Ключевые слова: ascendant, bill, cash, coins, cost of light, cost of living, costs, dark, ecology, economy, ecosustainability, ecosustainable, electricity, electricity costs, energy, energy dependence, energy sources, energy tariffs, environment, eur, expenses, expensive, household budget, incandescent light bulb, increase, increase in costs, increases, lamp, light, light bulbs, lighting, line, low consumption, money, ordinary costs, raw materials, red, resources, savings, sustainability, sustainable, tariff, value,