INSIGHT-How renewable energy may be Edison's revenge

LONDON, Dec 20 (Reuters) - At the start of the 20th century, inventors Thomas Alva Edison and Nikola Tesla clashed in the "war of the currents". To highlight the dangers of his rival's system, Edison even electrocuted an elephant. The animal died in vain; it was Tesla's system and not Edison's that took off. But today, helped by technological advances and the need to conserve energy, Edison may finally get his revenge.