Mark Z. Jacobson

Mark Z. Jacobson

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Stanford professor of civil & environmental engineering; researches air pollution, climate, and 100% clean/renewable energy systems, posts on grids and storage.

California Hits >
SocialApr 4, 2026

California Hits >

69 of 93 days in 2026 with >100% WindWaterSolar on the California ISO grid. Gas still down 59%, solar up 75%, batteries up 328% since '23 https://t.co/kVss7WH3VQ

By Mark Z. Jacobson
Denial Ignores Clear Warming Data and Stratospheric Cooling
SocialApr 4, 2026

Denial Ignores Clear Warming Data and Stratospheric Cooling

People who deny climate change not only deny the obvious data showing warming rates today faster than any time since even deglaciation from the last ice age and the obvious fact that the upper atmosphere (stratosphere) is cooling due to...

By Mark Z. Jacobson
Republicans Cling to Fossil Preference Despite Renewable Surge
SocialApr 3, 2026

Republicans Cling to Fossil Preference Despite Renewable Surge

Propaganda has brainwashed some of the public to think fossils are good and wind/solar are bad, but fortunately, reality and physics win, as new wind and solar are dominating in the U.S. and worldwide. "A year into the second Trump administration,...

By Mark Z. Jacobson
Fossil Fuels Consume 11% of Global Energy; Renewables Need None
SocialApr 2, 2026

Fossil Fuels Consume 11% of Global Energy; Renewables Need None

To boot, 11% of all energy worldwide is used just to mine, transport, process, and/or refine fossil fuels and uranium. https://t.co/c3RjxqKhcO Whereas wind, solar, geothermal, and hydro require 0 such energy because wind comes right to the turbine, etc. So for anyone to...

By Mark Z. Jacobson
World Adds 814 GW Renewables, 24% Capacity Jump
SocialApr 1, 2026

World Adds 814 GW Renewables, 24% Capacity Jump

The world added 814 GW of wind and solar in 2025, increasing the total installation of the sum of both by 24%, from 3,360 GW to 4,174 GW, in just one year. World New wind in '25: 167 GW (new total ~1,300...

By Mark Z. Jacobson
Renewables Cut Electricity Prices; Fossils Drive Them Up
SocialApr 1, 2026

Renewables Cut Electricity Prices; Fossils Drive Them Up

Which lowers electricity prices, more renewables or more fossil fuels? More wind, solar, geothermal & hydro correlate with lower electricity prices worldwide and across the 50 states. More fossils, nuclear & biomass all independently correlate with higher prices. https://www.youtube.com/shorts/yI9vlrRSc7w

By Mark Z. Jacobson
Hawaii Nears Zero‑Emission Flights: Cargo in 9 Months
SocialApr 1, 2026

Hawaii Nears Zero‑Emission Flights: Cargo in 9 Months

Hawai'i 9 months away from commercial electric cargo flights and 27 months from commercial electric passenger flights. https://t.co/JOtIskF9uy Good start to satisfy Hawai'i's settlement to go 0-emission transport. https://t.co/tR1kGYUCOO @youthvgov

By Mark Z. Jacobson
Renewable Growth Drives Lower Electricity Prices, Not Higher
SocialMar 30, 2026

Renewable Growth Drives Lower Electricity Prices, Not Higher

Just another reminder that, like worldwide, increases in WindWaterSolar in the U.S. correlate with lower, not higher, electricity prices. Please ignore all the spam claims that renewables increase prices. It is fossil fuels and nuclear that increase electricity prices. https://t.co/Lra772hw38

By Mark Z. Jacobson
Renewables Linked to Lower Prices; Fossil & Nuclear Drive Up
SocialMar 30, 2026

Renewables Linked to Lower Prices; Fossil & Nuclear Drive Up

Of course this guy is spewing nonsense. More fossil fuels and nuclear both correlate with higher prices worldwide. Only wind-water-solar correlates with lower prices. https://t.co/288jwtUdqr

By Mark Z. Jacobson
Battery Record Supplies 44% of CAISO Peak Demand
SocialMar 30, 2026

Battery Record Supplies 44% of CAISO Peak Demand

Batteries smash another peak discharge record, meeting 44% of CAISO peak demand at 7 PM on 3/29/26 with 12.3 GW And CAISO is just toying with us, because there are already 15.86 GW installed Gas still down 59.3% in '26 v '23 38...

