Superior Clear Vehicles II: Slicing Air pollution Whereas Strengthening Native Economies


The Superior Clear Vehicles II rule (ACC II), a regulation first promulgated in California, regulates electrical car (EV) gross sales and works to additional management car emissions. ACC II can considerably enhance the proportion of EVs within the US car fleet, resulting in substantial financial, well being, and emissions discount advantages.

State governments are actually contemplating whether or not to comply with California’s lead in setting a regulation to extend EV gross sales and reduce fossil gasoline car gross sales by 2035, with Colorado lately indicating of their 2023 EV Plan that they plan to undertake ACC II gross sales necessities by 2032 solely.

RMI evaluated the impacts of full and partial adoption of ACC II in Colorado, Michigan, and North Carolina. We discovered these states can maximize the doable advantages of the regulation with full adoption. Nevertheless, even partial adoption of ACC II can yield vital advantages and will result in an necessary EV market tipping level.

ACC II offers a approach for states to undertake extra formidable car requirements

Underneath the Clear Air Act, California is allowed to set car air air pollution requirements which can be extra aggressive than federal requirements, which different states also can undertake. California adopted the Superior Clear Automobile II rule (ACC II) in 2022, and since then, a number of different states throughout the nation are promulgating the rule, together with New York, Washington, Massachusetts, and Oregon.

The regulation seeks to cut back transport emissions and enhance zero-emission car (ZEV) gross sales (the regulation defines ZEVs as EVs and gasoline cell electrical automobiles, often known as FCEVs). This evaluation focuses on the sale of EVs because the sale of FCEVs is marginal as compared. ACC II requires auto producers to promote an growing proportion of EVs over time and stipulates a 35% gross sales requirement in 2026, ramping as much as a 100% gross sales goal in 2035 (See Exhibit 1).

States throughout the nation can meet federal requirements or undertake California’s car commonplace. In the event that they select to undertake California’s commonplace, they need to comply with California’s compliance mechanisms, nonetheless, they’ve discretion in figuring out when the regulation comes into impact and whether or not to hold the gross sales targets by 2035 or a mannequin yr prior. For instance, Colorado is contemplating partial adoption of ACC II gross sales targets by 2032, somewhat than throughout 2035.

Exhibit 1: ACC II Annual Zero-Emission Car Gross sales Necessities

Exhibit 1: ACC II Annual Zero-Emission Car Gross sales Necessities

States Like Colorado, Michigan, and North Carolina would profit vastly from adopting ACC II

RMI evaluated the impacts from full and partial ACC II adoption in Colorado, Michigan, and North Carolina, all three of which have set targets to cut back economy-wide greenhouse fuel (GHG) emissions by between 90 to 100% by 2050. Rising the deployment of electrical automobiles whereas phasing out fossil gasoline automobiles will probably be a mandatory part to attaining state GHG emissions discount targets. With out accelerating and sustaining the deployment of EVs this decade, it’s going to change into extraordinarily troublesome to satisfy 2050 GHG discount targets.

Michigan, with its historic ties to the auto trade, and North Carolina, with its fast-growing inhabitants, are nicely located to look at ACC II adoption and take into account Colorado’s proposed path of partial adoption.

ACC II adoption can result in financial and environmental advantages whereas serving to these states obtain their emission discount targets. By adopting ACC II absolutely, these three states can cut back their GHG emissions by a further 40% by 2050, in comparison with a state of affairs with no coverage in place.

Sustained EV gross sales also can considerably enhance air high quality, enabling states to cut back particulate matter (PM) and nitrous oxide (NOx) emissions — EPA standards pollution that contribute to respiratory illness — by practically 21% and 28% by 2050.

And the transition away from fossil gasoline automobiles and towards EVs has optimistic financial implications for the native state financial system. Totally adopting ACC II in Colorado, Michigan, and North Carolina would end in a further 19,500 building and manufacturing jobs in 2050 in comparison with business-as-usual.

ACC II adoption can push EV fleet combine previous key market tipping factors

Our evaluation assessed how ACC II gross sales necessities can drive EV deployment and translate over time into an growing proportion of EVs within the car combine. Exhibit 2 under depicts how the gross sales targets outlined below ACC II, ACC II adoption by 2032, and a business-as-usual state of affairs led to differing EV fleet combine shares by 2035.

Exhibit 2: Comparability of Fleet Combine in 2035

Attaining a better market share sooner allows the market to succeed in a “tipping level” the place know-how diffusion could be self-sustained by market forces. Analysis reveals market tipping factors could be outlined mathematically based mostly on logistics curves. When utilized to EV market penetration, this level could be outlined as the purpose when EVs signify 20-30 p.c of the fleet combine or market share. The exhibit under depicts how ACC II adoption can quicken the tempo at which a 25 p.c EV fleet combine is achieved.

Exhibit 3: The 12 months EV Fleet Combine Reaches a Tipping Level of 25 %

The implications of enacting ACC II are related throughout states. ACC II adoption considerably drives EV gross sales and, in the end, fleet combine proportion share within the close to time period. Per Exhibit 3 above, ACC II drives the EV fleet combine to 25% penetration by the 2030-2032 interval in all three states. This is identical interval when RMI estimates that EVs obtain whole value of possession (TCO) value superiority and buy value parity with inside combustion automobiles (ICE). Given the robust financial case for EVs by 2030-2032, shoppers will probably be incentivized on a value foundation to buy EVs, enabling auto producers to succeed in a excessive EV gross sales share even when ACC II targets are phased out in 2032.

ACC II adoption can have main air high quality, jobs, and gasoline financial savings advantages

RMI used the state-level Vitality Coverage Simulator to estimate greenhouse fuel (GHG) air pollution, native air air pollution, gasoline consumption, and financial impacts of Colorado, Michigan, and North Carolina adopting ACC II by 2035 or 2032 in comparison with “business-as-usual.”

In all three states we discovered that adopting ACC II by 2035 leads to vital GHG air pollution discount, native air air pollution discount, gasoline financial savings, and job progress. There are additionally clear financial advantages in catalyzing EV gross sales: EVs allow drivers to economize on gasoline and upkeep prices over the long run, and the additional disposable earnings stimulates every state’s financial system, leading to job progress in comparison with business-as-usual. If these states solely adopted ACC II by 2032, they’d nonetheless reap a majority of the doable advantages as measured in 2050.


If states undertake the complete ACC II — in essence requiring 100% of gross sales to be EVs in 2035 — they’ll take full benefit of all the advantages EVs have to supply and produce extra jobs and financial advantages to their state. Even when states solely partially undertake ACC II, they’d nonetheless notice many of those advantages.

As states take into account whether or not to undertake ACC II in entire or partly, it’s beneficial to think about not simply the various financial, shopper, and well being advantages of EV deployment but additionally the impact this regulation can have on tipping the market towards extra speedy EV adoption.

Enterprise-as-usual can’t be an possibility if the US and the world are to satisfy our local weather targets. The trail ahead is evident, and there’s no time to waste.

By Drew Veysey, Marie McNamara
© 2021 Rocky Mountain Institute. Printed with permission. Initially posted on RMI.


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