NERC Reliability Auditor. Grid operations expert. Director - https://xitter.cf/t.co/FBLb3jDcHe, https://xitter.cf/t.co/lUFfmkeTUu. Former IESO Grid & OH Generation & Transmission Operator.

Kingsville ON
Joined December 2012
Tom Hess ⚡️ retweeted
Nice wind lull going on. If you follow the white Ontario demand line, we never stop running gas, so we are charging batteries with gas and then discharging that gas-generated energy during the peaks. The emissions savings of gas-powered batteries? 🤷🏻‍♂️ 😂
Rolling 14-day Ontario power mix🦇🎃🧙♀️👻:
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Bruce Unit 6 has reached a continuous run of 500 days today, almost 1.4 years & counting! Its first grid connection occurred in 1984. Reliable 24/7/365 performance! #CANDU 🍁 #NuclearEnergy 🇨🇦 Naturally.
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Tom Hess ⚡️ retweeted
Cavemen Issues Dire Warning That The Wheel Is Going To Eliminate Countless Jobs
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NOAA published Sep data & the 12-month average global temperature anomaly was +1.15°C. ncei.noaa.gov/access/monitor… Tropospheric anomaly data is included for reference. nsstc.uah.edu/data/aosc/Glob… (Tropospheric data is 12-month, shifted from its 14.11°C base to 13.9°C for comparison.)
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Global land & ocean temperature is trending as the 2nd warmest year on record January to September. Haywood plots are a progressive year to date average. ncei.noaa.gov/access/monitor…
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Meanwhile, the North American continent is trending as the 4th warmest year January to September. Haywood plots are a progressive year to date average. ncei.noaa.gov/access/monitor…
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When it comes back...
What if the ice age came back? 🧊 Chicago, Toronto, New York, Oslo, Stockholm and Berlin would be under the ice. London would not: the ice stopped about 150 km short. Is your city under the ice? ❄️ 20,000 years ago: the last ice age at its peak 🏔️ Ice over 3 km thick over central Canada 🇺🇸 Chicago, New York: under the ice 🌍 Oslo, Stockholm, Berlin, Dublin: under the ice 🇬🇧 London: no ice, the nearest ~150 km north Is your city under the ice? 👇
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Tom Hess ⚡️ retweeted
On this day in Canadian Nuclear History: - In 1990 @opg Darlington Unit 2 entered commercial service. The first unit of the "A" 4-pack to enter service, the planned "B" units were never constructed. Hydro's plans also included the potential for an additional 4-pack, Darlington "C".
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Tom Hess ⚡️ retweeted
"Hydro-Québec bid 10.4 TWh a year." they closed a nuclear power plant for this alchemy? In 2025 ON was a net exporter of nearly 8 TWh to QC - mostly when natural gas was the marginal generator. through Q3, 2026's net exports to QC are up another 12%
"One project alone [the Champlain Hudson Power Express] could provide 1,000 megawatts of hydropower – 50 percent of Indian Point's capacity – and that project has all its approvals." - Paul Gallay, Riverkeeper president, January 2017 Yesterday, CHPE delivered zero. It wasn't an outage. NYISO listed the line as available at its full 1,250 MW for all 24 hours, and Hydro-Québec scheduled nothing across it. The last time that happened was July 28. The drop came fast: CHPE carried 15–20 GWh a day from Sept 28 to Oct 1, then 7.6 GWh on Oct 2, about 3 GWh on Oct 3 and 4, and nothing on Oct 5. Is that allowed? Yes. Hydro-Québec's contract with NYSERDA has no daily or hourly delivery requirement. According to the PSC order approving it: The only floor is seasonal. Hydro-Québec has to deliver 40% of its promised annual amount in each six-month period. That floor isn't enforced yet. It's measured over three seasons and doesn't start counting until the third, so the first real test is around summer 2027. Outages shrink it. It's reduced whenever the line is down, and for curtailment and force majeure. Hydro-Québec is paid only for what arrives. A zero day costs ratepayers nothing, and also delivers nothing. The promise was much bigger than the floor. Hydro-Québec bid 10.4 TWh a year. When the PSC approved the contract, it said that number showed the "objective to fill the CHPE line to maximum capacity for 95% of the year." Since June 1, CHPE has delivered 0.68 TWh, about 19% of that pace. Over the entire day: New York used 378 GWh. Gas supplied 36%, nuclear 20%, hydro 18%, solar 9%, wind 9% and imports 8%. Demand peaked at 18.0 GW at noon, and NYC's highest-priced hour hit $97/MWh.
