Summary

Capstone Green Energy Holdings (NASDAQ: CGEH), headquartered in Van Nuys, California, is the primary U.S. manufacturer of micro-turbines — small, air-bearing natural gas generators in the 65 kW to 1 MW range. The company’s core products use patented foil air bearings (no lubricating oil required), a single moving part, and a compact form factor that makes them attractive for Combined Heat and Power (CHP) applications in commercial buildings, hospitals, industrial facilities — and colocation data centers.

Capstone is not a primary candidate for large-scale hyperscaler BTM deployments (where 100–1,000 MW is needed); its strength is in distributed, smaller-scale CHP applications where the recoverable heat improves site PUE and the modularity enables phased scaling. The company is increasingly targeting AI data center power with a new 800 VDC microturbine product developed with Microgrids 4 AI, Inc.

Key appeal: No oil (zero lube-oil maintenance), low emissions compared to reciprocating engines, fuel flexibility (natural gas, propane, biogas, RNG, hydrogen blends), compact form factor, CHP capability.

Risks: Not cost-competitive with GE Vernova or Wärtsilä for large-scale BTM; ITC phaseout (post-Dec 2024) removes key incentive for gas/biogas CHP; financial fragility (sub-$30M quarterly revenue; needs continued equity raises); market positioning squeezed between large gas turbines (above) and battery storage (below).

Key Facts

  • Company name: Capstone Green Energy Holdings, Inc.
  • Ticker: CGEH (NASDAQ)
  • HQ: Van Nuys, California, USA
  • Founded: 1988 (as Capstone Turbine Corporation; rebranded Capstone Green Energy Holdings)
  • CEO: Darren Jamison (as of 2026; long-tenured; prior energy industry executive roles)
  • Technology: Micro-turbines; air-bearing design with single moving part; combustion turbine cycle adapted for small-scale distributed generation
  • Product range:
    • C65: 65 kW per unit; smallest offering; CHP-capable (up to 150 kW thermal output)
    • C200S: 200 kW per unit
    • C600S: 600 kW per unit
    • C800S: 800 kW per unit
    • C1000S: 1 MW per unit; largest; clusters to 10+ MW
    • New: 800 VDC Microturbine (2025 launch with Microgrids 4 AI)
  • Fuel flexibility: Natural gas, propane (LPG), associated gas, flare gas, landfill gas, Renewable Natural Gas (RNG), hydrogen blends (up to 30% H2 by volume in testing)
  • Key differentiator: Air bearings (no lubricating oil; reduces maintenance, increases reliability, enables low-angle deployment)
  • Thermal output (CHP mode): High-quality heat recovery (300–600°C exhaust) enables steam, hot water, or absorption chilling
  • Competitive footprint: Primarily small commercial/industrial CHP; niche data center CHP for colos (5–50 MW range)
  • Recent acquisition: Cal Microturbine (acquired August 2025) — adds regional service capacity
  • Financials (FY ending March 2025):
    • TTM Revenue: ~$103M
    • Q1 FY2026 (ended June 2025): Revenue $28.4M (+25% YoY); Gross Margin 32%
    • Q2 FY2026 (ended Sept 2025): Revenue $26.8M (+33% YoY); Gross Margin 39%
    • Net income: marginally positive (Q1 FY2026: $0.8M net income — first profitable quarter in years)
    • Adjusted EBITDA: $4.5M (Q1 FY2026)

Technology: Micro-Turbines for Data Centers

How Micro-Turbines Work

A micro-turbine is a miniaturized version of a gas turbine: fuel combusts, hot gases spin a turbine connected to a generator, producing electricity. Capstone’s key innovation is the foil air bearing — the turbine shaft floats on a film of compressed air rather than oil-lubricated bearings. This eliminates:

  • Lubricating oil (no oil changes, no oil leaks, no fire risk from oil)
  • Gear reduction box (air bearings operate at extremely high RPM, with power electronics converting to grid frequency)
  • Most scheduled maintenance (single moving part, theoretically 8,000+ hours between major overhauls)

Data Center CHP Applications

In CHP mode, a Capstone micro-turbine captures the exhaust heat (300–600°C) for:

  1. Space heating / hot water: Reduces HVAC load in colder climates
  2. Absorption cooling: Converts heat to chilled water via absorption chiller (improves PUE in warm climates)
  3. Process steam: Low-grade process heat for industrial co-located facilities

For a colocation data center (moderate size, 1–50 MW), Capstone’s CHP configuration can reduce effective PUE from ~1.5 to ~1.2 by using heat that would otherwise be wasted. This is most economical in mild climates (Pacific Northwest, Northeast) where:

  • Cooling loads are lower
  • Natural gas is relatively cheap
  • The incremental cost of heat recovery infrastructure is offset by reduced cooling OPEX

For large-scale hyperscaler BTM (100+ MW): Capstone is not the right tool. GE Vernova LM2500XPRESS (35 MW per unit, 5-minute fast-start), Wärtsilä 50SG (18 MW per unit, modular), or Siemens SGT-800 (62 MW per unit) offer far more MW per installed unit. Capstone’s niche is in the 1–50 MW range where the CHP value proposition is strongest.

