California has long been a laboratory for energy efficiency, testing ideas, technologies, and strategies that ripple across the state and beyond. Among its more imaginative experiments is Innovative Design for Energy Efficiency Applications—aptly dubbed IDEEA 365—a program designed not just to save kilowatts, but to rethink how efficiency can be discovered, tested, and scaled in real-world conditions. Since 2013, IDEEA 365 has offered a year-round, competitive procurement pathway that allows California’s Investor-Owned Utilities (IOUs) to source novel, market-ready solutions from third-party providers. Unlike traditional program cycles bound by rigid timelines, IDEEA 365 was structured to be nimble—responsive to emerging technologies and evolving market needs.

Energy efficiency projects often stall due to budget constraints and stakeholder skepticism—not technology failures. Fresno transformed 76 sites into a coordinated EE program by aligning political priorities, using innovative financing, streamlining procurement, and leveraging data. The result? A system where approval became the easiest option

While many of our favorite programs have since wrapped up, their influence lives on—and the good news is, there are still plenty of current offerings available to meet today’s energy needs. We’re revisiting some of our most memorable projects and sharing how today’s programs continue to support energy conservation across the region

Energy efficiency is crucial for California’s public sector customers, as it helps save money and enhance the quality of public services. When government buildings, schools, and other public facilities use energy wisely, it reduces waste and lowers utility bills—freeing up funds for other community needs.

With rising energy costs, aging infrastructure, and increasing demand for energy, Californians are exploring innovative financing options to make energy-saving upgrades more accessible and affordable. These financial tools not only help homeowners and businesses reduce their carbon footprints, but they also stimulate local economies and create green jobs. In a state where environmental responsibility and economic resilience are closely connected, energy efficiency financing is not just a policy option—it’s a necessity.

As a national leader in clean energy innovation, California is ramping up investments in education and training to build a skilled workforce for the growing energy efficiency sector. From K–12 outreach to advanced certifications, inclusive programs are opening doors to green careers—especially for disadvantaged and underrepresented communities. These efforts are key to powering the state’s ambitious climate goals with equity at the forefront.