Ключевые слова: air, alternative, art, background, black, button, circle, clean, color, colorful, contour, design, development, eco, ecology, electric, electricity, energy, environment, environmental, flat, generation, generator, green, icon, illustration, industrial, industry, innovation, isolated, line, linear, lineart, mill, nature, outline, power, propeller, renewable, rotate, rotation, silhouette, supply, symbol, technology, tower, turbine, wind, windmill,