In 1954, people believed the civilization would soon run on ____ energy. At that ____, it would be too expensive to power a large house with solar energy only. All in all, solar energy prices ____ and the efficiency grew. Some companies have leasing models for ____ solar, including maintanance financing. A German community of Wolfhagen invested to ____ the renewables program.

TED Talks: Are solar panels worth it? (Missing word)

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