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Solar Energy Wiki

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250 concepts · 176 concept relationships · counts derived from the ontology registry

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Published concepts 49

  • Electricity pricing is the set of prices and rate structures used to charge customers for electricity service.

    GS-CONCEPT-011 · Grid · Source event date unavailable
  • Net meteringPublished

    Net metering is a billing mechanism that credits a customer for eligible electricity exported to the grid.

    GS-CONCEPT-012 · Grid · Source event as of February 1, 2021
  • Net billingPublished

    Net billing is a billing arrangement that values electricity exported to the grid separately from electricity imported from the grid.

    GS-CONCEPT-013 · Grid · Source event as of February 1, 2021

  • A time-of-use electricity rate charges different prices for electricity during predefined periods within a day.

    GS-CONCEPT-014 · Grid · Source event as of July 14, 2020

  • Grid interconnection is the technical and administrative process for connecting a customer energy system to an electric utility distribution system under applicable requirements.

    GS-CONCEPT-054 · Grid · Source event as of September 7, 2021

  • An interconnection agreement is the controlling agreement between the system owner or customer and the utility for an approved connection and its operating conditions.

    GS-CONCEPT-055 · Grid · Source event as of May 16, 2024

  • Permission to operate is a utility's authorization for an interconnected customer system to begin operating under the utility's stated conditions after required project steps are complete.

    GS-CONCEPT-056 · Grid · Source event date unavailable

  • A photovoltaic export limit is a configured or contractual maximum on power delivered from a customer photovoltaic system to the utility grid.

    GS-CONCEPT-057 · Grid · Source event as of September 30, 2020

  • A non-export photovoltaic system is designed or controlled so electricity is not intentionally delivered from the customer site to the utility grid under the applicable interconnection arrangement.

    GS-CONCEPT-058 · Grid · Source event as of September 30, 2020

  • A distributed energy resource is a comparatively small generation, storage, demand-response, efficiency, thermal-storage, or similar resource connected on a distribution system or behind a customer meter.

    GS-CONCEPT-059 · Grid · Source event as of September 28, 2020

  • Behind-the-meter generation is electricity generation located on the customer side of the utility billing meter or other defined customer-grid boundary.

    GS-CONCEPT-060 · Grid · Source event as of September 28, 2020

  • An electricity fixed charge is a bill charge determined independently of the customer's metered kilowatt-hour consumption during the billing period under the applicable rate schedule.

    GS-CONCEPT-061 · Grid · Source event as of May 13, 2020

  • An electricity demand charge is the portion of an electric-service bill based on the customer's measured or calculated maximum capacity usage under the applicable rate schedule.

    GS-CONCEPT-062 · Grid · Source event as of May 13, 2020

  • A tiered electricity rate applies different energy prices to defined blocks of electricity consumption within a billing period.

    GS-CONCEPT-063 · Grid · Source event as of September 1, 2009

  • An export compensation rate is the monetary or bill-credit value assigned to eligible electricity delivered from a customer energy system to the grid under a specified program or tariff.

    GS-CONCEPT-064 · Grid · Source event as of February 1, 2021

  • An avoided-cost rate is a value based on costs a utility or system avoids because a specified increment of electricity or service is supplied by another resource.

    GS-CONCEPT-065 · Grid · Source event as of February 1, 2021

  • The point of common coupling is the point where an SDG&E customer generation facility connects to the utility's distribution system as defined by Electric Rule 21.

    GS-CONCEPT-185 · Grid · Source event as of August 6, 2023

  • The point of interconnection is the physical point where a generating facility connects to the SDG&E distribution system under the Rule 21 definition.

    GS-CONCEPT-186 · Grid · Source event as of August 6, 2023

  • Utility interconnection facilities are the facilities used to interconnect a generating facility under Rule 21, which may be integral to or separate from that facility.

    GS-CONCEPT-187 · Grid · Source event as of August 29, 2023

  • The utility distribution system is the portion of SDG&E's electric system used to distribute electricity as defined by Electric Rule 21.

    GS-CONCEPT-188 · Grid · Source event as of August 29, 2023

  • Nominal operating voltage is an editorial compound label used here to discuss Rule 21's defined term Nominal; it is not itself a defined Rule 21 tariff term.

    GS-CONCEPT-189 · Grid · Source event as of August 29, 2023

  • Voltage regulation is the reliability function of maintaining voltage within an acceptable range on an electric power system, as described in FERC's Reliability Primer.

    GS-CONCEPT-190 · Grid · Source event as of October 9, 2024

  • Reactive power is the portion of electricity that establishes and sustains the electric and magnetic fields of alternating-current equipment.

    GS-CONCEPT-191 · Grid · Source event date unavailable
  • Power factorPublished

    Power factor is the ratio of real power in kilowatts to apparent power in kilovolt-amperes for a given load and time.

