# Hecate Energy Highland LLC

PJM Solar Photovoltaic · https://askthegrid.com/assets/facilities/hecate-energy-highland-llc

Hecate Energy Highland LLC is a solar power facility with 300 MW of EIA-reported operating capacity in Highland County, Ohio, registered as EIA Plant ID 62670. Hecate Energy Highland LLC owns and operates the plant. Project filings list 744,549 solar panels and 84 inverters for the facility. Its grid role is utility-scale solar photovoltaic generation.

## Key facts

- Technology: Solar Photovoltaic
- Power capacity: 300 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM
- Interconnection voltage: 345 kV

## Source-backed facts

- Owner logo domain: hecateenergy.com — Hecate Energy - Projects · confidence: medium
- Identifiers: [{"value":"62670","system":"EIA plant ID"},{"value":"HIGHL","system":"EIA generator ID"},{"value":"PJM Interconnection","system":"ISO/RTO and balancing authority"},{"value":"ER22-123-000","system":"FERC market-based-rate docket"},{"value":"18-1334-EL-BGN","system":"Ohio Power Siting Board case"}] — Federal Register :: Hecate Energy Highland LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Identifiers: [{"value":"62670","system":"EIA plant ID"},{"value":"HIGHL","system":"EIA generator ID"},{"value":"PJM Interconnection","system":"ISO/RTO and balancing authority"},{"value":"ER22-123-000","system":"FERC market-based-rate docket"},{"value":"18-1334-EL-BGN","system":"Ohio Power Siting Board case"}] — 18-1334-EL-BGN:Highland Solar Farm · confidence: medium
- Description: Hecate Energy Highland LLC is a 300 MW solar photovoltaic plant in Highland County, Ohio, with one generating unit identified as HIGHL. The plant is operational, with its first unit online on May 1, 2024, and is located in the PJM Interconnection market and balancing-authority area. The Ohio Power Siting Board describes Highland Solar Farm as a 300-megawatt facility approximately 3.2 miles northwest of Mowrystown, Ohio. — 18-1334-EL-BGN:Highland Solar Farm · confidence: high
- Parties: [{"relationship":"Owner and developer","name":"Hecate Energy Highland LLC","official_url":"https://www.hecateenergy.com/"},{"relationship":"Operator","name":"Hecate Energy Highland LLC","official_url":"https://www.hecateenergy.com/"},{"relationship":"Purchaser/offtaker under renewable energy purchase agreements","name":"AEP Ohio","official_url":"https://www.aepohio.com/"}] — Hecate Energy - About Us · confidence: medium
- Identifiers.3: {"value":"ER22-123-000","system":"FERC market-based-rate docket"} — Federal Register :: Hecate Energy Highland LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Identifiers.4: {"value":"18-1334-EL-BGN","system":"Ohio Power Siting Board case"} — 18-1334-EL-BGN:Highland Solar Farm · confidence: high
- Parties.2: {"relationship":"Purchaser/offtaker under renewable energy purchase agreements","name":"AEP Ohio","official_url":"https://www.aepohio.com/"} — Solar Energy · confidence: medium
- Site acres: 1919 — Source · confidence: medium
- Construction scope: The exact asset is a 300 MW solar facility occupying up to 1,919 acres within a 3,400-acre project area near Mowrystown, Ohio. Construction included 744,549 photovoltaic panels, 84 inverters, 449 tracker motors with a 52-degree range of motion, five weather stations, 119,149 steel piles, 184,430 feet of AC trench cabling, 553,290 total feet of AC cabling, 255,948 feet of above-ground DC cabling, 49,100 feet of underground DC cabling, 50,810 feet of internal roads using 492,156 cubic yards of gravel, and a 345-kV substation. SOLV Energy is identified as the engineering, procurement, and construction company that built the project. — 18-1334-EL-BGN:Highland Solar Farm · confidence: medium
