Modifies the definition of renewable energy resources

HB 2578 modifies Missouri's renewable energy definitions and sets new requirements for electric utilities. It redefines "renewable energy resources" to exclude nuclear energy (previously included under "alternative energy resources") and limits hydropower to small-scale systems (≤10MW without new water projects). The bill establishes a phased renewable energy portfolio standard requiring utilities to supply 2% (2011-2013), 5% (2014-2017), 10% (2018-2020), and 15% (2021+) of electricity from renewable sources, with at least 2% from solar. Utilities can meet requirements by purchasing renewable energy certificates (RECs) or contracting directly with "accelerated renewable buyers" for certain projects.