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Acronym Full Name Description Function Notes
ACH Air Changes Per Hour Measurement related ventilation Used to quantify fresh air in buildings Determine air infiltration = how tight or leaky the building envelope is.
AMI Advanced Metering Infrastructure Integrated system of smart meters, communications networks, and data management systems Enables two-way communication between utilities and customers
AQMD Air Quality Management District
BPA Building Performance Association Member organization Represents EE industry Merger of HPC, HEM, EFN and BPI
BPI Building Performance Institute Education and training Certifications Part of BPA
BRO Behavior, Retro Commissioning, and Operational Efficiencies EE savings, not directly from equipment Considers impacts of complete solutions Much of this is related to behavior
BTU British Thermal Unit A measure of heat  energy Determine heating capacity or needs Roughly equal to the heat output of one wooden match
CAISO California Independent Systems Operator Independent grid operator Load manager for the CA electrical grid Predicts demand and directs resources across the 26k miles of electrical distribution lines in CA
CARB California Air Resources Board Regulatory body Oversees Air Quality Districts Responsible for protecting the public from the harmful effects of air pollution
CCA Community Choice Aggregator A local government entity that provides consumers an option to IOUs Provide the public choice over their energy sources AB 117 passed in 2002 allowing CCAs - also known as CCEs
CCE Community Choice Energy A local government entity that provides consumers an option to IOUs Provide the public choice over their energy sources AB 117 passed in 2002 allowing CCEs - also known as CCAs
CEC California Energy Commission State agency Responsible for building codes and enforcement Located in Sacramento
CFM Cubic Feet per Minute A measurement of flow Quantify volume Can be applied to liquids and gasses
CFM25 CFM @ 25 Pascals A reference pressure measurement Standard pressure reference for Air Duct testing Allows you to quantify how leaky duct systems are
CFN50 CFM @ 50 Pascals A reference pressure measurement Standard pressure reference used for Blower Door testing Allows you to quantify building envelope (shell) infiltration (air leaks)
CH4 Methane Natural occurring gas Main component of Natural Gas GWP of 28-36
CO2 Carbon Dioxide Natural occurring gas Used as baseline in GHG conversations
CPUC California Public Utilities Commission State agency Regulatory body Provide oversite of investor owned utilities (regulated monopolies). Main office in SF
DER Distributed Energy Resources Electricity production and storage from small grid connected sources Simple term to describe non-utility produced electricity Renewables, Wind, solar, etc
DR Demand Response Remote control of appliances in response to loads Third party controls to reduce load during peak demand A grid loss management tool. Typically controlled by a Utility to reduce loads during high demand periods
EE Energy Efficiency Short for Energy Efficiency Often used in policy conversations related to EE
EFCA Efficiency First California Member organization Represents EE and Clean Energy Industries Was a chapter of EFN - which merged into BPA in 2019
EFN Efficiency First National Member organization Represents EE Merged with 3 other organizations to form BPA
EM&V Evaluation, Measurement, and Verification Incentive program analysis Used to determine effectiveness of incentives Often used after a program has been in operation to determine effectiveness
GHG Green House Gas Gas that contributes to global warming Identify gases causing global warming CO2 ia s GHG, Methane and many others are too
GPM Gallons per minute Measurement of the volume of fluid moved over time Measure flow of liquids Typically used in reference to water but applies to all liquids
GSR Gas Service Representative Gas Utility employee Field technician Primary responder for Natural  Gas related issues
GWH Giga Watt Hours
GWP Global Warming Potential A scale used to compare impacts of GHG gasses Used to measure impacts on ozone layer CO2 has GWP of 1, Methane GWP 28-36,
HPSH Heat Pump Space Heating Using a heat pump to provide heat Electric heating option Most efficient way to heat building
HPWH Heat Pump Water Heating Using a heat pump to provide hot water Electric water heating option Most efficient way to heat water
IAQ Indoor Air Quality A measurement of particulates and other factors Used as a metric to determine health impacts of indoor air Humidity, ventilation, particulates, combustion by products, off gassing, are all factors that affect IAQ
IOU Investor Owned Utility Regulated Monopolies Provide Natural Gas or Electricity There are 4 IOUs in California
IR Infrared Spectrum of light. Outside the range of human vision IR cameras can be used to see heat Often used as part of an Energy Audit
IWR Inches of water column
KW Kilo Watt
KWH Kilo Watt Hours
NEBs Non-Energy Benefits Secondary benefits from EE upgrades Support EE as having more value than dollars saved Typically these are - Comfort, Health, Durability, Safety, IAQ, etc.
PA Pascal A measurement of pressure Used by many building diagnostic tools The pressure a pad of butter applies to a table. Metric equivalent of PSI
PG&E Pacific Gas & Electric Utility Natural Gas and Electricity 1 of 4 CA - IOUs, Largest utility in the country
PSI Pounds Per Square Inch A measurement of pressure Used to measure pressure Measures the pressure per square inch in pounds
PV Photo Voltaics Solar panels that produce electricity Site generated power source Can be used to supply all of the buildings energy needs - see ZNE
REN Regional Energy Network
RH Relative Humidity
SCE Southern California Edison Utility Electric only 3 of 4 CA - IOUs
SCG Southern California Gas Company Utility Natural Gas 2 of 4 CA - IOUs, Owned by Sempura - Frequently referred to as So Cal Gas
SDG&E San Diego Gas and Electric Utility Natural Gas and Electricity 4 of 4 CA - IOUs, Owned by Sempura
TOU Time Of Use Electric rate structure Encourages reduced electricity use during peak periods to manage load on the grid Rates go up during peak grid load, typically 4pm to 9pm
TRC Total Resource Cost EE rebate program cost evaluation tool A formula used to determine the cost effectiveness of EE programs A TRC of 1.0 = One dollar saved for every dollar spent on running the program
TSB Total System Benefit EE - Considers other benefits of upgrades Used to value all of the savings from EE Non-energy benefits and avoided costs from not using energy - Negawattts
VRF Variable Refrigerant Flow A type of compressor used in heat pump and air conditioning systems Matches output to load Much more efficient than single speed or two stage systems
ZNE Zero Net Energy A term for a building that produces as much energy as it uses Increases resilience and does not rely on 3rd party energy sources Many ZNE building are still connected to the grid to provide energy when the PV can't meet all of the buildings needs