Mark Guzman
Mark Guzman was a real-time scheduler and trader at Enron’s West Power Trading Division in Portland, Oregon, responsible for monitoring and executing power schedules for the California Independent System Operator and Pacific Northwest markets during the 2000-2001 energy crisis. Working rotating day and night shifts as part of the desk’s 24-hour operations, Guzman handled hour-ahead scheduling adjustments, transmission constraints, and position management for deliveries at key western interconnection points including Mead 230, Colstrip, and the Mid-Columbia trading hub.
His email archive contains 6,194 messages spanning April 2000 to May 2001, with the majority consisting of automated scheduling system alerts that document the intensive real-time coordination required to manage California’s strained power grid. Unlike senior traders who faced criminal prosecution for market manipulation schemes, Guzman’s correspondence reveals the operational mechanics of real-time scheduling rather than strategic trading decisions.
Career at Enron
Joining the Real-Time Desk
Guzman transitioned to John M. Forney’s real-time trading desk in October 2000 after submitting a formal application for the position. In his application email to Forney, Guzman expressed confidence that his prior experience with Enron’s systems would make him a valuable addition: “With my prior and current work experience and knowledge of the enpower system, I am confident that I will be a valuable asset to your team.”
The transition placed Guzman in one of the most operationally demanding roles in Portland’s trading organization. The real-time desk operated continuously, requiring traders to rotate between day and night shifts to maintain coverage of western power markets. As Guzman explained to a friend inquiring about his schedule: “I switch back and forth from night to day shifts it depends on the week.” The friend had remarked that Guzman was “working the night shift and sleeping during the day like a vampire,” capturing the unconventional lifestyle required by real-time trading operations.
Upon joining the desk, Guzman was assigned turret extension 3741 on the Portland trading floor, connecting him to the phone systems that enabled real-time coordination with counterparties, scheduling coordinators, and the California ISO.
Organizational Structure
Guzman worked within Tim Belden’s West Power Trading Division, specifically under the management of John M. Forney who led the real-time desk operations. The Portland office organized its trading activities across specialized desks, with Jeffrey Richter managing the Short-Term California desk and Forney’s team handling immediate power flows and grid operations.
His colleagues on the real-time desk included Bill Williams III, whose recorded telephone call ordering a Las Vegas power plant shutdown during a federal emergency later became key evidence of Enron’s manipulation schemes. Other team members included Monika Causholli, who handled real-time trading, and Cara Semperger, who coordinated scheduling and transmission operations. The desk experienced staffing changes during Guzman’s tenure, with Stanley Cocke departing for Middle Marketing in October 2000 and Tobin Carlson joining from Enron Broadband in November 2000.
Operational Responsibilities
California ISO Scheduling
A significant portion of Guzman’s daily work involved processing California ISO schedules and managing variance detection. The California ISO operated day-ahead and hour-ahead markets requiring constant monitoring and schedule adjustments. Guzman’s responsibilities included submitting and verifying final schedules for California utilities including PG&E (PGE1) and Southern California Edison (SCE1), managing load schedules and ancillary services, and coordinating real-time adjustments as market conditions changed.
His email archive reveals the systematic nature of this work through thousands of automated alerts from the CODESITE scheduling system. These alerts tracked hour-ahead variances, schedule confirmations, and transmission changes, requiring immediate attention during market hours.
Pacific Northwest Operations
Beyond California markets, Guzman managed scheduling for Pacific Northwest power flows. This included coordinating with the Bonneville Power Administration for transmission across the federal power system, managing Mid-Columbia schedules at the major Pacific Northwest trading hub, handling transmission cuts and curtailments across the Western interconnection, and coordinating with scheduling counterparties in Seattle and across the region.
Key delivery points in Guzman’s scheduling responsibilities included Mead 230 at the Nevada-Arizona border, Colstrip generation facilities in Montana, John Day on the Oregon-Washington border, and the California-Oregon Border and Nevada-Oregon Border interties.
