Five Companies Earn Industry-Leading Accreditation from the National Association of Energy Service Companies
Washington, DC, November 26, 2025 — The National Association of Energy Service Companies (NAESCO), the leading advocacy and accreditation association representing companies modernizing the nation's building infrastructure, announces the re-accreditation of five companies. These companies have demonstrated the highest levels of professionalism, technical expertise, and ethical standards, making them exemplary partners for building infrastructure and energy-efficiency projects.
NAESCO's rigorous accreditation process involves a comprehensive evaluation of a company's technical and managerial competencies. Three categories of accreditation are offered: Energy Service Provider (ESP), Energy Service Company (ESCO), and Energy Efficiency Contractor (EEC).
All applications are evaluated by an independent committee comprised of industry experts. This process guarantees a thorough assessment of applicants' fundamental skills and business methodologies. The committee looks at criteria such as the precise nature of the applicant's business, the range of measures and services offered to customers, the availability of a performance-based project approach, and the applicant’s ethical business practice commitment.
Following the fall 2025 application review, five companies have successfully secured re-accreditation:
Energy Service Provider (ESP):
- Trane U.S. Inc.
Energy Service Company (ESCO):
- Georgia Power
- Southland
- The Efficiency Network, Inc. (TEN)
- Willdan Energy Services
NAESCO-accredited companies play a vital role in revitalizing aging infrastructure, building resilient energy systems, and driving down energy consumption.
Accreditation opportunities are available twice a year, in the spring and fall. NAESCO membership is a prerequisite for accreditation eligibility. The next application round will open in the spring. For more information about NAESCO and its accreditation process, please visit https://www.naesco.org/accreditation/.
See a full list of NAESCO-accredited companies: https://members.naesco.org/accredited-companies.
About The National Association of Energy Service Companies (NAESCO)
The National Association of Energy Service Companies (NAESCO) is the leading advocacy and accreditation organization for Energy Service Companies (ESCOs) and is dedicated to modernizing America’s building infrastructure. Uniting the energy service industry, NAESCO promotes favorable government policies, sponsors a rigorous accreditation program, provides training and education, and champions the interests of ESCOs across the nation.
ESCOs contract with private and public sector energy users to provide cost-effective energy efficiency retrofits across a wide spectrum of client facilities, from college campuses to water treatment plants. Effectively utilizing a performance-based contract business model, ESCOs have implemented more than $70 billion in comprehensive energy efficiency retrofit projects over the last three decades.
Learn more about NAESCO, its members, membership benefits, and the accreditation process at www.naesco.org, and follow NAESCO on Twitter (@NaescoNews) and LinkedIn (@naesco).
Media Contact:
Lucy Vernasco
On behalf of NAESCO