Hoffman, Ian M., Charles A. Goldman, Gregory M. Rybka, Greg Leventis, Lisa C. Schwartz, Alan H. Sanstad, and Steven R. Schiller."Estimating the cost of saving electricity through U.S. utility customer-funded energy efficiency programs."Energy Policy 104 (2017) 1-12. DOI
Hoffman, Alex, Gregory M. Rybka, David Shephard-Gaw, Ian M. Hoffman, Charles A. Goldman, and Lisa C. Schwartz."Energy Efficiency Reporting Tool for Public Power Utilities." (2016).
Rybka, Gregory M., Ian M. Hoffman, Charles A. Goldman, and Lisa C. Schwartz."Flexible and Consistent Reporting for Energy Efficiency Programs: Introducing a New Tool for Reporting Spending and Savings for Programs Funded by Utility Customers." (2015).
Hoffman, Ian M., Gregory M. Rybka, Greg Leventis, Charles A. Goldman, Lisa C. Schwartz, Megan A. Billingsley, and Steven R. Schiller."The Total Cost of Saving Electricity Through Utility Customer-Funded Energy Efficiency Programs: Estimates at the National, State, Sector and Program Level." (2015).