms first. A tax credit is not a deduction. It comes off the tax bill dollar for dollar. A production tax credit pays a fixed amount for every unit of electricity a qualifying plant generates, and the unit is the kilowatt-hour, the amount of energy a one-kilowatt appliance uses in an hour. A subsidy is any payment or tax benefit that makes an activity pay better than it would on its own. The question is not whether wind turbines turn. They do. The question is what a standing subsidy does to the people who build them, the people who compete with them, and the people who pay the bill.

Where it started

The Energy Policy Act of 1992, signed in October of that year, created the production tax credit for electricity generated from wind and from certain biomass. It was a credit of 1.5 cents per kilowatt-hour, measured in 1993 dollars and adjusted for inflation afterward, available for the first ten years a qualifying facility was in service, and it applied to plants placed in service in a limited window that ended in mid-1999. The logic was the familiar infant-industry argument. A young technology needed a hand while it learned to cut costs, and the hand would be withdrawn when the child could walk.

Hold that argument in your head, because it is the one used for every subsidy that has ever lasted. The test of an infant-industry subsidy is whether the infant ever grows up. Wind turbines of the 1990s were small and expensive. Wind turbines of the 2020s are enormous, and the cost of the machines has fallen a great deal. Yet the credit did not go away, which tells us either that the industry never grew up or that the subsidy had stopped being about growing up.

The renewal calendar

Here is what the record looks like, in order. I give the pattern and tell you where to check the dates, because the details of each extension are a matter of public record at Congress.gov and in the Internal Revenue Code, Section 45.

1. 1992: The credit is created, set to expire in 1999.
2. Late 1990s through the 2000s: Congress extended the credit in a series of short steps, in 1999, 2002, 2004, 2005 and 2006 and 2008 and 2009, often just before or just after the expiration date.
3. Lapses: The credit actually lapsed in mid-1999 and at the end of 2001 and 2003, and each time Congress restored it later, in some cases retroactively. The industry's response is the point of the story: construction swung up in the years the credit was alive and fell in the years it lapsed.
4. 2012 and 2013: The American Taxpayer Relief Act of 2012 extended the credit again and changed the rule so that a project qualified if construction had begun by a deadline, not if it was finished by one.
5. 2014 and 2015: Another extension, then a law that phased the credit down over several years.
6. 2020: The credit was extended once more, to projects that began construction by the end of 2021, at a reduced rate for a time.
7. 2022: The Inflation Reduction Act restored the full credit, tied it to wage and apprenticeship requirements, and extended it for projects that began construction through the early 2030s.
8. 2025: Congress rewrote the schedule. Under the reconciliation law enacted in July 2025, wind and solar projects lose the credit unless they begin construction within a set period after enactment or are placed in service by the end of 2027.

A man who has been told for more than thirty years that a program is temporary is entitled to ask what the word means. Congress treated "temporary" the way a teenager treats a curfew: as a suggestion about the opening bid.

I should be fair about one thing. The 2025 law ended the open-ended character of the credit, and conservatives who spent years arguing for a phase-out should say so plainly. What matters is the lesson. The credit that was meant to end in 1999 survived for a quarter century past that date, and the lesson for any future subsidy is that the end date has to be written into law, defended against extension, and enforced. The same warning applies to the whole family of energy credits, as the The Electric Car Mandate Is a Choice Washington Makes for Your Driveway argues about vehicles.

The arithmetic of a per-kilowatt-hour credit

Now to the numbers, which are the whole point of the format. Here is a hypothetical wind farm, labelled as such, built to show how the credit works. I use round figures so you can check the multiplication yourself.

• Size: 100 megawatts of installed capacity.
• Capacity factor: 40 percent, meaning that over a year the turbines produce 40 percent of what they would if the wind blew perfectly every hour. That is a typical order of magnitude for a good site, though real numbers vary by location and year.
• Hours in a year: 8,760.

Annual output: 100 megawatts times 8,760 hours times 0.40 equals 350,400 megawatt-hours.

