Philip Mosenthal


Phil co-founded Optimal in 1996 after acting as Chief Consultant for XENERGY’s (now KEMA’s) Mid-Atlantic office. With over 25 years of experience in all aspects of energy efficiency, Phil specializes in program design and planning for the business, institutional and industrial sectors. Phil has directly implemented programs and assisted numerous clients throughout the U.S. and internationally to develop and analyze efficiency portfolios, design leading edge programs, analyze integrated efficiency and supply-side resources, develop strategic models for large scale efficiency delivery, and develop evaluation plans and oversee evaluation activities. Phil currently serves advisory roles for the Massachusetts Energy Efficiency Advisory Council and Rhode Island Energy Efficiency Resource Management Council, among others. Phil has an M.S. in Energy Management and Policy and a B.A. in Architecture, both from the University of Pennsylvania.

BelliveauEric Belliveau


Eric has been a Partner since 2000. He brings over thirty years of development, sales, operations and management experience in the energy, agricultural, construction and manufacturing industries to his work in energy efficiency. He specializes in efficiency program design, implementation support, direct install program approaches, financing strategies, and customer account management. Eric’s clients have included dozens of Program Administrators and efficiency stakeholders in several states and international jurisdictions. Among his roles, Eric is the lead consultant to the Massachusetts Energy Efficiency Advisory Council where he leads a team of national experts in advising the Council as it oversees implementation of one of the most advanced efficiency portfolios in the country. Eric has a B.A. in International Affairs with emphasis on Economics and German from the University of Maine, 1981. He is LEED accredited.

Managing Consultants

DavidDavid Bardaglio, CMA


David joined Optimal Energy Inc. as Chief Financial Officer/Managing Consultant in 2009. He has over 28 years of experience directing the finance, accounting, information technology and administrative operations for both for-profit and non-profit organizations. For twelve years he was the Financial Director at the Vermont Energy Investment Corporation where he designed and maintained all of the finance, accounting and reporting systems that were instrumental in the creation and ongoing success of Efficiency Vermont, the nation’s first energy efficiency utility. David manages all of Optimal’s internal finance, accounting, IT, and administrative operations and provides a range of budgeting, accounting, finance and reporting systems support to Optimal Energy clients. He received his B.S. in Business Administration from Bucknell University and is a Certified Management Accountant.


BowerSteve Bower, CEM


Steve joined Optimal Energy in 2006.  He has 20 years of experience in information systems planning, design and development, from small custom applications to mission-critical, web-based transaction processing systems and is responsible for strategic planning and development of Optimal Energy’s efficiency investment and economic modeling tools and databases. Steve has managed and been a prime contributor to many energy efficiency and renewable energy potential studies, Technical Reference Manuals, macroeconomic impact studies, and climate impact analysis.  Steve has an M.S. in Natural Resources Planning from the University of Vermont, and B.A.’s in Physics and Computer Science (Magna Cum Laude) from Brandeis University.


GuerardMike Guerard


Mike joined Optimal in 2008. He has over 20 years of experience in the energy efficiency, green building and the renewable energy industry. He has developed and managed a wide-range of energy efficiency programs throughout New England and the Pacific Northwest; renewable energy and green building initiatives; and building science training and education forums. In addition to overseeing dozens of efficiency program staff, he has worked collaboratively with a wide range of stakeholders to achieve positive program results and significant energy savings. Working out of Optimal’s Rhode Island office, Mike provides critical cross-program development and implementation for a wide range of clients. He has a B.A from the University of Rhode Island.


LoiterJeff Loiter


Jeff is Optimal’s Corporate Development Manager. He has more than 16 years of consulting experience in environmental policy, energy, and natural resource issues. Jeff has assisted with the design and development of statewide and utility-specific efficiency programs in several jurisdictions and supports program implementation and ongoing program design and development for clients in New York and New England.  He works primarily in the commercial sector on programs targeting electric, natural gas, and un-regulated fossil fuel consumption and specializes in developing solutions that fit the needs of specific customer segments and markets. Recently, he has provided analysis and testimony for the Sierra Club and other advocacy organizations in several cases before public utility commissions in Ohio, West Virginia, and Virginia. Jeff has an M.S. in Technology and Policy from the Massachusetts Institute for Technology and a B.S. with distinction in Civil and Environmental Engineering from Cornell University. 

Senior Consultants

SocksMatthew Socks, LC, CEM


Matt joined Optimal Energy in 2007 with a background in mechanical engineering, and has particular expertise in the fields of efficiency measure research methodology and characterization practices. Matt has served a leading role in conducting efficiency program engineering, economic analysis, and implementation assessments for clients across North America. He has been a primary contributor to numerous energy efficiency potential analyses and has served as technical lead in the development of energy efficiency savings estimation methodologies for a range of clients. Many of these projects required using novel approaches to address issues such as data availability, program delivery mechanisms, and the unique needs of each client. Matt holds a B.S. in Mechanical Engineering from the Massachusetts Institute of Technology.


McDonaldClifford McDonald


Cliff over 5 years of experience with various policy and technical issues relating to energy efficiency, renewable energy, and LEED certification. His energy experience includes potential studies, program design, cost effectiveness screenings, cash flow analysis, M&V protocol development, and implementation support. Recent projects at Optimal include completing reports on performance incentives and Pennsylvania’s Act 129; working on program design and PUC filings for New York, Washington D.C., and Rhode Island; analyzing the electric-sector GHG emission reductions under the NY State Climate Action Plan; and working on a potential analysis for NYPA. Cliff has a B.S. in Physics from Middlebury College.


SamSam Huntington


Sam joined Optimal Energy in 2009. He has worked on a variety of projects including the development of technical reference manuals, economic impact assessments, and numerous energy efficiency potential studies. From cost-effectiveness analysis to measure characterization to measure adoption rates, Sam is well versed in the methods of efficiency modeling and forecasting. He brings particular expertise to the areas of cost-effectiveness analysis, measure characterization, efficiency forecasting and forward capacity market participation for demand-side resources. Sam is based out of the Rhode Island office where he provides support to the state’s Energy Efficiency and Resource Management Council, as well as other clients in southern New England. He holds a B.S. in Mathematics from Colby College.


CalcangiGretchen Calcagni


Gretchen joined Optimal in 2012. While in graduate school, she interned at Rocky Mountain Institute to help develop strategies for improving energy efficiency in the affordable housing sector. Her master’s project used quantitative data to explore household willingness to pay for improved energy efficiency in the rental housing market as well as policy solutions for barriers specific to this market. At Optimal, Gretchen provides research and analytical support on a range of projects including potential studies, program planning, and expert testimony. Gretchen received a Master of Public Policy from Duke University with a focus on energy and environmental policy and a B.A. in Sociology from the University of Virginia.

Jordan McBee


Jordan received an international master of arts degree from University College London with a focus on economics and business. His master’s thesis used novel quantitative data sets to explain technological innovation at the country level and develop policy strategies for improving technological performance. His prior work experience includes auditing, budget management, program analysis, and academic research support. Jordan also holds a master’s degree in public policy from the Higher School of Economics, Moscow and a B.A. in economics from the University of Florida.

Office Manager

ClodgoApril Clodgo


April provides Optimal and its clients with coordination, editing, presentation, bookkeeping and computer support.