Retail electric customers who choose not to participate in an aggregation program adopted under N.H. Rev. Stat. § 53-E:7 shall not be responsible for, and no entity shall require them to pay, any costs associated with such program, through taxes or otherwise except for electric power supply or energy services consumed directly by the municipality or county, or incidental costs, which may include costs necessary to comply with the provisions of this chapter up to the time that the aggregation starts to produce revenue from participating customers, but shall not include any capitalized or operating costs of an aggregation program.