Renewable energy stocks have been sold off this week after Donald Trump won the presidential election, a boon for short sellers. Bloomberg calculated that the sell-off in renewable energy stocks has given short sellers a paper profit of $1.3 billion based on the lending of shares of a global basket of renewable energy companies.Trump has been a supporter of traditional energy sources such as fossil fuels. During the election, he repeatedly emphasized the need to expand oil and gas drilling and to scrap renewable energy policies. Consulting firm Wood Mackenzie previously said that a Trump victory would jeopardize $1 trillion of expected low-carbon energy investment in the U.S., and that electric vehicle sales would decline, and wind, solar and energy storage projects would be delayed or halted.Plug Power (PLUG), SolarEdge (SEDG), Bloom Energy (BE), First Solar (FSLR) and Enphase (ENPH) are the most shorted renewable energy stocks, according to S&P Global Market Intelligence. Meanwhile, the U.S. solar sector is one of the most shorted sectors in the market.In Europe, Solaria Energia y Medio Ambiente SA, Nordex SE and Orsted A/S are the most shorted renewable energy stocks, according to Bloomberg. The decline in the European basket of renewable energy stocks since Monday's close means short sellers have gained $440 million in paper profits, according to Bloomberg's calculations.