Xiao Wang
@xiaowang1984.bsky.social
Principal Engineer Semiconductor Industry and now a DER/Grid Edge worker as well! Opinions own
Pinned
Xiao Wang
@xiaowang1984.bsky.social
· Nov 19
How California’s Rooftop Solar Customers Benefit Other Ratepayers Financially to the Tune of $2.3 Billion
We correct the Public Advocates Office’s estimated $8.5 billion “cost shift” by updating the retail rates and solar output, setting aside self generation, accounting for saved uti…
mcubedecon.com
Alright friends, so I have spent some time diving into the spreadsheet from this particular report, and I'll be reporting some of the more interesting findings:
mcubedecon.com/2024/11/14/h...
mcubedecon.com/2024/11/14/h...
Even in Massachusetts it looks like we are having second thoughts about the costs of these programs. Passed out of committee 7-0.
www.canarymedia.com/articles/pol...
www.canarymedia.com/articles/pol...
Massachusetts bill would undo climate goals and cut efficiency…
The Democratic lawmaker behind the proposal says it will make energy more affordable, but opponents say it would harm the environment and consumers.
www.canarymedia.com
November 14, 2025 at 2:13 PM
Even in Massachusetts it looks like we are having second thoughts about the costs of these programs. Passed out of committee 7-0.
www.canarymedia.com/articles/pol...
www.canarymedia.com/articles/pol...
Reposted by Xiao Wang
Attorneys for the state of New York agreed in a federal court filing Nov. 12 to suspend the implementation of the All-Electric Buildings Act.
#energysky 🔌💡
See Full Story: ow.ly/YNXY50XrsBo
Writer: Vincent Gabrielle
#energysky 🔌💡
See Full Story: ow.ly/YNXY50XrsBo
Writer: Vincent Gabrielle
November 14, 2025 at 2:00 PM
Attorneys for the state of New York agreed in a federal court filing Nov. 12 to suspend the implementation of the All-Electric Buildings Act.
#energysky 🔌💡
See Full Story: ow.ly/YNXY50XrsBo
Writer: Vincent Gabrielle
#energysky 🔌💡
See Full Story: ow.ly/YNXY50XrsBo
Writer: Vincent Gabrielle
Reposted by Xiao Wang
Climate change hits hardest poor people in hot places.
We need to help them not be so poor and help them not be so hot.
Neither climate change, nor malaria, nor malnutrition will decimate civilization.
Nevertheless, we need to solve all of these problems.
www.gatesnotes.com/home/home-pa...
We need to help them not be so poor and help them not be so hot.
Neither climate change, nor malaria, nor malnutrition will decimate civilization.
Nevertheless, we need to solve all of these problems.
www.gatesnotes.com/home/home-pa...
www.gatesnotes.com
October 28, 2025 at 5:33 PM
Climate change hits hardest poor people in hot places.
We need to help them not be so poor and help them not be so hot.
Neither climate change, nor malaria, nor malnutrition will decimate civilization.
Nevertheless, we need to solve all of these problems.
www.gatesnotes.com/home/home-pa...
We need to help them not be so poor and help them not be so hot.
Neither climate change, nor malaria, nor malnutrition will decimate civilization.
Nevertheless, we need to solve all of these problems.
www.gatesnotes.com/home/home-pa...
There needs to be another name to describe Spanish PV interconnection policy. How about "connect and pray"
October 10, 2025 at 1:05 PM
There needs to be another name to describe Spanish PV interconnection policy. How about "connect and pray"
Sad!
REE are engineers. So they don't get to manage the electricity system any more.
Control has been taken over by political culture-warriors and pork-barrelers, same as in other countries!
So expect regulation by emergency decree, and rapid policy reversals.
Control has been taken over by political culture-warriors and pork-barrelers, same as in other countries!
So expect regulation by emergency decree, and rapid policy reversals.
Spain's grid upgrade decree bites the dust in Congress
Spain’s Congress on Tuesday rejected the Royal Decree-Law 7/2025, locally known as the “anti-blackout” decree, dealing a blow to the government’s plan to bolster the country...
renewablesnow.com
October 9, 2025 at 12:10 PM
Sad!
Damn Spanish grid operator not doing anything in six months was not on my bingo card! Esp when they have energy transition goals and a second blackout would... probably hurt the effort.
elperiodicodelaenergia.com/la-verdadera...
elperiodicodelaenergia.com/la-verdadera...
October 9, 2025 at 11:15 AM
Damn Spanish grid operator not doing anything in six months was not on my bingo card! Esp when they have energy transition goals and a second blackout would... probably hurt the effort.
elperiodicodelaenergia.com/la-verdadera...
elperiodicodelaenergia.com/la-verdadera...
Environmentalists: "climate change is the most important issue of the day and the public demands action"
The public: look at these cute cats!
The public: look at these cute cats!
I think it’s time for bed…
Chinese Hailuo 2 Shows What the Cat Olympics Would Look Like.
Mom's Friends' Cats
Chinese Hailuo 2 Shows What the Cat Olympics Would Look Like.