Suppose the credit is 2.5 cents per kilowatt-hour. That is a stand-in, since the legal figure is adjusted for inflation each year, and you should look up the figure the Treasury publishes for the year in question. A megawatt-hour is 1,000 kilowatt-hours, so 2.5 cents per kilowatt-hour is $25 per megawatt-hour.

Annual credit: 350,400 megawatt-hours times $25 equals $8,760,000.

Over the ten years of eligibility: $87,600,000.

Eighty-seven million dollars for one hundred-megawatt project is the sort of number that gets built into a financing model. It is also a number that moves the decision about whether to build at all. If the project cost is, say, a few hundred million dollars, a credit of that size can be a large share of the project's return. Put plainly, the plant is no longer judged by whether power buyers will pay enough to cover its costs, but by whether the combination of power sales and the credit does.

That is not a scandal. It is how a subsidy is supposed to work. But it should be said out loud: the credit is a payment from taxpayers who never signed a contract to the owner of a plant, and it is paid in proportion to output, not in proportion to value.

Why the market goes negative

Here is the part the coverage of energy policy almost never explains, and it is where the arithmetic gets strange.

Wholesale electricity is sold in markets where generators offer to sell power at a price, and the grid operator accepts offers from cheapest to dearest until supply meets demand. In an ordinary market, a generator will not sell below its marginal cost, which is the extra cost of producing one more unit. For a gas plant, the marginal cost includes fuel. For a wind turbine, the wind is free, so the marginal cost of one more kilowatt-hour is close to zero.

Now add the credit. A wind farm that earns $25 for every megawatt-hour it generates is better off producing than not producing at any market price above negative $25. If the wholesale price is zero, the plant still gets $25 per megawatt-hour from the Treasury. If the price drops to negative $10, meaning the plant has to pay the grid $10 to take the power, the plant still comes out $15 ahead. So wind farms with the credit have rational reason to offer power at below zero, and they do.

Here is the worked example, with the same hypothetical numbers:

The plant keeps generating all the way down to a price of negative $25. Below that, it would rather stop.

Why does that matter to a family? Because other plants have to live in that market. A nuclear plant, a coal plant or a gas plant that runs around the clock cannot ramp down for a few hours and then back up for free. When wind farms push the price below the cost of running those plants, the plants lose money in those hours, and some close. The grid then has fewer plants that can run when the wind is calm. The subsidy that began as a nudge ends up changing which plants survive, and the people who pay for that are ratepayers when the calm, cold evening arrives and the cheap power is gone. The Texas blackout of 2021 produced a great deal of argument along these lines, and the record is picked apart in Seven Things People Said About the Texas Blackout of 2021, Tested, where the lesson is that no single source takes all the blame, and that reliability is a system property that someone has to pay for.

I do not say that wind is the villain. I say that a subsidy paid per unit of output, regardless of what the grid needs at that hour, is a blunt instrument, and a blunt instrument distorts prices in ways nobody voted for.

The sun gets its own credit

Wind is not the only energy source on this tax-code gravy train. The solar investment tax credit is a different design: instead of paying per kilowatt-hour produced, it gives a percentage of the capital cost of the system as a credit. The Energy Policy Act of 2005 raised the solar credit from 10 percent to 30 percent, starting in 2006, and Congress extended it repeatedly, including in a major extension in 2015 that scheduled a step-down, followed by later adjustments.

An investment credit has its own distortion. It pays for building, not for producing, so the incentive is to put up the equipment and claim the credit, whether or not the system turns out as much electricity as projected. If a 30 percent credit applies to a $100,000 system, the buyer gets $30,000 off the tax bill and the system's price to the buyer is effectively $70,000. The next question is who pays the remaining costs of connecting that system to the grid, a question that the post on Twelve Questions About Rooftop Solar and Who Really Pays for Net Metering answers in detail.

