The transition toward sustainable and decentralized energy systems has prompted the emergence of Peer-to-Peer (P2P) energy trading systems, challenging traditional centralized models. This paper proposes a smart contract-based P2P energy trading system to foster a resilient and sustainable energy ecosystem. By integrating blockchain technology with P2P energy trading, we introduce trust, security, and transparency into energy transactions. Our solution employs an auction-based mechanism and blockchain oracles to address standardization challenges and enhance the accuracy of energy-related data. Additionally, an advanced identity management system ensures secure access to the trading system. Through smart contracts, energy producers and consumers engage directly in transparent and decentralized transactions. Despite challenges such as regulatory uncertainties and scalability concerns, our solution offers a promising alternative for building a more inclusive and sustainable energy future.