By Mark Z. Jacobson
Canada's 100% Renewable Goal Needs <0.2% Land
SocialMar 28, 2026

Canada's 100% Renewable Goal Needs <0.2% Land

Moving Canada to 100% WindWaterSolar for all energy purposes (eliminating fossils+nuclear) requires only 0.19% of Canada's land, much less than used just for oil+gas wells in Alberta+BC alone and much less than the tar sands area. https://t.co/yt6XQ531Fu https://t.co/qST8Lj4LRX https://t.co/lwuOl8LGzW

By Mark Z. Jacobson
Audiobook Shows Climate Solutions Without Miracle Technologies
SocialMar 28, 2026

Audiobook Shows Climate Solutions Without Miracle Technologies

Audiobook for "Still No Miracles Needed" now available https://t.co/rFxZs6aOwN "This book describes how to solve the climate crisis, and at the same time eliminate air pollution & safely secure energy supplies for all-without using miracle technologies" https://t.co/irGIq6qRxE

By Mark Z. Jacobson
California’s Grid Generates Double Renewable Power, Cuts Gas 60%
SocialMar 27, 2026

California’s Grid Generates Double Renewable Power, Cuts Gas 60%

WindWaterSolar has produced TWICE the electricity as the SUM of fossil gas, nuclear, and bioenergy on the @CaliforniaISO grid in 2026. Gas is down 59.4%; WWS is up 24.1%; batteries up 335% in '26 v '23. 35 straight and 62 of 85...

By Mark Z. Jacobson
Two States Surpass 100% Renewable Demand, US Average 25%
SocialMar 27, 2026

Two States Surpass 100% Renewable Demand, US Average 25%

In 2025, two U.S. states met >100% of grid + behind-the-meter electricity demand with WindWaterSolar. 14 states met 50-124% of demand: 7 dominated by wind 3 by solar 4 by hydro U.S. average: 25.72% WWS https://t.co/KP3uii4BqI https://t.co/Ntf3DHeGdW

By Mark Z. Jacobson
Wind, Water, Solar Provide 30% of Global Power
SocialMar 25, 2026

Wind, Water, Solar Provide 30% of Global Power

30% of world's electricity came from WindWaterSolar 2024 8.11% wind, 14.33% hydro, 0.29% geo, 6.93% solar 16.2% of world pop has avg WWS generation 73% WWS by continent: S Am 57.8% Oceania 57.8 Europe 40.24 N Am 28.04 Asia 26.9 Africa 24.4 MidEast 4.9 https://t.co/KP3uii4BqI

By Mark Z. Jacobson
Renewables Lower Electricity Prices; Fossil, Nuclear, Bioenergy Raise Them
SocialMar 25, 2026

Renewables Lower Electricity Prices; Fossil, Nuclear, Bioenergy Raise Them

Whereas more WindWaterSolar correlates with lower electricity prices worldwide, more fossil fuels, nuclear, and bioenergy each independently correlates with higher electricity prices.

By Mark Z. Jacobson
Higher WWS Share Cuts U.S. Electricity Prices
SocialMar 23, 2026

Higher WWS Share Cuts U.S. Electricity Prices

Increasing wind-water-solar (WWS) on the electricity grid decreases electricity prices - 2025 data from 50 U.S. states States with 33-124% of demand met by WWS have electricity prices averaging 2.9 cents/kWh below those with <33% WWS. Results statistically significant. https://t.co/kEDy3HQltg

By Mark Z. Jacobson
Repowering Wind Farms Doubles Output on Unchanged Land
SocialMar 23, 2026

Repowering Wind Farms Doubles Output on Unchanged Land

Plus, you can get twice the power out of the same land simply by repowering existing wind farms. https://t.co/WSQ69VU0c5

By Mark Z. Jacobson
Trump Admin Pays $1B to Halt Wind, Boost Oil Projects
SocialMar 23, 2026

Trump Admin Pays $1B to Halt Wind, Boost Oil Projects

This is about as sick as it gets. Trump Administration to Pay $1 Billion to Energy Giant to Cancel Wind Farms. In exchange, the French company TotalEnergies would invest in oil and natural gas projects in Texas and elsewhere. https://t.co/2VC6NSQv9N

