Open Questions

Open Aswan High Dam

Why It Is Open Reference works disagree by three years: the cited engineering profile states construction ran 1960 to 1968, while many standard references give completion as 1970 and the formal dedication as January 1971. The disagreement is definitional, whether completion means the end of construction, the last generator entering service, or the dedication, and the atlas cannot settle a definitional dispute by picking a favorite.

What Would Settle It An authoritative engineering history of the dam, or the Egyptian ministry record, stating which event each date names: end of rock-fill construction 1968, final turbine commissioning 1970, formal dedication January 1971. Encyclopaedia Britannica likely settles the framing but is bot-blocked; the fetch is queued for the owner (this file, part B).

Expertise Needed Engineering history

Question posed in Power Technology, Projects, Aswan High Dam.

Open Pioneers

Why It Is Open Biographical sources on Henry J. Rogers, the Appleton industrialist behind the Vulcan Street Plant, document his business role and home in detail but no birth or death date has been found in the sources consulted this pass.

What Would Settle It A primary genealogical record, such as an obituary, gravestone, census entry or probate record, naming his birth and death dates.

Expertise Needed Genealogy and local history

Question posed in American Society of Civil Engineers Official Site.

Open Nuclear Power

Why It Is Open Finland's Onkalo repository, the furthest advanced in the world, remains without an operating licence as of early 2026, with the regulator STUK's decision delayed until the end of June 2026, while the United States shelved its Yucca Mountain repository in 2010 after decades of preparation and billions of dollars of investment, with no replacement site designated since. No country has yet begun routine operation of a deep geological repository for high-level waste, so estimates of when this technology will be proven at scale rest on regulatory and political timelines as much as engineering ones.

What Would Settle It Onkalo receiving its operating licence and beginning waste emplacement, or a comparable repository elsewhere reaching the same milestone, would establish a real-world operating timeline rather than a projected one.

Expertise Needed Nuclear engineering and geology, together with energy policy

Question posed in Wikipedia, Finland; United States sections.

Open Just Transition

Why It Is Open The concept's own reference history hedges its origin: it is widely believed, not established, that Tony Mazzocchi of the Oil, Chemical and Atomic Workers Union coined the phrase in the American labor movement, sometime before the United Nations and the Paris Agreement adopted the framing decades later for climate policy. No precise year or first-use document is cited for the labor-movement origin, only a general attribution.

What Would Settle It A labor history source, an OCAW archive, a biography of Mazzocchi, or a peer-reviewed history of the just transition concept naming the specific speech, pamphlet or year the phrase first appears, rather than the general "widely believed" attribution this entry currently carries.

Expertise Needed Labor history

Question posed in Wikipedia, Just transition, origin section.

Open Nuclear Fusion

Why It Is Open As of 2025 the National Ignition Facility in the United States is the only laboratory to have demonstrated a fusion energy gain factor above one, but the efficiencies needed to reach engineering breakeven, a genuinely net electricity-producing plant, or economic breakeven, where the plant's output pays for its own whole-life cost, are still orders of magnitude away. Every operating fusion device today, including ITER once it reaches full operation, is an experimental or demonstration reactor, not a commercial power source, so no timeline for the first commercial plant is settled.

What Would Settle It A published construction timeline from a national program or private fusion company (ITER, a national laboratory, or a company such as Commonwealth Fusion Systems) confirmed against an independent engineering assessment (IAEA or a national energy department) as targeting genuine grid-connected commercial generation, not a further experimental or demonstration milestone.

Expertise Needed Plasma physics and fusion engineering

Question posed in Wikipedia, Fusion power, current status.

Open First Practical Steam Engine

Why It Is Open Reliable histories agree the engine was erected in 1712 at the Conygree Coalworks near Dudley and Tipton in the Black Country, but no source consulted names the day or month it began pumping.

What Would Settle It A contemporary colliery record, correspondence, or documented primary account naming the specific day the engine started work.

