California greenhouse gas prices continue their decline

By Blanca Begert | 02/27/2025 06:10 AM EST

Prices for carbon allowances are trading at $12.49 less per ton than at this time last year.

An oil refinery plant is shown.

The prices big emitters have to pay to comply with California’s cap-and-trade program are falling. Mario Tama/Getty Images

Prices for California carbon emissions permits dropped over $2 per ton last week, according to state results announced Wednesday — the third decline since last February when prices were settling at record highs.

The year’s first quarterly sale of pollution permits that high-emitting companies buy to cover their operations in California saw prices settle at $29.27 per ton of carbon, $2.64 below the November 2024 price of $31.91 per ton. The sale generated roughly $850 million for state coffers, down from $1.3 billion in February 2024.

The auction marks the third consecutive price drop since last February, when carbon allowance prices were at their peak of $41.76 per ton after a two-year upswing.

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For the last three auctions, prices have hovered just a few dollars above the floor price, which was $25.87 in last week’s auction.

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