- Construction scope: The exact asset is a 300 MW solar facility occupying up to 1,919 acres within a 3,400-acre project area near Mowrystown, Ohio. Construction included 744,549 photovoltaic panels, 84 inverters, 449 tracker motors with a 52-degree range of motion, five weather stations, 119,149 steel piles, 184,430 feet of AC trench cabling, 553,290 total feet of AC cabling, 255,948 feet of above-ground DC cabling, 49,100 feet of underground DC cabling, 50,810 feet of internal roads using 492,156 cubic yards of gravel, and a 345-kV substation. SOLV Energy is identified as the engineering, procurement, and construction company that built the project. — Highland County Press: Developers recap Highland Solar construction, outline future plans at commission meeting - Nuthatch Solar · confidence: medium
- Significance: At 300 MW, the facility is a large Ohio solar asset; the Ohio Power Siting Board describes it as occupying up to 1,919 acres within a 3,400-acre project area approximately 3.2 miles northwest of Mowrystown. The plant directory ranks it #3 in Ohio and #142 in the United States by capacity. — 18-1334-EL-BGN:Highland Solar Farm · confidence: medium
- Description: Hecate Energy Highland LLC is a 300 MW solar-photovoltaic plant in Highland County, Ohio, with one generating unit identified as HIGHL and an EIA-listed first-unit online date of May 1, 2024. The Ohio Power Siting Board approved the Highland Solar Farm in 2019, and the project is located in portions of Clay and Whiteoak townships. DESRI identifies Highland Solar as a 300 MW Highland County asset and was identified as the project owner in 2025 local reporting, while Hecate Energy Highland LLC is identified as the plant operator. AEP Ohio selected Hecate to develop the project and secured 20-year renewable-energy purchase agreements for its output. — 18-1334-EL-BGN:Highland Solar Farm · confidence: medium
- Description: Hecate Energy Highland LLC is a 300 MW solar-photovoltaic plant in Highland County, Ohio, with one generating unit identified as HIGHL and an EIA-listed first-unit online date of May 1, 2024. The Ohio Power Siting Board approved the Highland Solar Farm in 2019, and the project is located in portions of Clay and Whiteoak townships. DESRI identifies Highland Solar as a 300 MW Highland County asset and was identified as the project owner in 2025 local reporting, while Hecate Energy Highland LLC is identified as the plant operator. AEP Ohio selected Hecate to develop the project and secured 20-year renewable-energy purchase agreements for its output. — Our Assets · confidence: medium
- Description: Hecate Energy Highland LLC is a 300 MW solar-photovoltaic plant in Highland County, Ohio, with one generating unit identified as HIGHL and an EIA-listed first-unit online date of May 1, 2024. The Ohio Power Siting Board approved the Highland Solar Farm in 2019, and the project is located in portions of Clay and Whiteoak townships. DESRI identifies Highland Solar as a 300 MW Highland County asset and was identified as the project owner in 2025 local reporting, while Hecate Energy Highland LLC is identified as the plant operator. AEP Ohio selected Hecate to develop the project and secured 20-year renewable-energy purchase agreements for its output. — Additions coming to Highland Solar - The Times Gazette · confidence: medium
- Financing summary: O’Melveny identifies financing work for the Highland Solar Project in Highland County, and DESRI’s corporate subsidiary list includes Highland Solar acquisition, development, project-holdings, and financing entities. The cited materials do not disclose the project-level loan amount, closing month, borrower, or lender group. Separately, on January 24, 2023, Hecate announced a $550 million corporate development credit facility consisting of a $250 million term loan and a $300 million letter-of-credit facility; reporting identified Investec, Nomura Securities, and National Bank of Canada as debt-financing leads, with Deutsche Bank and Generate Capital as coordinating lead arrangers. The facility refinanced an existing Hecate loan and supported Hecate’s broader multi-year solar-and-storage pipeline, so it should not be treated as sale consideration or confirmed project-level financing for Highland. — Maria von Schack - Partner | O'Melveny · confidence: medium