Mom's Friends' Cats
June 23, 2025 at 1:03 PM
Environmentalists: "climate change is the most important issue of the day and the public demands action"
The public: look at these cute cats!
The public: look at these cute cats!
Reposted by Xiao Wang
Probably about £200k per half hour – less than a penny per bill-payer.
Over the next few months the final pieces of equipment (synchronous compensators; flywheels attached to motor/alternators) will be installed and we will be able to operate without gas when conditions allow
Over the next few months the final pieces of equipment (synchronous compensators; flywheels attached to motor/alternators) will be installed and we will be able to operate without gas when conditions allow
June 22, 2025 at 12:37 PM
Probably about £200k per half hour – less than a penny per bill-payer.
Over the next few months the final pieces of equipment (synchronous compensators; flywheels attached to motor/alternators) will be installed and we will be able to operate without gas when conditions allow
Over the next few months the final pieces of equipment (synchronous compensators; flywheels attached to motor/alternators) will be installed and we will be able to operate without gas when conditions allow
Reposted by Xiao Wang
The number of people who've been like "see this has nothing to do with renewables" as soon as it didn't seem to be an inertia issue have... Puzzled me.
Like ok, let's say inertia had nothing to do with it: this is still a huge example of why VRE has made grid management more complex and risky
Like ok, let's say inertia had nothing to do with it: this is still a huge example of why VRE has made grid management more complex and risky
June 21, 2025 at 12:37 PM
The number of people who've been like "see this has nothing to do with renewables" as soon as it didn't seem to be an inertia issue have... Puzzled me.
Like ok, let's say inertia had nothing to do with it: this is still a huge example of why VRE has made grid management more complex and risky
Like ok, let's say inertia had nothing to do with it: this is still a huge example of why VRE has made grid management more complex and risky
Im getting props for my thread from the power engineers who support renewables 😁😂
June 20, 2025 at 4:50 PM
Im getting props for my thread from the power engineers who support renewables 😁😂
Re: blackout. Focus on the reactive power capability of the thermals I have to say this is akin to blaming a fire that burned down the neighborhood because the fire hydrants were 30% low on pressure instead of the pile of combustibles one of the homes happened to leave next to the open pit bbq.
The oscillations are the FIRST chain in the sequence of events. And the TSOs poor understanding of dispatch limits would play a central role there before the voltage management issues came up subsequently
Also the report is quite clear the voltage services was dispatched for non meshed config
Also the report is quite clear the voltage services was dispatched for non meshed config
June 20, 2025 at 2:35 PM
Re: blackout. Focus on the reactive power capability of the thermals I have to say this is akin to blaming a fire that burned down the neighborhood because the fire hydrants were 30% low on pressure instead of the pile of combustibles one of the homes happened to leave next to the open pit bbq.
Reposted by Xiao Wang
On Spain, I think Xiao has it right here, if not elsewhere in his response to @janrosenow.bsky.social. If the question is whether renewables-heavy grids are fundamentally unstable, then the answer is no. If the question is whether such grids require more rigorous management, the answer is yes.
But if you are the grid operator and getting the settings right is the difference between blackout or no blackout youd think the onus would be on you to dispatch covering uncertainty in your system config. Not find out the hard way. Esp when every gen turned out deficient.
June 18, 2025 at 5:16 PM
On Spain, I think Xiao has it right here, if not elsewhere in his response to @janrosenow.bsky.social. If the question is whether renewables-heavy grids are fundamentally unstable, then the answer is no. If the question is whether such grids require more rigorous management, the answer is yes.
Friends can this be considered topology optimization as a GETS (except don't mess up)
June 18, 2025 at 2:41 PM
Friends can this be considered topology optimization as a GETS (except don't mess up)
Reposted by Xiao Wang
Exactly as I said after the blackout: voltage regulation was issue, not a lack of spinning inertia, as so many quickly speculated (or asserted). It was an off peak spring day, plenty of cheap solar available, and the grid operator cut it too close, failed to commit sufficient voltage regulation.🔌💡
Iberian blackout: not inertia, but lack of procurement of voltage regulation (reactive power absorption) by TSO to blame for spreading power outage, according to first government report. Plausible explanation for the scale of the incident, less for the root cause.
www.reuters.com/business/ene...
www.reuters.com/business/ene...
Miscalculation by Spanish power grid operator REE led to massive blackout, report finds
Spain's power grid operator REE miscalculated its power capacity needs on the day that a surge in voltage caused a massive blackout across the Iberian peninsula in April, a government investigation has concluded.
www.reuters.com
June 17, 2025 at 10:55 PM
Exactly as I said after the blackout: voltage regulation was issue, not a lack of spinning inertia, as so many quickly speculated (or asserted). It was an off peak spring day, plenty of cheap solar available, and the grid operator cut it too close, failed to commit sufficient voltage regulation.🔌💡
Poor renewable management confirmed
Iberian blackout: not inertia, but lack of procurement of voltage regulation (reactive power absorption) by TSO to blame for spreading power outage, according to first government report. Plausible explanation for the scale of the incident, less for the root cause.
www.reuters.com/business/ene...
www.reuters.com/business/ene...
