The global energy landscape is undergoing a transformative shift toward renewable energy sources in response to climate change, sustainability goals, and decarbonization commitments. However, the intermittent nature of renewables, coupled with the persistent reliance on fossil fuels for grid stability, underscores the need for a structured, integrated planning approach. This study proposes an Integrated Planning Framework that balances the transition to renewable energy with the reliability of fossil-based generation, ensuring a secure, resilient, and cost-effective global energy system. The framework integrates strategic policy alignment, technological innovation, economic optimization, and operational coordination to facilitate a phased energy transition. Strategic planning encompasses national energy strategies, regulatory incentives, carbon pricing mechanisms, and fossil phase-out policies, while technological integration leverages smart grids, predictive analytics, energy storage solutions, and flexible fossil-based generation with carbon mitigation technologies. Economic considerations focus on investment optimization, risk mitigation, and public-private partnerships, ensuring that financial resources are allocated efficiently to support sustainable energy development. Operational coordination and monitoring ensure real-time balancing of supply and demand, grid stability, and adaptive feedback loops for continuous improvement. The framework emphasizes regional customization to account for differences in energy infrastructure, resource availability, and economic capacity, while promoting stakeholder engagement across governments, industry, and communities. Expected outcomes include a balanced energy portfolio, reduced carbon emissions, resilient energy systems, and replicable strategies for diverse global contexts. Future directions highlight the integration of advanced forecasting tools, artificial intelligence, green hydrogen, grid-scale storage, and international collaboration to accelerate decarbonization without compromising reliability. This framework provides a comprehensive, globally adaptable approach to achieving energy transition goals while maintaining system stability, ensuring that renewable integration and fossil energy reliability are harmonized to support a sustainable, secure, and resilient energy future.