For alternative energy like solar and wind to work, an infrastructure upgrade on the electrical grid is needed. Microgrids are one possible solution.
Wind and solar power produce intermittent power, which, in small doses, has little impact on grid operations. As we introduce increasingly larger amounts of intermittent power, our transmission system will require significant upgrades and perhaps even a total grid infrastructure redesign, which could take decades and cost billions. With 9,200 power plants that link homes and business via 164,000 miles of lines, a national retrofit is both cost-prohibitive and improbable.