Abacus Energy Works: Guiding the transition to a sustainable energy future

Abacus Energy Works, LLC

Guiding the Transition to a Sustainable Energy Future

About Us

Supporting our clients as they navigate the transition to a more sustainable energy future.

Why “Abacus Energy Works?”


We chose the name to reflect our core values, our goals, and the services we offer our clients.

 “ABACUS” has two meanings:

A hand-held counting frame consisting of a two-dimensional array of sliding beads used for calculating.

This reflects our expertise in quantifying and verifying the effects and attributes of a pilot, program, policy or investment.

The flat stone sitting atop the capital of a structural column. Its chief function is to provide a supporting surface to bear the weight of the arch or architrave above it.

This sense reflects our dedication to supporting our clients as they strive to achieve their goals in a complex, evolving environment.

Supporting our clients as they navigate the transition to a more sustainable energy future.


Our mission at Abacus Energy Works℠ is to support our clients as they navigate the transition to a more sustainable energy future.

We do this by delivering actionable, easy-to-understand research to end users, energy suppliers, program evaluators, program implementers, partners, regulators, and other stakeholders.

Our guidance ranges from assisting people with limited income remain comfortable at a cost they can afford, to improving response rates on commercial demand response programs, to helping electric utilities modernize the grid to accommodate renewables.

Abacus Energy Works guides you through the transition to a more sustainable energy future


Transition to a sustainable energy future is complex

Energy isn’t simple.

It powers nearly every aspect of our lives, letting us work, travel, and entertain ourselves, keeping us happy, safe, comfortable, and fed. Yet energy can also drive climate change, bringing storms, floods, fires, droughts and other disruptions.

 Stress on the electrical grid arises from extreme weather, increased reliance on renewables, and the electrification of more aspects of our lives, from transportation to cooking to industrial process heat.

Change is in the air.

Here in New Hampshire, we’re seeing beach communities flood, the lobsters and maple trees move north, ski slopes have shorter seasons, farmers’ fields fail from drought or flood.

You are experiencing this, too (maybe not the lobsters). These changes impact our neighbors, communities, economy, and our heritage. With our family, friends, and clients across the world, we’re all adapting to a new world.

We want reliable, resilient energy through this transition, and we’d like to halt – even reverse – climate change. But not at the expense of the very reasons energy is so important – our happiness, safety, comfort, and the economy. We can have our cake and eat it, too!

Climate change impacts our neighbors, our communities, our economy, our heritage.
Green energy addresses both financial and environmental issues.

It’s all about the green.

The recent one-two punch of Covid-related economic impacts and recent disruptions to the international natural gas market sent gas and electricity rates through the roof during the winter of 2022-23. Ouch

We understand the value of a dollar, and the security and economic implications of reliance on foreign energy sources. We know that sometimes boring things like insulation and flipping the lights off are fine defenses against a world gone mad.

We get Green, in its financial and environmental shades.

We can help.

We understand that the transition to a sustainable energy future must be made with care to avoid impacting service. Despite the urgency, it will be gradual. Resources must be replaced, the transmission/distribution system must be updated. We understand that this process entails policy, siting, economic, and other significant challenges.

 We earned our chops at large energy consultancies. Entrepreneurs at heart, we jumped at the opportunity to launch Abacus Energy Works℠. We loved our work and colleagues, our clients and their partners and customers.

We are thrilled to continue partnering with them, but to also serve the “little guys” that may not have been a great fit for our former employers.

Supporting clients through analysis, research and deep industry knowledge

Woman Owned & Operated Small Business

Abacus Energy Works℠, LLC is a woman owned and controlled small business.

Our application for the Women’s Business Enterprise National Council (WBENC) certification as a woman-owned and -operated business is pending.

Our application to the United States Small Business Administration (SBA) for certification as a woman-owned business through the Woman-Owned Small Business Federal Contract (WOSB) Program is in process.


Abacus Energy Works℠, LLC is a member of several local and international organizations, including AESP, the Association of Energy Services Professionals, BIANH, the Business and Industry Association of New Hampthire, and CENH, Clean Energy New Hampshire. 


Abacus Energy Works℠ partners with various companies and professionals to best staff your project. Our founders and principals are Sharon Mullen and Paul Higgins. 

Sharon Mullen, President

Sharon Mullen, President

In 2011 Sharon was confirming a career transition to energy from a product development and e-commerce business she founded. She dove in, serving in leadership roles at AESP and on the Board of Directors for the Technology Association of Georgia’s Smart Energy Society.

She recalls the 2012 DistribuTECH that opened with keynote Ben Stein saying, “Electricity is what separates us from cavemen.” Right, but let’s make it sustainable.

Combining the audacity of someone new to the field with respect for who and what went before, she united trade organizations to partner on industry-wide studies, forged relationships to advance integration of demand side management (IDSM), and developed best practices to engage “hard to reach” small businesses.

She has kept that audacious streak alive, recently focused on making ASHRAE facility audit reports more readable to non-engineers responsible for approving projects.

Sharon has led evaluations of utility programs across North America. She delivers actionable results in an easy-to-understand way. A subject matter expert in savings attribution, net-to-gross, program delivery and operations, she contributes to the Illinois TRM.

She has published numerous articles about energy and presented and moderated panels at national conferences.

Sharon was elected to her town’s Planning Board where she works on practical responses to climate change and sea level rise in her coastal community.

In her free time you can find Sharon in the garden, kitchen, a local brew pub, at a concert, theater, or museum, reading or cheering on the Celtics and Patriots.

Sharon has a BS in Business Administration and Communications from the University of New Hampshire, a MA in History from Tufts University, and an MBA from the University of Florida.

Email Sharon

Connect with Sharon

Paul Higgins, Vice President

Paul Higgins, Vice President

Paul began his career as an energy consultant in 1998 at Christensen Associates in Madison, WI. His first project was evaluating a demand response pilot for SoCal Edison.

Since then, he has evaluated a wide range of demand-side management and energy efficiency programs for electric and natural gas utilities throughout North America, including traditional commercial, industrial and residential customer incentive programs, and novel “2.0” programs that rely on new technology or social psychology rather than ratepayer-funded incentives.

Paul advises and supports electric utility clients on the design, implementation, and evaluation of their grid modernization pilots and programs, such as voltage-var optimization (VVO).

While less familiar than customer-facing programs, VVO has a big impact: a Midwest client’s program produced 180,000 MWh of net energy savings in 2022, eliminated more than 127,000 metric tons of carbon emissions, and lowered the average customer bill by roughly 2 percent.

Paul also worked at KEMA (now DNV) and Navigant (acquired by Guidehouse in 2019). He is a subject matter expert in econometrics and statistics, measurement and verification of program impacts, and quantitative modeling and forecasting.

As co-chair of AESP’s Tools & Technology Topic Committee he helped plan national conferences. He’s presented papers and moderated panels at conferences sponsored by AESP, the International Energy Program Evaluation Conference (IEPEC), and the Wisconsin Public Utility Institute (WPUI).

Paul has a BA in Economics from the University of California, an MA in Economics from Tulane University, and has completed additional post-graduate coursework at Cornell University and the University of Washington.


Email Paul

Connect with Paul