- Financing summary: O’Melveny identifies financing work for the Highland Solar Project in Highland County, and DESRI’s corporate subsidiary list includes Highland Solar acquisition, development, project-holdings, and financing entities. The cited materials do not disclose the project-level loan amount, closing month, borrower, or lender group. Separately, on January 24, 2023, Hecate announced a $550 million corporate development credit facility consisting of a $250 million term loan and a $300 million letter-of-credit facility; reporting identified Investec, Nomura Securities, and National Bank of Canada as debt-financing leads, with Deutsche Bank and Generate Capital as coordinating lead arrangers. The facility refinanced an existing Hecate loan and supported Hecate’s broader multi-year solar-and-storage pipeline, so it should not be treated as sale consideration or confirmed project-level financing for Highland. — Hecate Energy Secures a $550 Million Credit Facility... · confidence: medium
- Financing summary: O’Melveny identifies financing work for the Highland Solar Project in Highland County, and DESRI’s corporate subsidiary list includes Highland Solar acquisition, development, project-holdings, and financing entities. The cited materials do not disclose the project-level loan amount, closing month, borrower, or lender group. Separately, on January 24, 2023, Hecate announced a $550 million corporate development credit facility consisting of a $250 million term loan and a $300 million letter-of-credit facility; reporting identified Investec, Nomura Securities, and National Bank of Canada as debt-financing leads, with Deutsche Bank and Generate Capital as coordinating lead arrangers. The facility refinanced an existing Hecate loan and supported Hecate’s broader multi-year solar-and-storage pipeline, so it should not be treated as sale consideration or confirmed project-level financing for Highland. — Hecate Energy arranges landmark $550 million debt facility – pv magazine USA · confidence: medium
- Commercial parties.0: {"relationship":"Project owner and developer","name":"D.E. Shaw Renewable Investments (DESRI)","detail":"DESRI’s official asset materials identify Highland Solar as a 300 MW Highland County, Ohio project, and 2025 local reporting identifies DESRI as Highland Solar’s project owner.","official_url":"https://desri.com/"} — Our Assets · confidence: medium
- Commercial parties.0: {"relationship":"Project owner and developer","name":"D.E. Shaw Renewable Investments (DESRI)","detail":"DESRI’s official asset materials identify Highland Solar as a 300 MW Highland County, Ohio project, and 2025 local reporting identifies DESRI as Highland Solar’s project owner.","official_url":"https://desri.com/"} — Additions coming to Highland Solar - The Times Gazette · confidence: medium
- Timeline.0: {"event":"Ohio Power Siting Board approval","date":"2019-05-16","detail":"The Ohio Power Siting Board approved construction of the Highland Solar Farm, a 300 MW solar-powered electric-generation facility."} — Ohio Power Siting Board Approves Highland Solar Farm... · confidence: high
- Timeline.2: {"event":"Hecate corporate financing","date":"2023-01-24","detail":"Hecate announced a $550 million development credit facility comprising a $250 million term loan and $300 million letter-of-credit facility. The disclosed facility was corporate and portfolio-oriented rather than identified as Highland-specific project financing."} — Hecate Energy Secures a $550 Million Credit Facility... · confidence: medium
- Timeline.2: {"event":"Hecate corporate financing","date":"2023-01-24","detail":"Hecate announced a $550 million development credit facility comprising a $250 million term loan and $300 million letter-of-credit facility. The disclosed facility was corporate and portfolio-oriented rather than identified as Highland-specific project financing."} — Hecate Energy arranges landmark $550 million debt facility – pv magazine USA · confidence: medium