By Mark Z. Jacobson
Breakthrough Institute Files Amicus Supporting Trump's Fossil Push
SocialMar 23, 2026

Breakthrough Institute Files Amicus Supporting Trump's Fossil Push

Just to demonstrate once and for all that the Breakthrough Institute (@TheBTI) is a climate-denying, pro-fossil/nuc group, here is their "Amicus Brief," authored by (led by Nordhaus & Trembath) supporting Trump's Executive Orders Unleashing Fossil Fuels https://t.co/l9xcTFk2qA

By Mark Z. Jacobson
Renewables Lower Electricity Prices, Not Increase Them
SocialMar 22, 2026

Renewables Lower Electricity Prices, Not Increase Them

Everything this guy says is fake or misleading. The chart is one of taxes, not RE cost https://t.co/LxtCmfzTkR RE correlates with lower, not higher, electricity prices. Of the 14 states meeting 50-124% of demand with WWS, 12 are 2-5...

By Mark Z. Jacobson
US Sanctions Lift Fuels Fossil Reliance over Clean Energy
SocialMar 21, 2026

US Sanctions Lift Fuels Fossil Reliance over Clean Energy

It is crazy all the hoops we jump through to burn fossil fuels into poison we breathe, when solar, wind, geothermal, and hydro can provide all the energy we need with no fuel cost or poison US lifts sanctions on Iranian...

By Mark Z. Jacobson
California Hits 100% Renewable Demand, Shatters Battery Record
SocialMar 21, 2026

California Hits 100% Renewable Demand, Shatters Battery Record

In the face of record March temperatures, @California_ISO not only met 100% of demand with #WindWaterSolar for part of the day 3/20 but also smashed 2-day-old battery peak discharge record with 11.91 GW, meeting 34% of peak demand All with 60%...

By Mark Z. Jacobson
Tech, Not Miracles, Holds Climate‑Saving Power
SocialMar 20, 2026

Tech, Not Miracles, Holds Climate‑Saving Power

Webinar on Still No Miracles Needed: How today's technology can save our climate and clean our air. Friday, March 20, 08:00 Pacific Time / 15:00 GMT https://t.co/UgcYYUJaId

By Mark Z. Jacobson
Repowering U.S. Wind Farms Could Double Output to 21% Demand
SocialMar 19, 2026

Repowering U.S. Wind Farms Could Double Output to 21% Demand

New paper: Repowering existing U.S. wind farms with newer turbines could double current output so that the U.S. could meet up to 21% (instead of 10.5% currently) of electricity demand from wind. Paper: https://t.co/WSQ69VU0c5 Article https://t.co/aApXUcPvjp

By Mark Z. Jacobson
California Hits 100% Renewable Days, Gas Plummets
SocialMar 18, 2026

California Hits 100% Renewable Days, Gas Plummets

70% (53 of 76) of all days and 26 straight in 2026 on the California ISO have experienced >100% WWS for part of the day, averaging 3.2 h/day among all 76 days. Gas down 61% in '26 v '23 Batteries up 329%,...

By Mark Z. Jacobson
Texans Pay 23% More Electricity Despite Lower Rates
SocialMar 15, 2026

Texans Pay 23% More Electricity Despite Lower Rates

Why do Texans pay 23% more yearly for electricity than Californians although the price of electricity in California is over twice that in Texas? https://t.co/JGaEoLb0aa https://t.co/eQRqKA42vz

By Mark Z. Jacobson
US and China on Divergent Clean Energy Timelines
SocialMar 14, 2026

US and China on Divergent Clean Energy Timelines

Global Clean Energy Transition Timelines Reveal Stark Contrasts Between US and China https://t.co/BnXbuEhVsT The paper https://t.co/zoRcoqTczK

By Mark Z. Jacobson
Offshore Wind Starts Powering New England, Reducing Fossil Harm
SocialMar 14, 2026

Offshore Wind Starts Powering New England, Reducing Fossil Harm

Offshore wind begins saving New England from the death, illness, insecurity, and high cost of fossil fuels. Revolution Wind begins delivering power to New England https://t.co/roDCwngqrz

By Mark Z. Jacobson
Black Rain in Tehran Signals Dangerous Soot Pollution
SocialMar 13, 2026

Black Rain in Tehran Signals Dangerous Soot Pollution

Black carbon is the 2nd-leading cause of global warming after CO2, with 1 million x the warming per unit mass as CO2, but with a lifetime of only a few weeks in the air versus decades for CO2 Oil fires produce...

