With 25+ years of experience and over 1 GW+ of solar and energy storage projects to date, Castillo Engineering is one of the most experienced solar and energy storage engineering firms in the United States. Castillo Engineering delivers expertise in full service (electrical, structural, medium & high voltage) solar and energy storage design, engineering, and consulting services for projects ranging from residential to utility-scale. From 5 kW to 500 MW, we utilize our proprietary site-specific design optimization process to reduce project costs, accelerate your installations & maximize project profitability - all while maintaining the highest quality.