In community energy systems where homes share renewable energy, a study used computer modeling to look at energy security. They examined how things like energy cost, availability, and eco-friendliness are affected. The research focused on energy communities that provide heating and cooling. The computer simulations showed that these communities can cut CO2 emissions by 60% and remain cost-effective. The study found that strong community leadership and government support can boost energy security. Also, subsidies and natural gas prices have a bigger impact on energy security compared to CO2 taxes.