ETC offers 2 kinds of grants. Although, not near the amount you would need for an entire new install. https://www.etcconnect.com/About/About-ETC/Philanthropy.aspxLook for a community foundation in your region. They often have the capacity to fund sizable projects. Maybe they will match dollar for dollar what they district can afford to commit? Perhaps the regional power company will also match, especially if you are converting to LED's. Pursue contacts that administrators in your district or families in your program might have. Working a contact can often be far more successful in getting your grant seen by the right individuals.What exactly failed in the system? A large project like this could be done in a few phases (with the most dire components replaced first).Good luck. Fundraising for such a project can be very challenging.