SUSTAINABLE ENERGY DELIVERY SYSTEM, CONTROLLER, AND METHOD

An integrated low-carbon energy system includes a controller configured to control an amount of H2 gas added to pipe-based delivery system that carries mixture of a fossil fuel in gaseous form with the H2 gas as a minority component by volume, an H2-compatible fuel cell that converts the mixed gas into electricity, a data interface that receives an H2 allocation request signal on behalf of a facility that receives electricity produced by the H2-compatible fuel cell, wherein in response to the H2 allocation request signal, the controller is configured to control a change an addition rate of H2 from a first level to a second level that corresponds with a level requested in the request signal.