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In 1997, NPS installed 3 solar hot-water systems at Oklahoma’s Chickasaw park. 2 years later, the largest system supplied 18,194 kWh annually, replacing electric heating

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In 1997, NPS installed 3 solar hot-water systems at Oklahoma’s Chickasaw park. 2 years later, the largest system supplied 18,194 kWh annually, replacing electric heating

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मूल रिपोर्ट: Economic Times

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