Top Energy Companies in Washington, DC (77)

The Sierra Club is the largest and most influential grassroots environmental organization in the United States. For over 130 years, it has worked to promote clean energy, safeguard community health, protect wildlife, and preserve wild places. Through grassroots activism, public education, lobbying, and legal action, the organization mobilizes millions of members and supporters to defend the right to a healthy...

Community Solar: The Easiest Way to Tap into Clean Energy We’re bringing clean energy to homeowners and communities everywhere, and helping them save up to 15% on electricity costs without installing rooftop solar panels.

Ameresco, Inc. (NYSE: AMRC) is an independent, integrated, comprehensive energy efficiency and renewable energy company that is building a sustainable future with public organizations and private enterprise throughout North America and the United Kingdom. Through energy audits, innovative engineering, utility-scale solar farms and deep energy retrofits, Ameresco applies forward-thinking technology to the challenges of controlling emissions, enhancing energy security and...

The Edison Electric Institute (EEI) is the leading industry association representing all U.S. investor-owned electric companies. EEI's mission is to drive policies, connect people, and provide strategic business insights that support member companies as they work to deliver safe, reliable, and affordable electricity to nearly 250 million Americans across all 50 states and the District of Columbia.

ACORE is a national nonprofit organization that unites finance, policy, and technology to accelerate the transition to a clean energy economy. It promotes investment in American clean energy infrastructure, development, and innovation.

Zeno Power is the leading developer of nuclear batteries that provide reliable, clean energy in frontier environments. By harnessing the heat from radioisotopes, Zeno’s batteries power critical missions on Earth, in space, and at sea.

Vanderweil is a mechanical, electrical, plumbing, fire protection, technology, sustainability, commissioning, and power engineering firm dedicated to providing customized and innovative engineering solutions through excellent client service. We have designed MEP/FP systems for buildings of all types and sizes, as well as cogeneration plants up to 50 MW, chilled water plants up to 100,000 tons, hundreds of miles of transmission...

SC&A is a small business that offers energy and environmental consulting to federal, state, and local government agencies and the private sector. Our expertise includes radiological and nuclear safety and security, climate adaptation, air quality, and emergency management and preparedness.

Inspiration is the first purpose-built EV solutions company. Our mission is to accelerate the electrification of transportation by partnering with fleet businesses to finance vehicles and deliver turnkey charging solutions to enable the rapid deployment of reliable, low-cost, zero-emissions EV fleets. Acting as a partner and system integrator, Inspiration designs and implements a custom solution that ensures every fleet electrification...

Altamira is your trusted partner in consulting, engineering, and field service support. The combination of our owner’s mentality, commitment to hearing your needs and concerns, and delivering with our proven processes help ensure project success. With our regulatory expertise and agile approach, we create working relationships that value compliance and deliver desirable outcomes that bolster your bottom line.

Cypress Creek Renewables believes solar energy makes the world safer, cleaner and better. Our team solves problems to successfully develop, build and operate solar facilities across the United States. With 12 gigawatts of solar energy developed in more than a dozen states, Cypress Creek Renewables is one of the country’s leading solar companies.

Steer is a global consultancy that provides strategic, commercial, and technical expertise to transport, cities, infrastructure, and energy projects worldwide. The firm helps clients navigate complex challenges by delivering powerful, evidence-based solutions. With a focus on planning and economic development, Steer supports government agencies and private sector organizations in enhancing their infrastructure and operational potential, ensuring sustainable and efficient outcomes...

The world no longer thinks of energy as a matter of supply and demand. Now it’s a space for innovation and partnership. With this transformation comes a responsibility to work with a smarter approach, new thinking informed by past experiences, and with stronger collaboration between regulators and innovators, old systems and new technologies. At AES, we partner with our organizations...

Deep Isolation offers an innovative solution to secure and dispose of spent nuclear fuel from commercial nuclear reactors. Our horizontal drill hole technology offers both safety and low cost. While the drilling technology is standard, Deep Isolation is the first company proposing to use this method for the safe isolation of spent nuclear fuel under a billion tons of rock...

Equinor is an international energy company headquartered in Stavanger, Norway, established in 1972. Its business combines oil and gas with a growing power business, supported by trading and market expertise. Equinor’s mission is to create value and build industry through its energy activities, with a broad international presence and a portfolio spanning conventional energy and power markets, with global operations.

Stratacomm is an independently-owned marketing communications agency specializing in transportation and energy communications, offering integrated solutions to drive change and achieve measurable client success.

WEG is a global electric-electronic equipment company and one of the largest electric motor manufacturers in the world, operating in the capital goods sector with solutions in electric machines, automation, and paints for various industries.

POET is the world's largest producer of ethanol and a leader in bioprocessing, focused on renewable energy and agricultural products.

Energy and Defence systems, purpose-engineered from first principles. 800+ installations, 25+ countries, 30+ years — designed and built entirely in-house.

Last Energy's mission is to decarbonize global energy production and increase access to clean, affordable power. We are a full-service developer of micro modular nuclear power plants with the goal of finally scaling nuclear by dramatically reducing the time and cost of construction