HCTGS v48 Türkiye — Three Seas, One Highland

Türkiye uses about 57 billion cubic metres of water a year for 86 million people, about 1,300 cubic metres per person. In January 2026 the usable reservoir water of Ankara stood at about 1 per cent, and the Tahtalı dam of İzmir had fallen below 1 per cent. The Konya plain draws about 2.1 billion cubic metres a year more than it receives, mostly from static groundwater. This edition sets out the case for a new source from the sea. The HCTGS Tower is a gravity-fed seawater thermal cascade that splits its intake on land into distillate and dry solids and makes electricity in a turbine ring on the way. One HCTGS Tower is framed at the reference output of the series, one million cubic metres a day, between two ends. The minimum is a coastal HCTGS Tower with bought heat: 2.1–2.3 GW at a gain output ratio of 12–13, 1.1–2.2 TWh of electricity a year and about €1.8 billion of investment. The maximum is a mountain shaft inside an industrial cluster with the full thermal mineral cascade: a gain output ratio of 30–40, 6.0–8.9 TWh a year, €0.8–1.5 billion of investment and a surplus of €259–685 million a year. The Taurus, the Pontic ranges and the Aegean hills stand close to the sea, so the mountain shaft becomes the national standard. 60–70 per cent of the sea’s magnesium burns at the top of the ladder at 1,500–2,200 °C. It lifts the gain output ratio and leaves 0.47–0.55 million tonnes of magnesia per HCTGS Tower. Ten HCTGS Towers form the start on three seas. Thirty-six cover today’s municipal and industrial use, one hundred deliver 36.5 cubic kilometres a year, and 313 — twice today’s national use for a climate 3 °C warmer — form the planning roof. Two highland corridors carry the water inland. The first crosses the Sertavul pass at about 1,660 metres to the Konya plain; condensate is taken off high in the shaft, so only the remaining height is pumped. The second runs from Karadeniz Ereğli to Ankara at a net 2–2.5 kWh per cubic metre. Salinity is treated coast by coast, from 38–39 grams per litre on the Mediterranean and the Aegean to 18 on the Black Sea, where the intake draws surface water only. Net energy imports of USD 47 billion in 2025 exceeded the current-account deficit of USD 25.2 billion. Each HCTGS Tower that replaces gas-fired power keeps USD 0.1–0.6 billion a year in the domestic economy. Land and property gain value wherever the water arrives. One contribution is new to the series: a 1.5-litre aluminium–magnesium–aluminium sandwich bottle. The roll-bonded sheet carries a 0.36 mm core of magnesium alloy between two 0.045 mm aluminium skins and is warm-formed at about 250 °C with cascade heat; a 150-nanometre silica-glass layer seals the inside and the curled mouth. The 0.45 mm wall is as stiff as a solid aluminium wall of 0.42 mm, weighs about 80 g instead of about 100 g and carries 72 per cent seawater magnesium by mass. Vacuum distillation at 700–800 °C returns the magnesium as pure metal and leaves the aluminium in the crucible. The magnesium share outside the fuel of one HCTGS Tower supplies 2.5–3.3 billion bottles a year. The edition applies two lines of the series to the national scale. Salt stores grown from the plant’s own NaCl, MgCl₂ and KCl hold about 100 TWh of heat for 100 HCTGS Towers; the heat returns first to the cascade at about 95 per cent and serves as an electricity reserve for the grid. A bromide-mediated paired electrolysis turns the plant’s own bromine into hydrogen and propylene oxide. The edition also describes network renewal as the first source — distribution losses of about 37–40 per cent equal the output of about seven HCTGS Towers — with gravity-fed pressure zones below high cisterns; five structural forms of the HCTGS Tower with maintenance access outside the process envelope and twin tsunami walls; pressure stages to the highland and energy recovery in the city network; four site classes and a floating class for islands and emergency supply; water free of microplastic from source to tap, with a published measurement protocol and water dosed to each use; carbonate-free seawater magnesia as a low-carbon cement binder, boron as the densest metal fuel of the ladder. A fixed order of destinations for the salt — own chemistry, heat stores, salt-gradient solar ponds, industry, export, construction and salt pits as storage body and reserve — with a published salt account, liquid-desiccant drying of greenhouses with the plant’s magnesium and calcium chloride brines, an AI cluster on a prepared plot with power, cooling and water, the control layer of the fleet, connection priority for hospitals in heat waves and after earthquakes, earthquake safety as the first design rule, twelve industrial packages, a 25-year order book and the training it requires, a shared first pilot, a ledger in two columns, the open parameters of the pilot, about fifty HCTGS Towers per degree of warming as the planning reserve, a comparison of one HCTGS Tower with the country’s largest dam, its nuclear plant and its largest solar plant, a ladder of industrial uses for the separated magnesium metal and potash for fertiliser at the ports of import, the heat-engine physics of natural vortices as the basis of the mountain shaft, a return path for rural settlements along the corridors, and the self-financing of the fleet from the surplus of a first cluster of ten, with a dispatch rule between grid sale and electrolysis that returns most of the electricity into the magnesium loop and into hydrogen. All figures are design estimates for independent engineering validation and pilot measurement. Published as open prior art under CC BY-NC-ND 4.0.