The Missouri Solar Energy Industries Association says KCP&L mishandled the solar energy rebate program, partly by making an improper payment to a company that sells the energy systems. State regulators agreed to audit projects installed by U.S. Solar in St. Joseph. Concerns about U.S. Solar were raised in a meeting two months ago, prompting the utility to hire a St. Louis company to audit U.S. Solar and the other top 10 solar companies participating in the rebate program.