Expertise Needed History of technology

Question posed in Wikipedia: Newcomen atmospheric engine.

Open First Wind-Generated Electricity

Why It Is Open Sources agree Blyth built and ran his cloth-sailed wind turbine at Marykirk in July 1887, but no source consulted gives the specific day.

What Would Settle It Blyth's own notebooks or a contemporary newspaper account naming the exact day the turbine first charged the accumulators.

Expertise Needed History of technology

Question posed in Wikipedia: James Blyth (engineer).

Open Biomass Energy

Why It Is Open Biomass energy covers fuels with their own documented first commercial dates (Biofuels 1975, Biogas 1895); no single first commercial year is defensible for the umbrella category, and traditional biomass burning for heat predates any commercial record.

What Would Settle It A family decision on whether first-commercial-year for this umbrella entity should mean the first traditional biomass trade (undiscoverable) or the first purpose-built biomass electricity station, which this atlas has not yet made.

Expertise Needed Energy history and taxonomy

Question posed in United States Energy Information Administration Official Site.

Open Firewood

Why It Is Open Firewood use for heat and cooking predates written record; no source found by this wave names a first commercial transaction distinct from ordinary prehistoric household gathering.

What Would Settle It An archaeological or economic-history study establishing the earliest documented organized firewood trade, as opposed to informal household gathering, would resolve this.

Expertise Needed Economic history, archaeology

Question posed in United States Energy Information Administration Official Site.

Open Charcoal

Why It Is Open Charcoal production for metal smelting and heating is documented from the Bronze Age onward across many independent cultures, with no single defensible date for the first commercial trade.

What Would Settle It Archaeological dating of the earliest organized charcoal kilns and their trade networks would resolve this.

Expertise Needed Archaeology, economic history

Question posed in United States Energy Information Administration Official Site.

Open Nuclear Fusion

Why It Is Open No fusion facility has ever delivered net electricity to a public grid; the closest milestones (JET, NIF) are laboratory scientific achievements, not commercial power plants.

What Would Settle It The commissioning of the first fusion power plant that sells electricity to a grid would resolve this.

Expertise Needed Nuclear engineering, energy policy

Question posed in International Atomic Energy Agency Official Site.

Open Dry Dung Fuel

Why It Is Open Dry dung fuel has been used since prehistoric times across independent cultures, with no traceable first commercial transaction distinguishing organized trade from household gathering.

What Would Settle It A documented history of organized dung-fuel markets, as opposed to household gathering, would resolve this.

Expertise Needed Economic history, archaeology

Question posed in Wikipedia: Dry dung fuel.

Open Landfill Gas

Why It Is Open Secondary sources describe a 1975 Palos Verdes, California landfill gas project as the first commercial facility of its kind; the primary EPA case study on the project (published 2002) confirms it documents the first attempt at sanitary landfill gas capture but this wave could not extract a quotable exact start year from the primary documents, both encoded PDFs.

What Would Settle It A clean-text primary source, such as a plain HTML history page or an OCR-clean copy of the EPA case study or the 1992 National Waste Processing Conference paper on the Palos Verdes project, confirming the exact start year, would resolve this.

Expertise Needed Energy history

Question posed in United States Environmental Protection Agency Official Site.

Open First Practical Steam Engine

Why It Is Open Wikipedia's "Newcomen atmospheric engine" article and the web sources checked alongside it (Graces Guide, Britannica, historyofinformation.com) all give only the year 1712 for the engine erected at the Conygree Coalworks near Dudley; none names a specific month or day.

What Would Settle It A contemporary record, a colliery account book, a letter, or a dated notice naming the day the engine was first put to work.

Question posed in Wikipedia, Introduction and spread section, on the Conygree Coalworks engine.

Open First Wind-Generated Electricity

Why It Is Open Wikipedia's "James Blyth (engineer)" article and the American Physical Society's history piece both date the turbine only to July 1887; neither names the specific day within that month.

