The MGRID Solid-State Transformer Coverage: A Comprehensive Index

The mgrid solid-state transformer (SST) coverage published over the May 2026 reporting cycle aggregates approximately 100 individual articles across the major SST manufacturers, deployments, federal programs, technical foundations, applications, and strategic dimensions. This index summarizes the structure of the coverage to allow readers to navigate the body of work.

Origins and Foundational

• The 1968 GE Patent That Founded SST Technology — William McMurray US 3,517,300

• From Electronic Transformer to Intelligent Universal Transformer — naming history (McMurray, Brooks, EPRI)

• FREEDM Systems Center at NCSU — NSF Gen-III ERC since 2008

• Why Iron-Core Has Outlasted 130 Years — historical retrospective

• Single-Stage vs Two-Stage SST Topology — engineering foundation

Manufacturers

• Eaton + Resilient Power Systems acquisition (August 2025, ~$86M)

• Amperesand $80M Series A (Walden Catalyst + Temasek, November 2025)

• DG Matrix first commercial multiport SST (February 2026)

• ABB strategic minority stake in DG Matrix (March 2025, $20M seed)

• Hitachi Energy $1.5B Vaasa + Bad Honnef + NA capacity (April 2025)

• Delta Electronics 800VDC SST at OCP Summit 2025

• SolarEdge + Infineon 2-5 MW SST (November 2025)

• Heron Power $140M Series B (Andreessen Horowitz + Breakthrough Energy, February 2026)

• Mitsubishi Electric SST positioning

• GE Vernova 2027 SST roadmap

• Schneider Electric SST positioning

• Enphase Energy IQ SST with GaN BDS

• TMEIC + Japan SST market $45M by 2030

• Sungrow AI data center SST entry

Deployments and Field Reference

• WattEV 12-15 kV SST for megawatt truck charging

• ABB E-mobility MCS1200 1.2 MW charger (April 2025)

• Eaton-NUS Singapore STDCT 2.5 MW SST

• NVIDIA 800V HVDC Supplier Alliance at COMPUTEX 2025

• ABB PETT on Swiss Federal Railways (2011 — first revenue rail SST)

• US Navy MVDC + SSTR shipboard programs

• China State Grid Wujiang + Hangzhou + Qinghai 110 kV demos

• KEPCO Seogeochado world’s largest DC island demonstration

• Tata Power-DDL India first PVT micro substation

Federal Programs and Funding

• ARPA-E Modular SST Program — Georgia Tech anchor

• Eaton DOE 2021 $4.9M agreement retrospective

• EPRI + 6 utilities SSP 25 kVA SST demo

• NSF FREEDM 17-year mark + Gen-IV ERC competition

• Federal R&D investment ecosystem retrospective

Technology, Supply Chain, and Engineering

• Medium-frequency transformer at SST heart

• DC-link capacitor reliability — hidden failure mode

• Wolfspeed 200mm SiC wafer capacity bottleneck

• Silicon Carbide vs Gallium Nitride for MV-SSTs

• Hitachi Energy 110-year Vaasa transformer heritage

• Cooling architectures for MV-SSTs

• DC-link capacitor supply chain (MPPF duopoly+)

• Vacuumschmelze VITROPERM + Hitachi Metals FINEMET

• SSTs vs HVDC VSC — different industries

• 1500 VDC vs 800 VDC standardization debate

• Solid-state circuit breakers — adjacent technology

• onsemi EliteSiC — third SiC supplier

Applications

• US Army forward-deployed microgrid SST

• Industrial DC processes — EAFs, chlor-alkali, hydrogen

• SST + BESS integration via multiport architecture

• Offshore wind direct-drive PMSG + SST

• Green hydrogen electrolyzer interconnect — largest underdeveloped market

• Bloom Energy fuel cell + SST integration

• V2G bidirectional charging

• Mining haul truck electrification

• DC microgrid for remote communities

Standards, Regulation, and Business Model

• SSTs solve IEEE 519 harmonic problem at MW EV chargers

• NEC Article 706 + 800 VDC code gap

• UL 1741, IEC 62109, CE marking certification path

• Insurance and warranty terms shaping adoption

• Catastrophic failure modes + fire safety

The mgrid SST coverage continues. Subsequent articles will cover individual commercial reference deployments as they are publicly announced, fresh quarterly funding rounds, and ongoing federal program developments through 2026 and 2027.

Related Coverage

• FREEDM Systems Center at NCSU: The 2008 NSF Center That Turned Solid-State Transformers Into Real Devices: FREEDM Center’s foundational role in solid-state transformer development
• The Federal R&D Investment Ecosystem Under the US Solid-State Transformer Industry: ARPA-E, DOE OE, NSF FREEDM, and Why It Matters: Federal R&D investment ecosystem for US solid-state transformer industry
• NSF FREEDM Center Hits 17-Year Mark As Generation-IV Engineering Research Center Competition Begins: NSF FREEDM Center’s 17-year mark and future competition
• Virginia Tech CPES Is the Second-Most-Important US Academic Solid-State Transformer Research Center After NCSU FREEDM: Virginia Tech CPES as a key academic SST research center