Terms & Definitions
Learn more about our frequently used solar terms and acronyms.
A
Agrivoltaics
Refers to the practice of simultaneously co-locating solar energy generation and agricultural production on the same land.
ATI
Array Technologies - solar tracking solutions
B
BAFO
Best and final offer
BESS/BSS/BS
Battery Energy Storage System (Synonyms/AKA - Batteries, Solar+, Solar-Plus, BESS/BS/BSS/ESS, etc.)
BMP
Best management practices
BOC
Bill of materials
BOM
Beginning of Construction
C
CM
Corrective Maintenance (An Operations & Maintenance Service)
CO
Change Order - change to the scope of work or material terms inside of an agreement
COD
Commercial Operation Date
COI
Certificate of Insurance
CPRG
Climate Pollution Reduction Grants
CUP
Conditional Use Permit
D
DAS
Data Acquisition System (I.E. - Monitoring System)
DCS
Distributed Control Systems
DER
Distributed Energy Resources: a small-scale energy source that can be used to generate, store, and distribute electricity. DERs are often located near where electricity is used, such as on rooftops or behind a meter on a customer's property.
DG
Distributed Generation - the process of generating electricity close to where it will be used, rather than at a centralized power plant. DG systems can power homes, businesses, and even entire communities
E
EIA
US Energy Information Administration
EMR
Experience Modification Rate - Workers Comp experience rating
EOI
Expression of Intent
EOR
Engineer of Record - typically a third party
EPCA
Engineering Procurement Construction Agreement; Synonyms - Contract, Agreement, Services Agreement, etc.
ESS
Energy Storage System (Synonyms/AKA - Batteries, Solar+, Solar-Plus, BESS/BS/BSS/ESS)
F
FERC
Federal Energy Regulatory Commission
G
GW
gigawatts
I
IFC
Issued For Construction
IPP
Independent Power Producer - which refers to a company that owns and operates facilities to generate electricity, but is not a public utility, meaning they are separate from the main electricity grid operator and sell their produced power to utilities or directly to consumers through power purchase agreements (PPAs)
IRA
Inflation Reduction Act
ISO
Independent System Operators
ITC
Investment Tax Credit - The Section 48 commercial credit can be applied to both customer-sited commercial solar systems and large-scale utility solar farms. The rate is effectively at 30% until Treasury issues guidance on new wage and apprenticeship standards. Two months later, the rate will be at 6%, with an additional 24% (for a total of 30%) available for meeting these new labor standards.
K
kW
kilowatts
L
LD
Liquidated Damages
LNTP
Limited Notice to proceed
LOI
Letter of Intent
M
MVXFMR
Medium voltage transformer
MW
megawatts
N
NoMP
Notice of Material Procurement
NPPD
Nebraska Public Power District
NTP
Notice to Proceed
O
O&M
Operations and Maintenance
OER
Client - One Energy Renewables
OPPD
Omaha Public Power District
P
P&P Bond
Performance & Payment Bond
PACE
Powering Affordable Clean Energy - Program from USDA and made possible by Biden's IRA - Agriculture Secretary is Tom Vilsack
Peak Shaving
In solar refers to the practice of reducing energy consumption during periods of high electricity demand, often using stored solar energy to offset reliance on the grid during these times
PMI
Preventative Maintenance and Inspection - O&M term
POI
Point of Interconnect(ion)
PPA
Power Purchase Agreement - a contract in which a customer agrees to buy electricity generated by a renewable energy system from a third-party developer. The developer is responsible for installing, operating, and maintaining the system.
PR
Performance Ratio (PR) test
PUC
Public Utility Commission
PV
Photovoltaic
PVsyst
PVsyst is a widely used simulation software package in the solar energy industry, designed for modeling and analyzing the performance and design of photovoltaic (PV) systems, including grid-connected, stand-alone, and pumping systems.
R
REC
Renewable Energy Credits (or Certificates)
RFI
Request for information
RPCS
RP Construction Services (RPCS) and Array Technologies (ATI) are partners in the solar tracker industry - Rebranded/named as "Ampacity" as of April 2025
RRR
Repair/Replace/Retrofit - Services for rectifying deficient conditions or increasing the productivity of an existing solar energy generation facility (or other).
S
SCADA
Supervisory Control and Data Acquisition, and it's a system that monitors and controls industrial processes, machines, and plants. SCADA systems use software and hardware to collect, analyze, and display data in real time
Solar +
Solar plus battery
SOQ
Statement of Qualification
SPP
Southwest Power Pool - This is an independent system operator (ISO) and regional transmission organization (RTO) for the electric grid in the central U.S., ensuring reliable and affordable electricity by coordinating power flow and managing the wholesale market, according to Federal Energy Regulatory Commission (.gov) and spp.org.
SWPPP
Stormwater Pollution Prevention Plan
T
TFCA
Transmission Facility Construction agreement
U
UL / UL Test Cert
PV Module Certification - Information, durability, adhesion, testing, annual inspection - Underwriters Laboratories (UL) are most widely known for standards in electrical products OR UL Certification
Unit Rate
Hourly metric on time to implement
V
VM
Vegetation Management (or "Maintenance")
W
WIP
Work in Progress
X
XFMR
Transformer