Eligible improvements (PDF) include not only energy-saving equipment such as insulation, lighting, and HVAC systems but onsite renewable energy (rooftop PV, wind turbines, and fuel cells) and water-saving upgrades such as low-flow plumbing fixtures and grey water systems.
Distributed generation ( DG) generally refers to renewable energy systems of less than 20 megawatts (MW), often rooftop solar photovoltaic (PV) arrays, installed close to load and existing transmission.