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Energy·applied

Wind Micro-Generation

Why it matters

Wind is the romantic of renewable energy — the spinning silhouette that says "autonomy" louder than any panel. And it has a genuine physical case in the right place: wind often blows exactly when solar fails, on overcast winter days and through the night. That makes a turbine the natural complement to a PV-heavy system. But small wind is also where off-grid dreams most often meet disappointment. Yield depends on the cube of wind speed, and the real wind on most sites is far weaker than what their owners feel on their face. The honest discipline of this sense is measurement before purchase: a year or two of anemometer data costs a fraction of the price of a turbine that ends up as an expensive weathervane.

Role in 001's holistic picture

Wind is solar's counterpart on the generation side: strongest when panels are weakest. It plays the honest rival too — our winter PV analysis concluded that enough cheap vertical bifacial capacity may make a turbine unnecessary. Between those two poles, the battery arbitrates, and the measured wind resource decides.

In the world

A worldwide self-build wind culture carries the same discipline this sense demands: build-and-measure, no hype. Hugh Piggott's open-source axial-flux turbine has been refined over some thirty years on the off-grid Scoraig peninsula in Scotland. The rotor spans 1.2–4.2 m, and basic tools are enough to build it. Hundreds of them have been built worldwide, and the design is taught today through the Wind Empowerment network, which keeps it current rather than a vintage plan.

How 001 engages with it

Tepla Gora did the preparation the disciplined way: two years of wind speed monitoring preceded the purchase, the installation location was optimized from that data, a geological survey backed the tower siting, and the foundation was laid from re-purposed prefab concrete blocks to cut the project's CO₂ footprint. But the 4 kW horizontal-axis turbine with its 4-metre rotor — built by a small Ukrainian DIY-scale manufacturer — has never gone up there. Whether it ever will is an open question. Instead, this page's thesis played out on our own land. The machine was raised beside House 001 on just two of its five two-metre tower segments — four metres instead of the designed ten — and roped to a tree to avoid guy wires. In more than a year of standing there it has generated 31 kilowatt-hours in total, less than the house's solar array delivers across two bright days. Almost all of that came from the storms that spin it past 200 rpm. The anemometer at the same four-metre height explains the ledger: the strongest sustained wind in all that time was 8.7 m/s, with gusts to 23 m/s. The cube law does the rest. (The Tepla Gora campaign anemometer sat at a similar three-to-four-metre height and recorded the same maxima.) The result was expected, and we report it as data. A good turbine at the wrong height in sheltered terrain is exactly the expensive weathervane this page warns about.

The current thinking runs in two directions — give the machine its designed ten-metre tower at Tepla Gora, or sell it and try small roof-mounted turbines at House 001 and its neighbours, installed only for the winter months. Behind both options a broader position is settling: a turbine earns its place only where an open site and enough land allow a proper mast to be raised and then managed. Even there, bird strikes, noise, and storm protection remain questions a panel never asks.

At the same time, our published winter-PV analysis openly reconsiders wind for Unity Hub: turbines bring mechanical complexity, maintenance at height, noise, visual impact, and regulatory questions, while panels sit silently and scale linearly. Whether the Unity Hub energy design keeps a turbine at all is an open question. We let the two sense pages argue with each other in public. That is what the measured data is for.

Maturity: applied. Two years of measurement and a reclaimed-block foundation at Tepla Gora, where the tower awaits a decision; field-tested at House 001 on a half-height mast with the expected near-zero yield, reported as data; honestly contested for Unity Hub.

Further reading