RGGI Carbon Tax in Connecticut Up 900% Since State Joined in 2008

If we had a nickel for every time we've read or heard the Democrats claim the Regional Greenhouse Gas Initiative (RGGI), a tax on carbon dioxide emissions for coal- and gas-fired power plants, doesn't raise electricity rates, we'd be millionaires! Not that it was ever in question that RGGI does raise rates; we now have a smoking gun. Connecticut's carbon allowance auction prices under RGGI have risen from $3.07 per allowance in 2008 to $35 per allowance in June 2026, a jump of over 900%. Connecticut residents pay the third-highest (or second-highest, depending on the source) electricity rates in the entire country behind only Hawaii and California. Massachusetts, another RGGI member, is right behind Connecticut at fourth-highest.

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