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Quebec continues as a net electricity importer, not even counting Labrador imports. Seems that water supplies for their massive hydro facilities continue to be challenged. HQ took advantage of selling now and then when prices are elevated.
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September daily output from my home micro #solarassist energy facility. 300 W of PV modules connected via matching grid tie inverter. Typical peak output 165 W year-round with momentary up to 190 W. Limited by panel & inverter efficiency. 23.56 kWh energy produced. More cloud.
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System configuration notes: Non-tracking panels, seasonal azimuth adjustment. Full southern 180° exposure. Summer morning shade to 10:00 and evening due to sun's wide sweep NE position. Peak daily kWh output per month to September: 1.29 135 1.39 1.42 1.39 1.38 1.34 1.30 1.25
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Observations: Typical solar panels operate at 60% to 75% of rating. Actual nominal output for facility is 55% including inverter losses. System peaks at 190 W in clear sky under a reflective cloud lensing. (E.g. white cumulus clouds near solar path)
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Tom Hess ⚡️ retweeted
With the last Pickering unit disconnected from the grid today, we are pleased that this event did not signal an end, but rather a rebirth for Pickering Nuclear. @Pickering2075 #CANDU 🍁 #NuclearEnergy 🇨🇦
Today, we safely took Pickering Nuclear’s Unit 6 offline, the last of four units to be powered down, marking the close of a chapter that began in 1971 and the start of an exciting future. For 55 years, Pickering Nuclear has played a central role in Ontario’s growth and prosperity. The station and its workers have tirelessly, reliably, and safely powered homes, businesses, and industries across the province. Now, as OPG prepares to refurbish the station’s Units 5 to 8, pending regulatory approvals, Pickering is poised to help power life in Ontario for decades to come. Today, we reflect on the station’s proud legacy and thank the thousands of dedicated, skilled employees who have helped make this facility one of the best-performing nuclear stations in the world. And we look forward to the beginning of a new era.
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Tom Hess ⚡️ retweeted
We have made it through September without a single hurricane forming in the North Atlantic. This has not happened since at least 1914 (although the lack of satellite observations before 1966 means that pre-1966 NOAA HURDAT2 best track data has significant uncertainty and data gaps, and those gaps widen the further back in time one goes). The only other two times that this may have occurred were in the 1905 and 1907 Atlantic hurricane seasons, respectively. Like 1914, the 1907 season featured no hurricanes that we know of by year end. The first (and only) hurricane to form in 1905 was on October 8th. With no new named storm formations expected for at least the next seven days, we could very well match or eclipse 1908. Tying 1907 and 1914 in terms of having zero hurricanes is also on the table, but I cannot rule a hurricane or two out yet. October and November can throw us curveballs, but with El Niño strengthening in the equatorial Pacific (yielding higher vertical shear in the North Atlantic) and climatology, odds increasingly are in our favor to go the entirety of 2026 without one hurricane in the Atlantic. Pretty incredible stuff from a meteorologist's POV.
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Tom Hess ⚡️ retweeted
Today the final reactor at Pickering NGS is pulled from service pending refurbishment. Unit 6 deserves the honour as it is the champ of the site, having produced over 153 TWh, an equivalent of full Reference unit output for over 297,000 hours (~34 years). cheers to chapter 1
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Tom Hess ⚡️ retweeted
This morning Pickering NGS unit 8 was removed from service - pending a multi-year refurbishment. EFPH ~272,000 Like unit 7 (removed yesterday), unit 8's highest output year was 2025 -both's last full year of service. Only Bruce B's reactors performed more hours pre-refurb
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Tom Hess ⚡️ retweeted
It's all about scaring you to death so they can control every aspect of your life.
I’m officially done being scared of every crisis the news tells me I should be scared of. I’ve reached my crisis limit.
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