The main downside of green energy plans is the potential for increased costs compared to traditional energy plans. This is because renewable energy sources often require new investments in infrastructure and technology. However, it's worth noting that some energy providers offer green energy options at no additional cost, making them more accessible for consumers. Despite the potential higher costs, the long-term benefits of green energy plans, such as reduced environmental impact and support for sustainable practices, make them an attractive choice for those committed to a greener future.