Microgrids range from small community systems to multi-megawatt installations serving homes, commercial buildings, schools, clinics, and hospitals. The statistics below distinguish observed deployments from engineering rules of thumb, project estimates, scenario models, and a single-site reliability study.
Key Microgrid Statistics
The most useful headline figures span deployment, scale, finance, emissions, economics, and reliability:
- 237 operational microgrids were recorded in the United States in August 2020.
- 2.4 GW of total capacity was recorded across U.S. operational microgrids in August 2020.
- A 20% building energy-bill reduction was reported by a Sempra downtown San Diego office microgrid by 2020.
- 5 kW of generation was paired with one home in DOE’s 2024 New England sizing guidance.
- 250 kW of generation was paired with 100 homes or three retail buildings in DOE’s 2024 New England guidance.
- 1.5 MW of generation was paired with 600 homes in DOE’s 2024 New England sizing guidance.
- $2 million to $5 million per MW was the average continental U.S. microgrid development range in a 2018 NREL study reproduced in 2024 DOE guidance.
- 75% of illustrative upfront cost represented equipment and installation in DOE’s 2024 hypothetical-project breakdown.
- 15 MW of photovoltaic generation was specified for the Viejas microgrid project in California at its September 2024 financing announcement.
- 70 MWh of long-duration storage was specified for the Viejas project at financing close in September 2024.
- 21,500 MWh of annual generation was expected for the Viejas microgrid in the project estimate.
- 9,009 metric tonnes of annual CO2e savings were expected for the Viejas microgrid in the project estimate.
- 250 construction jobs were expected from the Viejas project in its financing-close estimate.
- $72.8 million was the DOE-reported partial loan guarantee for the Viejas project in September 2024.
- More than $13 million per year was the modeled net benefit of a 10 MW incremental microgrid investment in a 2019 Israeli scenario.
- Approximately $260,000 per year was the modeled net benefit in that Israeli sensitivity case when local economic benefits were excluded.
- 100 outages and 51.2 hours of downtime were recorded by the Obayantor microgrid in Nigeria in 2018.
- 0.998 availability was recorded at Obayantor in 2015 and 2019.
Contents
- Key Microgrid Statistics
- U.S. Microgrid Deployment Statistics and Capacity Trends
- Microgrid Generation Capacity and Connected-Load Data
- Microgrid Development Costs and Cost Breakdown
- Renewable Microgrid Scale, Storage, and Emissions
- Microgrid Economic Benefits and Investment
- Microgrid Reliability and Outage Statistics
U.S. Microgrid Deployment Statistics and Capacity Trends
The U.S. deployment snapshot comes from the Department of Energy and ICF’s operational database, rather than a forecast or a complete global inventory. As of August 2020, the database counted 237 operational microgrids in the United States with 2.4 GW of total capacity.
DOE, Smart Grid System Report 2020
That national count provides scale, while a commercial example shows one possible outcome. A Sempra downtown San Diego office microgrid had reduced the building energy bill by 20% by 2020 using a PMU-based optimization controller; DOE noted that the provider found similar results in comparable microgrids, but this remains a single commercial demonstration rather than a national average.
The deployment figures should therefore be read as a dated U.S. operational snapshot. They do not establish how many systems were under construction, how many existed outside the United States, or how every microgrid performed financially.
Microgrid Generation Capacity and Connected-Load Data
DOE’s 2024 guidance gives rough peak-load pairings for New England assumptions. These are estimates, not measured operating results, and assume storage or thermal generation.
| Generation capacity | Illustrative connected load | Measurement context |
|---|---|---|
| 5 kW | 1 home | DOE 2024 New England rule of thumb |
| 25 kW | 10 homes | DOE 2024 New England rule of thumb |
| 250 kW | 100 homes or 3 retail buildings | DOE 2024 New England rule of thumb |
| 500 kW | 200 homes or 5–6 retail buildings | DOE 2024 New England rule of thumb |
| 500 kW | 1 supermarket, health clinic, or small school | Alternative facility example |
| 1.5 MW | 600 homes or 15–20 retail buildings | DOE 2024 New England rule of thumb |
| 1.5 MW | 4 supermarkets, 4–5 health clinics, 2–3 schools, or 1 hospital | Alternative facility examples |
The facility examples are alternatives, not simultaneous loads. Because the guidance is based on rough peak-load assumptions, it should not be presented as a national conversion rate between megawatts and buildings.
