; (XV) include procedures for counting electricity savings and natural gas savings achieved by solar heating and cooling technologies, solar light pipe technology, geothermal heat pumps, and other technologies utilizing renewable resources that do not produce electricity or gaseous fuel and reduce on-site energy consumption; (XVI) include procedures for counting electricity savings and natural gas savings achieved by weatherization measures, such as installing mechanical insulation, repairing or replacing heating and cooling systems, repairing or replacing windows and doors, performing air sealing, and replacing lights and appliances with more energy efficient models; (XVII) include procedures for counting electricity savings and natural gas savings achieved from increased utilization of mechanical insulation for new, retrofit, and maintenance construction for commercial, industrial, public, and nonprofit buildings and facilities; (XVIII) in any State in which the State regulatory authority has designated 1 or more entities to administer electric ratepayer-funded efficiency programs approved by the State regulatory authority, provide that electricity savings and natural gas savings achieved through those programs shall be distributed proportionally among retail electricity suppliers and retail natural gas suppliers; (XIX) include guidance for retail electricity suppliers and retail natural gas suppliers to calculate and document business-as-usual consumption projections; (XX) include guidance for estimating savings using information from the database established under paragraph (3) based on similar measures and programs in other settings with appropriate adjustments, as necessary; and (XXI) incorporate advances in the science of policy evaluation, such as the use of— (aa) randomized control trials; (bb) other experimental and quasi-experimental approaches; and (cc) large data sets and machine learning techniques