Updated:
COMMONWEALTH ENERGY SYSTEM
COMMONWEALTH ENERGY SYSTEM is identified in the retained SEC EDGAR snapshot dated 2026-10-14. Its SEC Central Index Key is 0000071304, and its reported...
Overview
COMMONWEALTH ENERGY SYSTEM is identified in the retained SEC EDGAR snapshot dated 2026-10-14. Its SEC Central Index Key is 0000071304, and its reported industry is Electric & Other Services Combined. The retained history contains 12 filings, including 10-Q filed on 1999-08-16. Each filing retains its accession, filing date and original SEC document link. This historical evidence does not establish current registration, listing, ownership or financial condition.
Company overview
- Legal name
- COMMONWEALTH ENERGY SYSTEM
- Classification
- Company
- Industry (SIC)
- 4931 — Electric & Other Services Combined
- Headquarters
- Cambridge, MA, United States
- Incorporated in
- MA
- Fiscal year end
- December 31
- SEC CIK
- 0000071304
Recent SEC filings
| Form | Filed | Period | Filing |
|---|---|---|---|
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q 6/30/1999 | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q 3/31/1999 | ||
| 8-K | Form 8-K | ||
| 8-K | BEC ENERGY AND COMMONWEALTH ENERGY SYSTEM MERGER | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q | ||
| 8-K | COMMONWEALTH ENERGY SYSTEM SUB. PURCHASE OF MATEP | ||
| 8-K | COMMONWEALTH ENERGY SYSTEM - SALE OF GENERATION ASSETS | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q | ||
| DEF 14A | DEFINITIVE PROXY - COMMONWEALTH ENERGY SYSTEM | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM FORM 10-Q | ||
| 10-Q | COMMONWEALTH ENERGY SYSTEM - FORM 10-Q |
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