By Mark Z. Jacobson
California Hits Record Battery Discharge, Covering 10% Demand
SocialMar 13, 2026

California Hits Record Battery Discharge, Covering 10% Demand

Two new battery records on @CaliforniaISO grid: Max battery discharge rate: 56.61 GWh/day Max discharge rate as a percent of demand: 38.0% at 6:55 PM 3/12/26 Batteries met 10.5% of all demand 21st straight & 48/71 (68%) days in 2026 with WWS>100% of demand...

By Mark Z. Jacobson
Renewables Ensure Energy Security, Eliminating Oil Reserve Necessity
SocialMar 13, 2026

Renewables Ensure Energy Security, Eliminating Oil Reserve Necessity

Thanks for proving how energy insecure oil is and how energy secure renewables powering electric vehicles are. There would be no need for an oil reserve or releasing 172 million barrels of oil to control oil prices in a clean, renewable...

By Mark Z. Jacobson
Zero-Fuel Renewables Slash Electricity Costs by Cutting Fossil Expenses
SocialMar 11, 2026

Zero-Fuel Renewables Slash Electricity Costs by Cutting Fossil Expenses

"Why do wind, water, and solar reduce electricity price? Because they have zero fuel cost. They eliminate the energy and cost needed to mine, transport, and process fossil fuels, including from dangerous parts of the world."

By Mark Z. Jacobson
South Australia’s Grid Goes Negative Thanks to Rooftop Solar
SocialMar 11, 2026

South Australia’s Grid Goes Negative Thanks to Rooftop Solar

Grid demand goes below zero in South Australia. How? Not because of a blackout, but because rooftop solar provides so much electricity, there is no need for grid electricity. https://t.co/WucHygiIg9 @renew_economy 14 reasons why rooftop PV is useful https://t.co/4oFi4OUjKU

By Mark Z. Jacobson
Renewables Deliver Low‑Cost, Reliable Electricity Nationwide
SocialMar 11, 2026

Renewables Deliver Low‑Cost, Reliable Electricity Nationwide

Are wind and solar “expensive and unreliable,” as President Trump claims? https://t.co/UiE5Iz8PY4 Graph: WWS supply as a % of demand vs electricity price, by state https://t.co/Tpm8NCnpHF Table: WWS supply as a % of demand https://t.co/KP3uii4BqI Book https://t.co/irGIq6qRxE https://t.co/cY35RF0Ovo

By Mark Z. Jacobson
Renewables Don't Drive Up U.S. Electricity Prices
SocialMar 10, 2026

Renewables Don't Drive Up U.S. Electricity Prices

Think of this graph of real U.S. price and electricity production data, straight from the Department of @Energy, next time you hear the false claim that renewables increase electricity prices and that coal, gas, or nuclear is needed to keep...

By Mark Z. Jacobson
Renewables Dominate California Grid, Gas Down 60%
SocialMar 10, 2026

Renewables Dominate California Grid, Gas Down 60%

In 2023, there was not a single day until spring where WindWaterSolar met >100% of demand for part of the day on the California ISO grid. During winter 2026, so far there are already 45 of 68 such days (66%), and...

By Mark Z. Jacobson
Switch to EV, Save $31,500 Over 15 Years
SocialMar 9, 2026

Switch to EV, Save $31,500 Over 15 Years

Good time to replace your gasoline car with a battery-electric car and save $31,500 in fuel cost over 15 years: = 15,000 mi/y x 15 y x ($5/gal-gas - $0.8/gal-equivalent-electricity) / 30 mi/gal = $31,500 Gasoline prices could reach $5 a...

By Mark Z. Jacobson
Fossil Gas Electricity Drops
SocialMar 8, 2026

Fossil Gas Electricity Drops

Fossil gas use for electricity down 59.5% in 2026 versus 2023 in the world's 4th-largest economy. 16th-straight and 43rd of 66 days in 2026 with >100% WindWaterSolar on California's main grid Fossil gas use continues to plummet as solar & batteries...