New 800 VDC Microturbine (2025)

In 2025, Capstone launched an 800 VDC DC-output microturbine in partnership with Microgrids 4 AI, Inc. Key features:

  • 800 VDC output: Directly powers GPU server racks (which are increasingly using 800 VDC bus) without AC-to-DC conversion stage — improves efficiency by eliminating rectification losses
  • Modular AI Power Blocks: Capstone microturbine + Microgrids 4 AI modular kit enables scalable deployments from edge (65 kW) to “giga-campus” (aggregated MW-scale)
  • Copper mass reduction: 800 VDC bus reduces distribution copper requirements by up to 45% vs. 208/480 VAC

This product targets AI data center edge deployments and small-footprint locations where gas turbines are oversized. It is not a competitor to GE Vernova at hyperscale; it is a complementary product for smaller, distributed AI inference workloads.

Data Center Deployment History

Capstone has installed microturbines in data centers and colocation facilities for CHP applications since the early 2010s. Notable deployments are generally not publicized by name but include:

  • East Coast and California colocation facilities using natural gas CHP for heating and absorption cooling
  • Telecom carrier hotels (high-density, mission-critical) using micro-turbines as backup/primary generation with CHP
  • Edge data centers in remote locations using propane or flare gas (oil field edge compute)

No hyperscaler-scale BTM deployments are publicly confirmed. Capstone’s data center revenue comes primarily from colocation and enterprise deployments, not hyperscalers.

Financial History & Current Status

Capstone has had a turbulent financial history. The company was previously named Capstone Turbine Corporation (CPST) and faced multiple near-bankruptcy events. Key turning points:

  • 2020–2021: Near-default on debt; required restructuring and equity raises
  • 2022: Company rebranded as Capstone Green Energy Holdings; new management emphasis on service revenue model (rental, maintenance)
  • 2023–2024: Returned to modest EBITDA-positive quarters; service revenue stabilized
  • FY2025 (ended March 2025): TTM Revenue ~$103M; first multi-quarter net income positive period since 2019
  • November 2025: $15M private placement at $2.00/share (premium to market); proceeds used for debt repayment (~$8M) and AI data center product development
  • August 2025: Acquired Cal Microturbine (regional California distributor); added service revenue

⚑ Financial risk: Capstone is not a financially robust company. With ~$103M TTM revenue and thin EBITDA, the company cannot sustain a major product launch or significant capex without continued equity raises. The November 2025 PIPE at $2.00/share (vs. a 2020 peak of $6+) reflects ongoing dilution risk for shareholders. The ITC phaseout for gas/biogas CHP (post-December 2024) removes a key incentive for new deployments.

Regulatory: ITC Phaseout Impact

Prior to 2025, CHP systems qualified for the federal Investment Tax Credit (ITC), which could offset 30% of project cost. The Inflation Reduction Act’s revisions removed the ITC for CHP systems fueled by natural gas or biogas for projects that did not meet “safe harbor” (5% spend incurred by December 31, 2024). This effectively eliminated the ITC for new natural gas CHP projects.

Impact on Capstone: Significant headwind for domestic CHP growth. Customers considering natural gas CHP projects face 30% higher effective project cost without the ITC. This may push customers toward:

  1. All-electric data center designs (no CHP)
  2. Fuel cell BTM (which has different ITC treatment)
  3. Hydrogen-fueled micro-turbines (which may qualify under clean-fuel production credits)

Capstone is responding by emphasizing RNG (Renewable Natural Gas) configurations, which may qualify under different clean energy incentives, and by targeting international markets where ITC is not relevant.

Key People

Darren Jamison — President & CEO

  • Long-tenured Capstone executive (joined 2006; CEO since 2008)
  • Background in utility and power generation finance
  • Oversaw multiple near-bankruptcy cycles and restructurings
  • Driving current pivot to AI data center power market

Jayme Brooks — CFO

  • CFO since 2014; manages equity raises and debt restructuring
  • Key architect of November 2025 PIPE and prior restructurings

People — Last Reviewed: 2026-04-25

Competitive Position

Capstone occupies a specific niche in the BTM data center power market:

  • vs. GE Vernova / Siemens (aeroderivative turbines): Much smaller per unit, CHP-capable, but not suitable for 100+ MW deployments. Capstone wins on CHP value and zero-lube-oil reliability for smaller sites.
  • vs. Wärtsilä (reciprocating engines): Wärtsilä 50SG is larger (up to 18 MW per unit) but uses oil lubrication. Capstone wins on low-maintenance, zero-oil applications.
  • vs. Bloom Energy (fuel cells): Both serve 1–50 MW distributed power. Bloom wins on efficiency (60% vs. ~30% for micro-turbines) and urban air quality optics. Capstone wins on capital cost.
  • vs. Battery + Solar: For 24/7 baseload power with CHP, gas micro-turbines are more reliable and lower total-cost than battery storage in most climates.

Watch List

  • 800 VDC microturbine commercialization: If Microgrids 4 AI partnership generates meaningful orders, Capstone could capture edge AI deployment market (2026–2027)
  • RNG configurations: If RNG fuel availability increases, Capstone could qualify for clean energy incentives and position as a “carbon-neutral” CHP provider
  • Financial solvency: Monitor quarterly earnings for continued EBITDA-positive performance; a return to losses would raise going-concern risk
  • ITC clean-tech pathway: Congressional action on CHP incentives could restore Capstone’s domestic market growth
  • BTM overview: /research/datacenters/behind-meter-power/
  • Larger gas turbines for data center BTM: /research/datacenters/behind-meter-power/ge-vernova-aeroderivative/
  • Reciprocating engines (Wärtsilä): /research/datacenters/behind-meter-power/wartsila-btm/
  • Fuel cell alternative: /research/datacenters/behind-meter-power/bloom-energy-sofc/