The Regional Greenhouse Gas Initiative cleared its 73rd CO2 allowance auction on September 9 at $37.65 per ton, the highest settlement price in the program’s history, and raised $1.08 billion for reinvestment across the eleven participating states. All 28,537,847 allowances on offer sold, including the entire 1,148,000-allowance Cost Containment Reserve supplied by Virginia, which means the reserve is now empty heading into the final auction of the sixth control period. For compliance buyers and traders, the result confirms a structural reality: demand in the largest US power-sector carbon market is running well ahead of planned supply, and the shock absorbers are being used up.
The Numbers Behind the Record
The clearing price of $37.65 beats the previous record of $35.00 set at Auction 72 in June, and sits roughly 51% above the $24.99 clearing price from Auction 71 in March. The price trajectory in 2026 has been steep and consistent.
Demand stayed strong even at record levels. Sixty-five bidders submitted bids for 2.6 times the initial offering of about 27.4 million allowances, up from a cover ratio of 2.4 in June, with 76 entities qualified as potential bidders. Individual bids ranged from $2.69 to $190 per allowance, according to the market monitor report prepared by Potomac Economics, which found no material evidence of collusion or manipulation. The clearing price landed about 4% below secondary market prices ahead of the sale, a normal discount that suggests the auction did not chase the spot market higher.
Compliance entities purchased 53% of allowances sold, with compliance-oriented entities taking 49%. That compliance share is historically low: across the first 73 RGGI auctions, compliance entities have purchased 71% of all allowances sold. Investors, in other words, are carrying an unusually large share of current demand.
Virginia Is Now a Supply-Side Swing Factor
Virginia resumed RGGI participation on July 1, 2026, and Auction 73 was its first full appearance in the supply stack. The state contributed 5,740,000 allowances to the initial offering, and its 2026 Cost Containment Reserve of 1,148,000 allowances was made available for the first time.
The CCR is a fixed tranche of extra supply released only when the auction’s interim clearing price exceeds a trigger level, set at $18.22 for 2026. Bid volume above that trigger exceeded the initial offering, so Virginia’s entire reserve was released and sold. This is the second CCR release this year: the ten states participating at the start of 2026 saw their own reserves fully released back in March at Auction 71.
The consequence matters more than the mechanism. Because Virginia’s CCR is now exhausted, no CCR allowances will be available at Auction 74 on December 2. The price ceiling function of the reserve, the tool designed to soften exactly the kind of rally RGGI is experiencing, is switched off for the rest of the year.
What December’s Auction Looks Like Without a Safety Net
Auction 74 will be the last sale of the sixth control period, which ends December 31, 2026, and the final opportunity for covered power plants to true up their positions before compliance surrender. The supply picture is tighter than the headline record suggests.
States supplemented the September offering with about 3.5 million set-aside allowances beyond their regularly planned volumes, and they anticipate offering roughly 2.2 million set-asides in December. That is extra supply, but it is discretionary and shrinking. With the CCR empty, the only automatic stabilizer left is on the downside: the Emissions Containment Reserve, which withholds allowances if prices fall below $8.41, a level the market has not approached in years.
Post-settlement holdings data from the market monitor adds context. After Auction 73, 71% of allowances in circulation are held by compliance-oriented entities, and 79% are believed to be held for compliance purposes overall, including volumes likely banked for the seventh control period. Banking behavior at this scale signals that market participants expect tightness, and higher prices, to persist beyond 2026.
Implications for Buyers, Traders and Investors
For compliance entities in the RGGI footprint, the math is getting uncomfortable. Procurement teams that deferred buying earlier in the control period now face record prices with no reserve buffer in the final auction. The pragmatic options are December auction participation, secondary market purchases, or both, and neither comes with a price ceiling anymore.
For traders and investors, the 47% non-compliance share of Auction 73 purchases is the story to watch. Financial participants are absorbing nearly half of supply at record prices, which supports the market but also concentrates positional risk. If the December auction clears materially above secondary levels, expect scrutiny of how much length speculative buyers are willing to carry into the seventh control period.
For observers of carbon market design more broadly, RGGI in 2026 is a live case study in what happens when a cap-and-trade program adds a major new jurisdiction mid-cycle. Virginia’s return expanded both supply and demand, and the market’s verdict so far is that demand grew faster.
What to Watch
Three markers will define the next quarter. First, the December 2 auction itself: clearing price, cover ratio, and whether the absence of CCR supply produces a visible premium. Second, secondary market behavior between now and then, particularly whether the roughly 4% auction-to-secondary discount persists or widens as compliance deadlines approach. Third, any state-level decisions on set-aside volumes and seventh control period budgets, which will determine whether 2027 brings relief or another year of record settlements. RGGI’s cumulative auction proceeds now stand at about $12.5 billion. The way the program manages scarcity from here will shape how much larger that number gets, and who pays for it.