By Mark Z. Jacobson
California Solar‑Battery System Doubles Nuclear Output Reliably
SocialMar 8, 2026

California Solar‑Battery System Doubles Nuclear Output Reliably

California’s solar and batteries can now produce almost twice the constant output, day and night, as its nuclear plant, at the same reliability as the nuclear plant https://www.youtube.com/shorts/pGwQu57-khk

By Mark Z. Jacobson
Renewables Boost Ukraine’s Grid Resilience Against Attacks
SocialMar 7, 2026

Renewables Boost Ukraine’s Grid Resilience Against Attacks

Three real-world examples, all occurring at the same time, of how fossil-fuels create energy security risks and distributed WindWaterSolar reduces them 1) Ukraine builds new power grid w/solar, wind, batteries that better withstands Russian attacks https://t.co/NX5wIKD79L

By Mark Z. Jacobson
China on Track for 100% Renewable Energy by 2051
SocialMar 7, 2026

China on Track for 100% Renewable Energy by 2051

As a result of China's rapid installation of WindWaterSolar, China can reach 100% WWS across all energy sectors by 2051 if it continues installing at this rate and electrifies all energy. The U.S. and India - only 100 years later https://t.co/Uzltn86O33

By Mark Z. Jacobson
Solar and Batteries Outperform Nuclear in Cost and Speed
SocialMar 6, 2026

Solar and Batteries Outperform Nuclear in Cost and Speed

So what's the purpose of nuclear? CA had enough solar+batteries in 2025 to produce a constant 4 GW every minute of 90% of days in 2025 plus more power during other hours 4 GW=180% of the constant 2.2 GW DC nuc plant,...

By Mark Z. Jacobson
Gas Demand Plummets 59% as Solar, Batteries Surge
SocialMar 6, 2026

Gas Demand Plummets 59% as Solar, Batteries Surge

How low can gas go? Down 59% in 2026 vs 2023 so far. 14th straight and 41 of 64 days in 2026 with WWS meeting >100% of demand for part of the day. Demand also down 3% vs '23 Solar up 62%; batteries...

By Mark Z. Jacobson
Solar‑backed Roofs Can Replace Gas‑fueled AI Data Centers
SocialFeb 27, 2026

Solar‑backed Roofs Can Replace Gas‑fueled AI Data Centers

AI data centers powered by gas are bad "bad for climate, bad for air quality, bad for the environment' "Fastest & cheapest thing to do is to pay homeowners to deploy roof solar with battery backup. Could be done in 6...

By Mark Z. Jacobson
Wind Tops Fossils, Powers Majority in Four States
SocialFeb 26, 2026

Wind Tops Fossils, Powers Majority in Four States

In 2025, wind was the largest source of electricity, beating out fossils, in 4 states (SD, IA, KS, NM) Wind supplied 10.7% of all U.S. grid+Behind-the-Meter demand 4 states met 67-87.4% & 7 states met 40-87.4% of demand with wind https://t.co/nnjeXX6u8n https://t.co/KP3uii4BqI https://t.co/KuQDJr0EW3

By Mark Z. Jacobson
California Leads with Smallest Electricity Price Rise
SocialFeb 26, 2026

California Leads with Smallest Electricity Price Rise

US state rank of % change in res electricity price 2024 to 2025 US avg price: 17.3 c/kWh & increase: 5% (0.83 c/kWh) 3 states (NV, HI, NC) had price decreases CA had lowest % price increase (1.8%) and lower absolute inc (0.58...

By Mark Z. Jacobson
Wind‑Water‑Solar: The Cheapest, Cleanest Path to Energy Security
SocialFeb 26, 2026

Wind‑Water‑Solar: The Cheapest, Cleanest Path to Energy Security

100% clean, renewable energy transition explained: Why WindWaterSolar is cheaper, cleaner, faster, and safer than any other option for addressing global warming, air pollution, and energy security. My clean Energy Edge Podcast with Russ Bates https://t.co/ok8VsPZwTC

By Mark Z. Jacobson
Behind‑Meter Solar Cuts California Grid Demand Amid EV Surge
SocialFeb 26, 2026

Behind‑Meter Solar Cuts California Grid Demand Amid EV Surge

While US grid demand increased 2.1% in 2025, California's declined 3.16%-despite 2.5 mil EVs in CA, lots of heat pumps, and 3rd-most data centers in the US About 36% of the decline was due to growth in behind-the-meter PV BTM PV is...

By Mark Z. Jacobson