What Would Settle It Blyth's own notebook, a dated letter, or a contemporary newspaper account naming the day the turbine first charged the accumulators.

Question posed in Wikipedia, Career section, on the July 1887 Marykirk turbine.

Open Solid Oxide Electrolysis Cell

Why It Is Open The English Wikipedia article on the solid oxide electrolyzer cell describes its operating principle, materials and applications in detail but names no inventor and no year the first working cell was built or operated.

What Would Settle It A history of technology source, a patent record, an engineering society history, or a peer reviewed review article naming the first working solid oxide electrolyzer cell and the year it was built or first operated.

Expertise Needed Engineering history

Question posed in Wikipedia: Solid oxide electrolyzer cell, Whole article; no History or Research section names an inventor or year.

Open Compressed-Air Energy Storage

Why It Is Open Projections of long-duration storage cost and deployment differ because the underlying cost trajectories are themselves uncertain: hydrogen storage costs have a learning rate broadly similar to lithium-ion batteries but described as much more uncertain, and it remains disputed whether dedicated long-duration storage or alternative flexibility options such as demand response, network expansion or flexible generation will prove the lower-cost path to a high-renewable grid.

What Would Settle It Sustained multi-year cost and deployment data across storage chemistries and grids at high renewable penetration, compared against the competing flexibility options, would settle which projection was closer to reality.

Expertise Needed Electrical engineering and energy economics

Question posed in Wikipedia, Hydrogen and chemical storage; Economics, Market and system value sections.

Open Methane Hydrates

Why It Is Open NOAA estimates hydrate deposits hold roughly twice the carbon of all proven coal, oil and conventional gas reserves combined, but no country has moved past experimental test extraction. Whether stable, economic extraction is achievable at all is unresolved, not merely undocumented: disturbing a deposit risks a large methane release and submarine landslides, so the open question is as much about whether pursuing it is prudent as whether it is possible.

What Would Settle It A sustained, government- or industry-confirmed commercial production project, or an authoritative engineering assessment (USGS, IEA, or a national hydrate research program such as Japan's MH21) concluding commercial extraction is or is not achievable within a stated timeframe.

Expertise Needed Petroleum and marine geology engineering

Question posed in NOAA Ocean Exploration, Ocean Facts, What are gas hydrates?.

Open Nuclear Fusion

Why It Is Open Fusion research has produced real breakthroughs, but every credible timeline for commercial deployment has slipped for decades; World Nuclear Association itself notes the field's own standing joke that commercial fusion has been "about 40 years away" since the 1970s. Current flagship projects target a demonstration of net electricity in the early 2030s to 2040, which is still a prototype, not proof that fusion can be operated economically and continuously at grid scale over decades the way a fission or gas plant is.

What Would Settle It A named fusion plant delivering sustained electricity to a public grid on ordinary commercial terms (not a subsidized one-off demonstration), or an authoritative body such as the IAEA or a national fusion program concluding commercial fusion is or is not achievable within a stated decade.

Expertise Needed Plasma physics and fusion engineering

Question posed in World Nuclear Association Information Library, Nuclear fusion power, Fusion research section.

Open Methane Hydrates

Why It Is Open Field trials in Japan (2013, 2017), a joint US-Japan trial in Alaska, and a South China Sea trial (2020) have all proven that gas CAN be produced from methane hydrate deposits, but none has run at commercial scale or duration. The US Department of Energy's own account of its Alaska field trial calls the result "proof-of-concept" and "just the beginning," explicitly comparing the remaining path to how long shale gas took to become commercial after its own 1970s-1980s research phase.

What Would Settle It A named methane hydrate operation delivering gas to market on ordinary commercial terms over a sustained period (not a short field trial), or an authoritative body such as the USGS or a national energy department concluding commercial methane hydrate production is or is not achievable within a stated decade.

Expertise Needed Petroleum and gas-hydrate engineering

Question posed in United States Department of Energy Official Site, US and Japan Complete Successful Field Trial of Methane Hydrate Production Technologies.