The Inflation Reduction Act of 2022 expanded both credits, adding bonus amounts for projects that met wage rules, used domestic content or were sited in particular communities, and it made storage and other technologies eligible. The more complicated the credit, the more expensive the compliance and the larger the industry of consultants who help claim it. A tax code with that many dials is not a market. It is a negotiation.

The strongest case for the credits

The case, put fairly:

The best case: Every energy source in America has been subsidized at some point, including oil, gas, coal and nuclear. Oil and gas have long enjoyed provisions in the tax code for the cost of drilling and for depletion. Wind and solar are new and have lowered their costs through learning by doing, and credits sped that process. The credits have brought investment to rural counties, paid lease income to landowners, created construction jobs and produced power with no fuel cost and no tailpipe. If the goal is to have a diverse energy supply, credits that level the field are justified.

Here is the response, point by point.

1. "Everyone is subsidized" is a reason to reform the whole code, not to extend one more credit. Conservatives have argued for decades that the tax code should not pick winners in any sector. The fair reply to a defender of the oil depletion allowance is to agree and offer to end it alongside the wind credit. A neutral code beats a tilted one. The answer to "you subsidize yours" is "let's stop both."
2. Learning by doing has a time limit. If the credit had worked as intended, wind would have stood on its own long ago. The record shows a mature technology that still gets paid per unit. At some point the cost curve stops being the argument.
3. The credit's real effect is on timing. The surges and lapses described above show that builders respond to the deadline, not to the long-run economics. A credit that creates a rush to start construction before it expires is manipulating the calendar, and a rush is not a signal of demand.
4. Rural income is real, and it can be earned without distorting the grid. Landowners who lease land for turbines are exercising property rights, and I defend that. A property owner should be free to host a turbine, a well or a pipeline without a regulator's permission to use his own land. That is a point about property, not about the credit.
5. The diversity argument cuts both ways. A grid that depends on subsidized output in some hours and subsidized exit in others is not diverse. It is fragile. Reliability costs money, and a subsidy that hides the cost in the tax code leaves the bill for the ratepayer.

What the Founders would ask

The Constitution's first power for Congress in Article I, Section 8 is the power "To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States." The taxing power is real and broad. Congress may write a credit. The prior question is the one Madison and Jefferson fought over: whether the power to tax and spend for the general welfare is a general license to steer the economy toward the outcomes a majority of the moment likes.

Madison's answer, in his 1792 essay on property, was that a just government protects property of every sort, and he condemned arbitrary exemptions and monopolies. A longer treatment of that essay is in Madison Wrote That Government Exists to Protect Property of Every Sort. Apply it here. A credit that rewards one way of making electricity over another is government favoring one interest over another. A neutral rule would tax all electricity the same and let the buyers choose.

There is also the matter of the debt. Credits are spending through the tax code, and the national ledger is not shy about the result. You can see the running total on the national debt clock. Every year a credit is extended is another year of revenue not collected, and the money has to come from somewhere, usually from borrowing, which is a tax on the future paid by people too young to vote.

The case in brief

1. The wind production tax credit was created in 1992 to expire in 1999, and Congress renewed, restored and expanded it for decades. A temporary subsidy becomes permanent when no one writes a hard stop.
2. The arithmetic is simple. A 100-megawatt wind farm at a 40 percent capacity factor produces 350,400 megawatt-hours a year, and at a hypothetical $25 per megawatt-hour the credit is $8,760,000 a year, or $87,600,000 over ten years.
3. A per-unit credit lets subsidized generators bid below zero and still profit, which pushes down prices, squeezes plants that must run all day, and leaves ratepayers with a less reliable grid.
4. The solar investment credit, raised to 30 percent in 2005, and the 2022 expansion add complexity, and the 2025 phase-down shows that a firm end date can be written when Congress chooses.
5. The fair conservative answer to "everyone is subsidized" is to end the tilt in every direction, not to extend it in one.

What you can do: read Section 45 of the Internal Revenue Code at Congress.gov or the Treasury's site, and ask your representative's office to name any energy credit that has an end date it will actually keep.