PTC Boom-Bust

Between 1999 and 2015, the Production Tax Credit expired and was renewed by Congress 11 times. Each expiration triggered a crash in wind installations; each renewal triggered a surge. In 2013, a PTC expiration year, US wind installations fell 92% from the previous year. This boom-bust pattern destroyed workforce stability and increased costs, the opposite of what the PTC was designed to achieve.

The mechanism is simple. The PTC must be claimed in the year a project enters service. When Congress lets it expire, developers rush to complete projects before the deadline (boom), then halt construction while waiting for renewal (bust). Manufacturing supply chains expand during booms and lay off workers during busts. Turbine factories cannot maintain efficient production when their order book swings from full to empty annually.

The cost of instability. Studies estimate that the boom-bust cycle added 30-40% to wind energy costs compared to what stable, long-term policy would have produced. Each bust destroyed supply chain relationships, skilled labor dispersed, and ramp-up costs were incurred again when the cycle restarted.

The IRA's fix. The Inflation Reduction Act (2022) extended clean energy tax credits for at least 10 years with technology-neutral criteria. For the first time, developers can plan multi-year pipelines with confidence that the incentive will exist when their projects complete.

Did the instability serve any purpose?

Only politically. Short-term extensions let Congress claim credit for renewables without committing long-term fiscal resources. The energy policy was incidental to the appropriations politics. The IRA's long-term extension represents a structural shift from annual political negotiation to durable industrial policy.

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