Energy efficiency stocks are publicly traded companies using a wide range of technologies to deliver the same energy services using less energy in the built environment. This includes efficient lighting such as LED lighting stocks, insulation, efficient motors, efficient appliances and appliance replacement services, sensor and control technologies, the internet of things, efficient power conversion and generation, and energy efficient design, construction, and retrofits.

See the list of efficient vehicle stocks and alternative transportation stocks for companies reducing energy used in transportation.

Energy efficient fan from and a light shelf  are innovative strategies energy efficient design and construction firms use to lower energy use in commercial spaces.

Acuity Brands (NYSE:AYI)
AIXTRON SE (AIXA.DE)
Ameresco, Inc. (AMRC)
Appliance Recycling Centers of American (ARCI)
Aspen Aerogels, Inc. (ASPN)
Carmanah Technologies Corporation (CMH.TO, CMHXF)
ClearSign Combustion Corporation (CLIR)
Compagnie de Saint-Gobain S.A. (SGC.PA, CODGF)
Cree, Inc. (CREE)
Energy Focus (EFOI)
Energy Recovery (ERII)
EPISTAR corporation (2448.TW)
FLIR Systems, Inc. (FLIR)
Hannon Armstrong (HASI)
Kingspan Group plc (KGP.L)
Koninklijke Philips N.V. (PHG)
Lighting Science Group Corporation (LSCG)
Lime Energy (LIME)
LSB Industries, Inc. (LXU)
LSI Industries Inc. (LYTS)
Neo-Neon Holdings Limited (1868.HK)
OMRON Corporation (6645.T, OMRNF, OMRNY)
Orion Energy Systems, Inc (OESX)
Owens Corning (OC)
PFB Corporation(PFB.TO, PFBOF)
Power Integrations, Inc. (POWI)
Revolution Lighting Technologies, Inc. (RVLT)
ROCKWOOL International A/S (ROCK-B.CO, ROCK-A.CO, RKWBF)
Rubicon Technology, Inc. (RBCN)
SemiLEDs Corporation (LEDS)
Universal Display (OLED)
Veeco Instruments Inc. (VECO)
Zumtobel Group (ZMTBF, ZAG.VI)