Miscalculation by Spanish power grid operator REE led to massive blackout, report finds
Spain's power grid operator REE miscalculated its power capacity needs on the day that a surge in voltage caused a massive blackout across the Iberian peninsula in April, a government investigation has concluded.
www.reuters.com
June 17, 2025 at 3:50 PM
Poor renewable management confirmed
Reposted by Xiao Wang
June 10, 2025 at 4:32 PM
Well speaking with hindsight all that focus on additionality in blue state REC portfolios seem to be a big self own. Should have locked up the nuclear on a PPA that was $10 more expensive than the gas plants than dally in all that offshore wind and BTM/community solar. Can't cry if someone took it.
June 11, 2025 at 2:42 PM
Well speaking with hindsight all that focus on additionality in blue state REC portfolios seem to be a big self own. Should have locked up the nuclear on a PPA that was $10 more expensive than the gas plants than dally in all that offshore wind and BTM/community solar. Can't cry if someone took it.
This is stupid. I'm sorry. Buy electricity that you can use. Don't feed it in in an area that runs a bunch of nukes.
www.utilitydive.com/news/cambrid...
www.utilitydive.com/news/cambrid...
Cambridge, Massachusetts, inks record 50 MW virtual PPA deal with MN8 Energy
It’s the largest VPPA signed by a U.S. city and the first time a city will use one to offset residential carbon emissions, according to deal broker Sustainability Roundtable.
www.utilitydive.com
June 5, 2025 at 2:25 PM
This is stupid. I'm sorry. Buy electricity that you can use. Don't feed it in in an area that runs a bunch of nukes.
www.utilitydive.com/news/cambrid...
www.utilitydive.com/news/cambrid...
This Tesla grid forming inverter whitepaper will probably give @worstcaseeng.bsky.social a heart attack lmao
digitalassets.tesla.com/tesla-conten...
digitalassets.tesla.com/tesla-conten...
June 4, 2025 at 9:11 PM
This Tesla grid forming inverter whitepaper will probably give @worstcaseeng.bsky.social a heart attack lmao
digitalassets.tesla.com/tesla-conten...
digitalassets.tesla.com/tesla-conten...
Lmao! Proactive grid upgrades for capital costs on distribution shared by ratepayers at 250-$500+ per kw that only pencil because of additional state driven feed in subsidies. I specifically went to Eversource's talk at DTECH about this 😂.
Massachusetts is actually solving a problem lots of states face—how to fairly share costs of building out grids that make room for backlogged distributed solar AND deliver benefits to utility customers. It hasn't been easy, though. Here's how it works:
www.canarymedia.com/articles/sol...
#energysky
www.canarymedia.com/articles/sol...
#energysky
Massachusetts grid breakthrough could benefit customers while…
The state's regulators and utilities are working out a mutually beneficial way to share the costs of the grid upgrades required to build more community…
www.canarymedia.com
June 4, 2025 at 12:34 PM
Lmao! Proactive grid upgrades for capital costs on distribution shared by ratepayers at 250-$500+ per kw that only pencil because of additional state driven feed in subsidies. I specifically went to Eversource's talk at DTECH about this 😂.
Yo @sovacool.bsky.social I heard you had a paper that showed transmission costs come in under budget! Can I see the source dataset for this and which transmission projects were in this. Pretty curious in light of every single important AEMO tx project going over budget here!
June 4, 2025 at 12:04 PM
Yo @sovacool.bsky.social I heard you had a paper that showed transmission costs come in under budget! Can I see the source dataset for this and which transmission projects were in this. Pretty curious in light of every single important AEMO tx project going over budget here!
In other news water is wet folks. 😂
1/4. This study is another example of how universities and governments can partner to conduct research that simultaneously advances scientific and practical insights.
Our county learned (the hard way) that electric buses don't work well here. Now we know why:
news.cornell.edu/stories/2025...
Our county learned (the hard way) that electric buses don't work well here. Now we know why:
news.cornell.edu/stories/2025...
Electric buses don’t like the cold, study finds | Cornell Chronicle
In collaboration with Tompkins Consolidated Area Transit, researchers found that a pilot fleet of seven electric buses consumed up to 48% more energy in cold weather.
news.cornell.edu
May 28, 2025 at 11:12 PM
In other news water is wet folks. 😂
If anyone wants a good laugh we can look at this poorly aged prediction from Synapse energy 8 years ago thinking that NE natty gas gen would be down 41% by now to try to argue that building a pipeline upgrade was a waste of money
www.utilitydive.com/news/new-rep...
www.utilitydive.com/news/new-rep...
May 28, 2025 at 10:22 PM
If anyone wants a good laugh we can look at this poorly aged prediction from Synapse energy 8 years ago thinking that NE natty gas gen would be down 41% by now to try to argue that building a pipeline upgrade was a waste of money
www.utilitydive.com/news/new-rep...
www.utilitydive.com/news/new-rep...
I want a diesel heater option for my EV car
May 28, 2025 at 10:20 PM
I want a diesel heater option for my EV car