    GS-CONCEPT-192 · Grid · Source event date unavailable

  • Volt-VAR control is a smart-inverter control represented by a curve relating voltage and reactive-power settings in NREL's described study.

    GS-CONCEPT-193 · Grid · Source event as of January 4, 2023

  • Volt-Watt control is a smart-inverter control represented by a curve relating voltage and real-power settings in NREL's described study.

    GS-CONCEPT-194 · Grid · Source event as of January 4, 2023

  • Frequency-Watt control is a real-power-versus-frequency curve described in NREL's technical report.

    GS-CONCEPT-195 · Grid · Source event as of July 2016

  • Ride-through capability describes a DER capability for voltage or frequency abnormal conditions in NREL's technical report.

    GS-CONCEPT-196 · Grid · Source event as of July 2016

  • Anti-islanding protection is the Rule 21 tariff concept addressing an unintentional island, without establishing compliance for any specific device.

    GS-CONCEPT-197 · Grid · Source event as of August 29, 2023

  • Smart-inverter function profile is GeoStellar's editorial grouping for the function-related settings listed in SDG&E Rule 21 Table Hh-4; it is not a Rule 21-defined national profile.

    GS-CONCEPT-198 · Grid · Source event as of August 29, 2023

  • Smart-inverter commissioning settings is GeoStellar's editorial term for applicable settings verified through the Rule 21 commissioning-testing process.

    GS-CONCEPT-199 · Grid · Source event as of August 29, 2023

  • An interconnection application is the Rule 21 application and interconnection request that starts the utility's review process.

    GS-CONCEPT-200 · Grid · Source event as of August 29, 2023

  • An interconnection study is a Rule 21 process for evaluating distribution-system impacts, facilities, and upgrades for an interconnection request.

    GS-CONCEPT-201 · Grid · Source event as of August 29, 2023

  • Hosting capacity is planning information from integration-capacity analysis, which Resolution E-5440 addresses through utility remediation plans and baseline reporting.

    GS-CONCEPT-202 · Grid · Source event as of April 9, 2026

  • Export control mode is an interconnection configuration that uses Rule 21 non-export or limited-generation-profile options to constrain grid export.

    GS-CONCEPT-203 · Grid · Source event as of July 9, 2025
  • Smart meterPublished

    A smart meter is commonly discussed within EIA's advanced-metering range, from basic hourly interval meters to real-time meters with two-way communication.

    GS-CONCEPT-204 · Grid · Source event as of October 20, 2023

  • Advanced metering infrastructure is a utility-reported technology category in EIA-861 Schedule 6D.

    GS-CONCEPT-205 · Grid · Source event date unavailable

  • In SDG&E Rule 1, an interval meter records usage in 15-minute-or-less intervals for that tariff definition.

    GS-CONCEPT-206 · Grid · Source event as of April 1, 2026
  • Net loadPublished

    In EIA's battery-storage analysis, net load is system load minus nondispatchable wind and solar generation within that analysis boundary.

    GS-CONCEPT-207 · Grid · Source event date unavailable

  • A household load profile is an hourly or subhourly time series of electric-load values in kilowatts for a building.

    GS-CONCEPT-208 · Grid · Source event date unavailable
  • Load controlPublished

    Direct load control is EIA's narrow demand-side-management category in which utility system-operator control can interrupt consumer load at annual peak.

    GS-CONCEPT-209 · Grid · Source event date unavailable

  • Demand response programs involve temporary changes or reductions in electricity use in response to conditions or incentives.

    GS-CONCEPT-210 · Grid · Source event date unavailable

  • A Distributed Energy Resource Provider is an entity authorized by a DER Aggregator to act on its behalf in CAISO markets.

    GS-CONCEPT-211 · Grid · Source event as of May 29, 2026

  • A Distributed Energy Resource Aggregation is a group of distributed energy resources represented in CAISO markets by a DER Aggregator.

    GS-CONCEPT-212 · Grid · Source event as of May 29, 2026

  • FERC says ancillary services help keep the grid stable and resilient by maintaining frequency, reducing voltage fluctuations, helping prevent outages, and responding to sudden changes.

    GS-CONCEPT-213 · Grid · Source event date unavailable

  • Frequency regulation service uses automatic short-term changes in output or demand in response to balancing-authority signals.

    GS-CONCEPT-214 · Grid · Source event as of January 17, 2024

  • Voltage support uses generator reactive-power production to maintain transmission-system voltages within required ranges.

    GS-CONCEPT-215 · Grid · Source event date unavailable

  • Critical peak pricing uses higher prices during a limited number of critical hours.

    GS-CONCEPT-216 · Grid · Source event as of January 17, 2024

  • Real-time pricing uses prices that reflect immediate costs and change frequently.

    GS-CONCEPT-217 · Grid · Source event as of January 17, 2024
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