Renewable energy siting

Sun, wind and land as data: irradiance and wind resource, yield models, exclusion masks, terrain shading, grid distance and suitability maps.

A region of fields with the sunshine nearly uniform across it, while setbacks from towns, a protected area and distance to a substation decide which fields remain. the resource picks the country; the grid and the ground pick the fieldPV yield 1,633–1,668 kWh/kWp everywhereNatura 2000sitesubstationsetbacks: 907 → 311 km² leftAcross a 35 km region the sunshine varies by 2%; the rules and the grid decide the rest

A solar or wind resource map is the most persuasive layer in any energy study and the least decisive one. Across a 35 km region around Toledo, PV yield varies by 2.1%; the housing setback alone moves the buildable land from 907 to 311 km². The resource chooses the country and the season. The rules, the terrain and the grid choose the field.

The numbers on the way are easy to get wrong by a round factor. Irradiance is a rate and irradiation a total, and one weather endpoint returns W/m² while its daily sum comes back in MJ/m². Hourly values are labelled at the start, the middle or the end of the hour. Wind at 10 m is not wind at the hub, and energy read off the power curve at the mean speed is wrong in both directions. A buffer of 500 in a geographic CRS is 500 degrees.

The concepts below settle what irradiance, capacity factor, the wind resource, siting constraints, the horizon and power density measure; the how-to guides download real irradiance and wind, model yield, move wind to hub height, build an exclusion mask, compute horizons and grid distance, and rank sites; and the fixes are the five ways these estimates go wrong without looking wrong.

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