Economically Efficient Climate Change Investments
Redoing the Inflation Reduction Act
The Inflation Reduction Act devoted an initially estimated $369 billion over fiscal years 2022–2031 to climate and energy programs, but uncapped credits made the eventual cost potentially much higher. Although the law addressed a genuine environmental externality, it relied too heavily on subsidies for favored technologies rather than policies rewarding the least expensive emissions reductions.
Most economically efficient
Methane emissions charge: Directly priced excessive releases from major oil and gas facilities—the provision closest to conventional “polluter pays” policy.
Technology-neutral clean-electricity credits: Rewarded very low-emission electricity rather than permanently selecting wind, solar or another technology.
Targeted nuclear support: Potentially efficient when it prevented a viable zero-carbon plant from closing and being replaced by fossil generation.
Research, demonstrations and transmission: Addressed innovation spillovers, coordination failures and infrastructure bottlenecks.
Defensible only with strict limits
Hydrogen and carbon capture: Worth retaining for difficult industrial uses only when payments reflected verified lifecycle emissions reductions.
Targeted residential solar, battery and efficiency incentives: Smaller credits could help lower- and middle-income households overcome financing barriers and support useful battery storage.
Charging infrastructure: Networks may require initial support, but subsidies should decline as use increases.
Least economically efficient
Broad EV purchase credits: Paid many affluent households that would have bought an EV anyway and ignored mileage, vehicle weight and the vehicle replaced.
Broad, untargeted homeowner credits: Rewarded installation costs regardless of household income, whether the investment was additional, electricity produced or grid value.
Advanced-manufacturing credits: Pursued industrial or national-security objectives without tying benefits closely to emissions reductions.
Domestic-content, wage and location bonuses: Pursued separate political goals while increasing the cost of emissions reductions. CBO concluded that such conditions can raise project costs and alter investment decisions.
Poorly measured fuel subsidies: These included incentives for sustainable aviation fuel, ethanol-based aviation fuel, biodiesel, renewable diesel and fuels made from corn, soybeans, animal fats or waste products. Depending on feedstock and production, a nominally renewable fuel may provide only modest emissions savings. Credits are defensible only when lifecycle calculations capture fertilizer, processing energy, land conversion and diversion of feedstocks from other uses.
What Republicans Repealed—and What Should Have Survived
The 2025 Republican reconciliation law ended the new, used and commercial clean-vehicle credits; terminated residential clean-energy and efficiency credits; and restricted clean-hydrogen, clean-electricity and advanced-manufacturing credits. It also delayed the methane emissions charge until emissions reported for 2034.
Provisions that deserved reduction or repeal
Large EV credits, particularly subsidies for affluent purchasers of expensive new vehicles.
Open-ended manufacturing credits insufficiently tied to measurable environmental benefits.
Overlapping domestic-content, wage and location bonuses that increased the cost of meeting climate goals.
Fuel credits based on questionable lifecycle-emissions estimates.
Provisions the law cut too aggressively
Residential solar, battery and efficiency credits: These should have been reduced, income-targeted and tied more closely to household or grid benefits—not abolished.
Used-EV credits: A smaller credit for lower-priced used EVs purchased by low- and middle-income households could have survived.
Technology-neutral clean-electricity credits: These deserved a gradual phaseout rather than abrupt restrictions.
Research, demonstration and infrastructure programs: These can address genuine innovation and coordination failures.
Provisions that should have been preserved
The methane emissions charge, because it directly priced a harmful externality.
Targeted nuclear support for plants genuinely at risk of being replaced by fossil generation.
Low-income energy assistance where financing barriers prevent otherwise worthwhile investments.
The law also extended and modified the Section 45Z clean-fuel credit through 2029 while repealing other climate incentives. Republicans therefore preserved a questionable fuel subsidy while weakening more economically defensible policies.
The Joint Committee on Taxation estimated that the energy-tax changes would increase federal revenue by about $499 billion over 2025–2034. Those savings were not used primarily for deficit reduction or a revenue-neutral environmental reform; they helped finance a much larger package of tax cuts.
Redesigning the Weakest Provisions
The weakest Biden provisions could have been replaced by revenue-neutral changes in relative prices:
Electric vehicles: Eliminate large credits for affluent purchasers and luxury vehicles. Retain a modest credit for lower-priced used EVs bought by low- and middle-income households, financed by fees on unusually heavy or high-emission new vehicles. EV owners already avoid gasoline taxes, reducing the need for a large purchase credit.
Residential solar and batteries: Replace the broad 30 percent installation credit with smaller, income-limited assistance. Utilities could receive tax credits or direct-payment equivalents for rebates, leases and performance payments tied to verified battery availability or peak-period discharge.
Solar buybacks: Compensate households according to when electricity is exported and the value it provides to the grid—not automatically at the full retail price, which also finances transmission, distribution and other system costs.
Clean fuels: Replace fixed subsidies with a feebate. Fuels with high verified lifecycle emissions would pay a fee, while genuinely cleaner fuels would receive credits financed by those payments.
Home efficiency: Fees on unusually inefficient furnaces, water heaters and appliances could finance targeted rebates for efficient replacements, particularly in lower-income households and rental properties.
Broader carbon pricing: Carbon fees could be returned through payroll-tax reductions, refundable credits or equal dividends. Most low- and middle-income households could remain financially whole while retaining incentives to choose cleaner products.
Conclusion
The Biden program should have been trimmed and redesigned rather than broadly repealed. Republicans eliminated some poor subsidies but also weakened efficient provisions and used the savings to help finance tax cuts. The larger problem is that Congress appears to contain no organized constituency for the economically preferable middle course: pricing environmental costs, returning the revenue to households, and limiting subsidies to genuine market failures.
A separate memo should examine utility resistance to rooftop buybacks, appropriate export prices, battery subsidies, virtual power plants, utility ownership or leasing, and federal-state regulatory responsibilities.
Many Democrats would have gone considerably further than the Inflation Reduction Act. The House-passed Build Back Better Act combined roughly $1.75 trillion in new spending and tax benefits with substantial tax increases; CBO still estimated that it would increase deficits by about $365 billion over 2022–2031 before counting additional enforcement revenue. The Green New Deal was a resolution rather than detailed legislation, so it had no responsible official price tag, but its proposed ten-year mobilization extended across electricity, transportation, manufacturing, agriculture and the upgrading of virtually every American building. Implementing that agenda would have required not only enormous public expenditures but also an extensive structure of federal subsidies, standards, mandates and regulatory oversight.
The IRA was therefore not the limit of Democratic ambition; it was the portion that could secure enough Senate votes through reconciliation. Republicans subsequently eliminated many of its subsidies, but they did not replace them with a more economically coherent approach. They weakened some poorly targeted provisions, but also delayed pollution pricing and restricted potentially valuable investments, using much of the savings to help finance tax cuts.
The political problem is that there appears to be no organized group in Congress advancing the alternative proposed here: price environmental externalities, return the revenue through broader tax reductions or household credits, preserve high-value research and infrastructure, and sharply target any remaining subsidies. Democrats generally prefer subsidies, mandates and regulatory expansion, while Republicans increasingly oppose both subsidies and pollution pricing. The economically preferable middle position has principles, but almost no congressional constituency.