Microgrid Development Costs and Cost Breakdown
A 2018 NREL study reproduced in DOE’s 2024 guidance estimated that continental U.S. microgrids averaged $2 million to $5 million per MW to develop. The figures are nominal 2018 dollars and were not adjusted for inflation.
DOE also provides an illustrative breakdown for a hypothetical project:
| Upfront cost category | Illustrative share | Scope |
|---|---|---|
| Equipment and installation | 75% | Hypothetical microgrid |
| Construction management | 15% | Hypothetical microgrid |
| Design and engineering | 10% | Hypothetical microgrid |
The three listed categories account for 100% of the hypothetical project’s upfront cost. This is an arithmetic total of DOE’s illustrative shares, not a universal project average or a cost forecast for a particular site.
Project costs can vary with generation technology, storage duration, controls, interconnection requirements, site conditions, and the loads being protected. Those drivers are not quantified in the supplied cost breakdown, so the reported range and percentages should remain separate from any site-specific budget.
Renewable Microgrid Scale, Storage, and Emissions
The Viejas microgrid illustrates the scale of a planned renewable project in California. At financing close in September 2024, the project was designed with 15 MW of photovoltaic generation and 70 MWh of long-duration battery storage.
DOE lists expected annual generation of 21,500 MWh and expected annual emissions savings of 9,009 metric tonnes of CO2e. Both are project estimates, not measured operating history.
| Viejas project measure | Reported figure | Status and period |
|---|---|---|
| Solar PV generation | 15 MW | Planned specification, September 2024 announcement |
| Long-duration storage | 70 MWh | Planned specification |
| Annual generation | 21,500 MWh | Expected project output |
| Annual emissions savings | 9,009 metric tonnes CO2e | Expected project benefit |
| Construction employment | 250 jobs | Expected project estimate |
| Partial loan guarantee | $72.8 million | DOE-reported September 2024 amount |
The project was also expected to support 250 U.S. construction jobs, while DOE reported a $72.8 million partial loan guarantee, including principal and capitalized interest at closing. These figures describe financing and expected project effects, not completed construction or measured generation.
Microgrid Economic Benefits and Investment
A peer-reviewed 2019 study modeled a 10 MW incremental microgrid investment in a representative Israeli electricity market. When reliability, avoided transmission and distribution, local economic, environmental, and social effects were included, the modeled net benefit could exceed $13 million per year.
Excluding local economic benefits, the modeled annual net benefit fell to approximately $260,000. Both values are scenario-model outputs under stated assumptions, not measured results across Israel or a general return for every microgrid.
The same study gives national utility context, which should not be confused with microgrid deployment:
- Israel Electric Corporation generation-capacity additions averaged 166 MW per year from 2008 through 2018.
- Israel Electric Corporation had 13,775 MW of installed capacity at the end of 2018.
- Total annual capital investment averaged approximately $1 billion per year since 2015.
- Approximately $400 million per year of that average capital investment was in generation.
These utility figures describe Israel Electric Corporation’s national system and investment context. They are not microgrid capacity, microgrid spending, or a direct comparison with the U.S. operational database.
Microgrid Reliability and Outage Statistics
A five-year field study measured one off-grid hybrid microgrid serving the Obayantor community in Edo State, Nigeria. The series uses the study’s definitions of outage frequency, downtime, mean time between failures, mean time to repair, and availability.
| Year | Outages | Downtime | MTBF | MTTR | Availability |
|---|---|---|---|---|---|
| 2015 | 9 | 3.58 hours | 379.839 hours | 0.428 hours | 0.998 |
| 2016 | 19 | 10.58 hours | 202.799 hours | 0.428 hours | 0.997 |
| 2017 | 40 | 37.27 hours | 240.433 hours | 0.936 hours | 0.997 |
| 2018 | 100 | 51.2 hours | 90.884 hours | 0.499 hours | 0.994 |
| 2019 | 34 | 16.3 hours | 224.139 hours | 0.499 hours | 0.998 |
The highest recorded outage count in this series was 100 in 2018, alongside 51.2 hours of downtime and 0.994 availability. The lowest outage count was 9 in 2015, when downtime was 3.58 hours and availability was 0.998.
The 2019 observation recorded 34 outages, 16.3 hours of downtime, 224.139 hours MTBF, 0.499 hours MTTR, and 0.998 availability. Because all five years describe one Obayantor system, these results should not be generalized to off-grid hybrid microgrids elsewhere or treated as a sector-wide reliability benchmark.