Subject Index - Technology-Related Terms
"Bandgap" is one word.
"Baseload" is one word when used as a noun or adjective.
When used as a noun, “black start” is two words. Hyphenate “black-start” when it is used as a modifier. Avoid using as a verb if possible.
This building has black-start capabilities.
BOS stands for balance of systems (not system).
Do not use a hyphen in most chemical expressions, even when the terms are used as modifiers.
hydrogen ion activity
Use a hyphen after prefixes when that's the standard for certain chemical formulas.
Use a hyphen to indicate mixtures or combinations.
"Cleantech" is spelled as one word. It is not hyphenated, and the "t" is not capitalized. The word "cleantech" is typically used in reference to investments in sustainable technologies, including renewable energy and energy efficiency. Don't use as a shortened form of "clean technology" in other references.
The term is "close-spaced sublimation," not "closed-space sublimation."
Concentrating solar power (CSP) captures the sun’s heat and uses the thermal energy to produce electricity (e.g., via a steam turbine).
CPV (concentrating photovoltaics) uses lenses to intensify the sunlight striking PV cells, which enhances the cells' electricity production.
Use a slash rather than a hyphen.
The preferred term is "enhanced geothermal system." It is also sometimes referred to as an "engineered geothermal system."
“High-performance computing” should be hyphenated. The abbreviation HPC can be used to refer to high-performance computing but should not be used to mean high-performance computer. However, the term "supercomputer" may be used in place of high-performance computer.
This phrase contains no hyphens.
This term refers to a cell composed of semiconducting materials from Group III (e.g., gallium) and Group V (e.g., arsenic) elements of the periodic table.
Inverters convert direct current to alternating current.
This term is preferred over "tandem solar cell."
When used as a noun, “net zero” is two words. It is also two words when referencing the Net Zero Labs program. Hyphenate “net-zero” when it is used as a modifier.
We are close to achieving our emissions goal of net zero.
The goal is to achieve net-zero emissions.
The NREL attribution statement, which recognizes NREL's affiliation with the U.S. Department of Energy and the Alliance for Sustainable Energy, is required on all NREL publications. In addition, note that a period is used on the "sentence" version of the statement.
"Photovoltaics" is a singular noun. "Photovoltaic" is an adjective. The acronym PV can be a noun or an adjective, but do not pluralize it.
Only capitalize "renewable portfolio standard" when a state name precedes it.
Use capital letters for "Smart Grid" when referring to the overall goal or concept and lowercase letters for "smart grid" when referring to current implementations or when used as an adjective.
Use a slash rather than a hyphen to designate solar cell interfaces or layers.
Define in outreach publications as "the percentage of sunlight striking a solar cell that is converted into electricity." A definition is often unnecessary in technical publications.
This term is interchangeable with "photovoltaic power," "PV power," or "PV electricity."
The correct term is "systems integrator," not "system integrator."
Unless your profession, technical field, or scientific discipline specifies something different, use the abbreviations in NREL's list of technical abbreviations or the National Institute of Science and Technology's Guide.
Hyphenate. Don't spell as one word.
Use the term to indicate an energy-efficient building where, on a source energy basis, the actual annual delivered energy is less than or equal to the on-site renewable exported energy. Similar terms include zero energy campus, zero energy portfolio, and zero energy community.