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Greenhouse tomato cultivation allows growers to produce fruit year-round regardless of outdoor climate, using controlled heating, supplemental lighting, and irrigation systems. This consistency lets supermarkets stock tomatoes even in winter months when field-grown varieties are out of season. The trade-off is energy consumption: heating and lighting a greenhouse through cold months requires substantial electricity or gas, a cost that has risen sharply in regions facing energy price volatility. Some growers have shifted to combined heat and power units that generate electricity and capture waste heat simultaneously, cutting net energy costs. Others use natural light-blocking curtains at night to retain warmth without extra heating. Despite higher costs, greenhouse tomatoes often command a price premium, since consumers associate them with consistent size, color, and freshness.