After years of effort, a veto by @CharlieBakerMA, & passage of a new veto-proof bill, the #Massachusetts #Climate Roadmap Act is now law! 🎉👏

@MiriamWasser breaks down the law: amp.wbur.org/earthwhile/202…

50% GHG reduction by 2030, 75% by 2045 & Net-Zero by 2050!

#ClimateAction
Here's more details on the back and forth between the Massachusetts Legislature and @CharlieBakerMA over the climate law amp.wbur.org/earthwhile/202…
In addition to updating economy-wide emissions goals for the first time since 2008, the new law: codifies environmental justice rules, directs the utility commission to prioritize equity & emissions cuts, sets EV goals, requires more renewable energy, and much more.
To be fair to @CharlieBakerMA, @MassEEA developed & published in Dec a detailed roadmap for the Massachusetts to get to Net-Zero by 2050, acting under authority from 2008 Global Warming Solutions Act. I served on technical advisory committee for the study. mass.gov/info-details/m…
Last year, @MassEEA set a 2030 emissions reduction target of 45% below 1990 levels wbur.org/earthwhile/202…

The Roadmap Act pushes that goal to 50%. Along with sector-specific targets in the law, that was one source of tension between Baker & Legislature that led to initial veto.
In the end, I applaud both the Massachusetts legislature, incl. champions @JoanMeschino @tomtipagolden & @BarrettSenate, and Governor Baker's @MassEEA, incl. @EEASecretary @ClimateKatie & David Ismay, for all pushing the Commonwealth towards net-zero and a cleaner energy future.

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More from @JesseJenkins

29 Mar
🧵New paper in @NatureEnergyJnl evaluating long-duration energy storage technologies.

Innovative, low-cost storage could make a decarbonized electricity system more affordable and reliable, and partially substitute for clean firm generation.

Summary: bit.ly/LDES_summary
The full paper, led by @nsepulvedam with myself, @dhariksm, Aurora Edington and Richard Lester (old @mitenergy friends!) is at @NatureEnergyJnl here: doi.org/10.1038/s41560…

You can read a copy for a limited time at rdcu.be/chG2k
@MITNews summarizes the new study here: energy.mit.edu/news/powering-…

And I'll do the same with the rest of this thread...
Read 21 tweets
26 Mar
🚨New Study🚨

The key to a 100% clean electricity future in California is Clean Firm Power!

Study led by @EnvDefenseFund & @CleanAirCATF w/3 modeling teams (incl. me).

Read about it in @ISSUESinST: issues.org/california-dec…

Read the full report at: edf.org/cleanfirmpower
Jane Long was fearless leader w/Steven Hamburg + @ArmondCohen1.

Modeling teams: Ejeong Baik @Stanford w/urbs model; myself @Princeton w/GenX; & @ethree_inc's @cleakolster @kiranpchawla & @ArneOlsonE3 w/RESOLVE.

Sally Benson, Rob Jackson, David Victor & @colvin round out team.
This major effort was assembled after California passed the landmark SB100 legislation in late 2018, setting a requirement to reach 100% carbon-free electricity by 2045.

Our question: how can California decarbonize by 2045 without sacrificing reliability or affordability?
Read 10 tweets
6 Mar
Since rebound effects came up in my Voltscast chat w/ @drvolts' intro, a new paper by @steve_r_sorrell is timely! carbonbrief.org/guest-post-why…
"economy-wide impact of these effects and find they may erode more than half of the potential energy savings from improved energy efficiency."
Here's the lit review on rebound effects I wrote @TheBTI in 2011, which @drvolts mentions in the podcast. I inspired by the earlier work of @steve_r_sorrell at UKERC as well as @hsaunders6 thebreakthrough.org/articles/new-r…
Rebound effects describes phenomena where energy efficiency makes energy services (lighting, heating, industrial process) cheaper, inducing greater demand for those services (direct rebound), spending of savings on other energy using activities (indirect) + macroeconomic effects
Read 12 tweets
5 Mar
IMPORTANT NOTE for journalists and others reporting on this ERCOT generator outage data & #TexasBlackout #TexasFreeze:

ERCOT's reporting method for wind capacity outages overstates the impact of wind outages on reliability by about 4x.

Here's why...
The outages reported for wind in this report are based on reductions from the "Seasonal Max MW," which is the maxim rated capacity of the wind farm in the winter. But ERCOT wisely does NOT count on wind farms to produce 100% of their output (the wind is inconstant. Duh).
As the Winter "Seasonal Assessment of Resource Adequacy for the ERCOT Region" report details, ERCOT 'de-rates' wind during winter peak load events to account for its variability. The derate differs for wind in different regions, but the average derate is ~25% of the max capacity.
Read 5 tweets
5 Mar
Ok time for a #EnergyTwitter crowdsource investigation: @ERCOT_ISO just released plant-level generator outage data from the #TexasBlackout. Here's a PDF ercot.com/content/wcm/li…

An Excel file is also out: dropbox.com/s/xz91kfbk0vvx…

Holler if you see anything notable! Ill do same.
No cause of outage information included though, so still requires some real guess-work as to what went wrong.

Focus on ~12:00am-2:00am February 15th period. That's when mass generator outages sent the Texas grid dangerously close to full system blackout. ercot.com/content/wcm/ke…
Like, what the heck was going on here with all of these natural gas plants failing over the course of two hours? Many correlated failures at multiple plants at about the same times (12:23-12:27am; 1:00am; 1:23-1:35am).
Read 8 tweets
25 Feb
Wow, this graphic from a new @ERCOT_ISO report on the #TexasBlackouts shows how close the ERCOT grid was to a cascading failure that could have easily blacked out the whole system. ercot.com/content/wcm/ke… 1/
Going into the night of Valentine's Day, February 14th, a new winter peak demand of 69,222 MW was set at 7:06pm. By 1:23am in the middle of the night on February 15th, frigid temps had left more than 35,000 MW of generating capacity offline. 2/
Faced with greater demand & diminished generation capacity, ERCOT, the grid operator, ordered transmission utilities to start disconnecting millions of customers. The initial order was to shed 10,500 MW of demand. This grew to a height of 20,000 MW by the end of Feb 15th. 3/
Read 11 tweets

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