- Timeline.4: {"event":"Reported commercial operation","date":"2024-10-24","detail":"A later local report states that the 300 MW Highland Solar project began commercial operation on October 24, 2024."} — Highland County Press: Developers recap... · confidence: medium
- Timeline.5: {"event":"Planned battery-storage addition","date":"2025-11-12","detail":"DESRI described a proposed 300 MW/1,200 MWh battery-storage addition as being in the very early stages of development, with construction targeted no later than the third quarter of 2027 and online service targeted for late 2028."} — Additions coming to Highland Solar - The Times Gazette · confidence: medium
- Timeline.6: {"event":"Planned solar addition","date":"2025-11-12","detail":"DESRI described a separate planned 230 MW addition, titled Nuthatch Solar, on land adjacent to the operating Highland Solar Project, with construction and commercial operation targets in 2027 and 2028. It was not operating capacity of the original 300 MW plant."} — Additions coming to Highland Solar - The Times Gazette · confidence: medium
- Timeline.7: {"event":"Project acquisition or sale status","date":null,"detail":"No project-company acquisition or sale between Hecate and DESRI, including a definitive buyer, seller, consideration, or closing month, is established in the cited records. DESRI’s ownership is documented, but the available materials do not establish when or through what transaction DESRI became project owner."} — Additions coming to Highland Solar - The Times Gazette · confidence: medium
- Quality notes.1: The May 2021 Hecate transfer to Algonquin concerned a separate 100 MW Highland/New Market project and is excluded from this 300 MW EIA plant. — Highland County Press: Developers recap... · confidence: high
- Quality notes.2: EIA lists the first unit online on May 1, 2024, while a later local report states that the 300 MW project began commercial operation on October 24, 2024; both dates are retained with their respective source context. — Additions coming to Highland Solar - The Times Gazette · confidence: high
- Quality notes.3: The battery-storage and additional-solar proposals described in November 2025 were early-stage future additions, not operating capacity included in the 300 MW plant. — Hecate Energy - News · confidence: medium
- Quality notes.3: The battery-storage and additional-solar proposals described in November 2025 were early-stage future additions, not operating capacity included in the 300 MW plant. — Hecate Energy arranges landmark $550 million debt facility – pv magazine USA · confidence: medium
- Quality notes.3: The battery-storage and additional-solar proposals described in November 2025 were early-stage future additions, not operating capacity included in the 300 MW plant. — Maria von Schack - Partner | O'Melveny · confidence: medium
- Quality notes.4: A project-level sale price, project-acquisition closing date, and detailed project-financing amount were not identified. Hecate’s disclosed $550 million facility was a corporate development credit facility for its broader renewables pipeline, not identified as sale consideration or a plant-specific financing amount. — Maria von Schack - Partner | O'Melveny · confidence: medium
- Later sale or transfer: On 2025-07-29, Hecate Holdings acquired Repsol's 40% interest in Hecate Energy, ending their joint venture. The source describes a corporate-parent transfer and does not identify a sale or transfer of the 300-MW Highland Solar Farm itself. — Hecate Holdings Acquires Full Ownership of Hecate Energy · confidence: medium
- Later sale or transfer: On 2025-07-29, Hecate Holdings acquired Repsol's 40% interest in Hecate Energy, ending their joint venture. The source describes a corporate-parent transfer and does not identify a sale or transfer of the 300-MW Highland Solar Farm itself. — Repsol 2025 second quarter results: €603 million · confidence: medium
- Grid role: Utility-scale solar photovoltaic generation — 18-1334-EL-BGN:Highland Solar Farm · confidence: high

## Timeline

- 2025-11-12 — Planned battery-storage addition
  DESRI described a proposed 300 MW/1,200 MWh battery-storage addition as being in the very early stages of development, with construction targeted no later than the third quarter of 2027 and online service targeted for late 2028.
  Source: Additions coming to Highland Solar - The Times Gazette (https://www.timesgazette.com/2025/11/12/additions-coming-to-highland-solar/)
- 2025-11-12 — Planned solar addition
  DESRI described a separate planned 230 MW addition, titled Nuthatch Solar, on land adjacent to the operating Highland Solar Project, with construction and commercial operation targets in 2027 and 2028. It was not operating capacity of the original 300 MW plant.
  Source: Additions coming to Highland Solar - The Times Gazette (https://www.timesgazette.com/2025/11/12/additions-coming-to-highland-solar/)

## Sources

- [Hecate Energy - Projects](https://www.hecateenergy.com/projects/) — hecateenergy.com · tier other
- [Federal Register :: Hecate Energy Highland LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2021/10/22/2021-23111/hecate-energy-highland-llc-supplemental-notice-that-initial-market-based-rate-filing-includes) — federalregister.gov · tier regulatory
- [18-1334-EL-BGN:Highland Solar Farm](https://opsb.ohio.gov/cases/18-1334-el-bgn) — opsb.ohio.gov · tier regulatory
- [Hecate Energy - About Us](https://www.hecateenergy.com/about-us/) — hecateenergy.com · tier other
- [Solar Energy](https://www.aepohio.com/clean-energy/renewable/solar/) — aepohio.com · tier other
- [Highland County Press: Developers recap ...](https://nuthatchsolar.com/highland-county-press-developers-recap-highland-solar-construction-outline-future-plans-at-commission-meeting/) — nuthatchsolar.com · tier other
- [SOLV Energy | Highland](https://www.solvenergy.com/projects/highland) — solvenergy.com · tier other
- [Our Assets](https://desri.com/our-assets/) — desri.com · tier other
- [Additions coming to Highland Solar - The Times Gazette](https://www.timesgazette.com/2025/11/12/additions-coming-to-highland-solar/) — timesgazette.com · tier other
- [Hecate Energy - News](https://www.hecateenergy.com/news/2023/01/hecate-energy-secures-a-550-million-credit-facility-package--including-five-year-term-loan-and-lc-facility-) — hecateenergy.com · tier other
- [Hecate Energy arranges landmark $550 million debt facility – pv magazine USA](https://pv-magazine-usa.com/2023/01/24/hecate-energy-arranges-landmark-550-million-debt-facility/) — pv-magazine-usa.com · tier other
- [Maria von Schack - Partner | O'Melveny](https://www.omm.com/professionals/maria-von-schack/) — omm.com · tier other
- [Ohio Power Siting Board Approves Highland Solar Farm ...](https://www.actohio.org/highland-solar-farm-construction-approved-by-ohio-power-siting-board/) — actohio.org · tier other
- [Hecate Holdings Acquires Full Ownership of Hecate Energy](https://www.prnewswire.com/news-releases/hecate-holdings-acquires-full-ownership-of-hecate-energy-302516356.html) — prnewswire.com · tier other
- [Repsol 2025 second quarter results: €603 million](https://www.repsol.com/en/press-room/press-releases/2025/repsol-posts-net-income-of-603-million-and-announces-new-share-buyback/index.cshtml) — repsol.com · tier other
- [Hecate Energy - Highland Solar Farm](https://search-prod.lis.state.oh.us/api/v2/general_assembly_133/committees/cmte_h_sub_energy_generation_1/meetings/cmte_h_sub_energy_generation_1_2019-04-24-1000_460/testimony/1545/testimony_davidwilhelmanthonylogan_hecateenergy_ip.pdf) — search-prod.lis.state.oh.us · tier other

## Data quality

- it is not established as sale consideration for the generating plant. The May 2021 Hecate transfer to Algonquin concerned a separate 100 MW Highland/New Market project and is excluded from this 300 MW EIA plant. The battery-storage and additional-solar proposals described in November 2025 were early-stage future additions, not operating capacity included in the 300 MW plant. A project-level sale price, project-acquisition closing date, and detailed project-financing amount were not identified. Hecate’s disclosed $550 million facility was a corporate development credit facility for its broader renewables pipeline, not identified as sale consideration or a plant-specific financing amount.

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