Position Management
A critical aspect of real-time trading required traders to maintain “flat” positions in Enron’s trading system at shift changes. The position manager in Enpower tracked all scheduled power flows, and any mismatches could result in financial exposure or operational problems for the incoming shift. Guzman’s correspondence reflects the discipline required for clean handoffs, with explicit attention to ensuring positions were properly closed before transitioning coverage to colleagues.
Technical Environment
Trading Systems
Guzman worked extensively with Enpower, Enron’s primary trading and position management system. The platform tracked real-time positions across all scheduled power flows and required constant monitoring during trading hours. Additional tools included CAPS, the California Power System scheduling interface for ISO submissions, shared scheduling databases maintained on the Portland office’s P: drive, and Lotus Notes for email and coordination.
Markets and Interconnections
The Western interconnection’s complex market structure required Guzman to work across multiple regulatory frameworks simultaneously. The California ISO administered the state’s restructured electricity markets, with distinct procedures for day-ahead, hour-ahead, and real-time scheduling. The Bonneville Power Administration controlled federal transmission across the Pacific Northwest, while the Western Systems Coordinating Council provided regional coordination for reliability and scheduling standards.
California Energy Crisis Context
Guzman’s tenure on the real-time desk coincided with the most acute phase of California’s energy crisis. From late 2000 through early 2001, California experienced severe electricity shortages, wholesale price spikes, and eventually rolling blackouts. The real-time desk sat at the operational center of this crisis, managing power flows into a market experiencing unprecedented stress.
The volume of ISO Super-Peak trading during the 5am-8am blocks, frequent transmission curtailments, and constant variance management visible in Guzman’s email archive reflect the intensity of this period. Hour-ahead and day-of scheduling activity reached levels that strained both human operators and automated systems.
While Guzman’s correspondence documents the operational mechanics of real-time scheduling during the crisis, his archive does not contain evidence connecting him to the manipulation strategies designed by senior traders. Unlike John M. Forney, who created the “Death Star” scheme, or Bill Williams III, whose recorded phone call ordered a plant shutdown during a federal emergency, Guzman’s preserved communications reflect scheduling operations rather than strategic manipulation decisions.
Key Correspondents
Guzman’s correspondence patterns reflect the automated, operationally intensive nature of real-time scheduling work.
| Name | Messages | Role |
|---|---|---|
| CODESITE (automated) | 2,145 | Automated scheduling system alerts |
| Bill Williams III | 306 | Real-time desk colleague |
| Cara Semperger | 136 | Scheduling coordinator |
| John M. Forney | 138 | Real-time desk manager |
| Carla Hoffman | 132 | Trading colleague |
The dominance of automated alerts — more than a third of all messages — underscores the operational intensity of the role. Among human correspondents, Bill Williams appears most frequently; the two shared responsibilities on rotating shifts. Signature terms from Guzman’s corpus include “trans” (transmission schedules), “final” (ISO final schedules), “hourahead” (hour-ahead scheduling), and “variances” (schedule variance detection), all terms tied to real-time scheduling mechanics.
Email Corpus Analysis
Guzman’s archive of 6,194 messages represents correspondence with 145 unique addresses over thirteen months. The archive also preserves personal correspondence revealing aspects of Guzman’s life outside Enron. Regular emails to a Dave Guzman at Fluor suggest family connections, while correspondence with friends including Ben Pacewic and Marcus Jones discusses social plans and sports. Promotional emails from Alaska Airlines and Southwest Airlines, along with correspondence with Oregon State Beavers athletics, document a Portland-area life outside the trading floor’s demanding schedule.
Significance
Guzman’s archive provides a ground-level view of Enron’s real-time trading operations during the California energy crisis, documenting the operational infrastructure that enabled both legitimate scheduling and market manipulation. While senior traders designed fraudulent schemes and eventually faced criminal prosecution, staff like Guzman executed the day-to-day scheduling operations that kept power flowing across the Western interconnection.
His correspondence illustrates the complexity of real-time power scheduling in deregulated markets, the intensive coordination required between market participants and grid operators, and the demanding work environment of 24-hour trading operations. The archive’s predominance of automated alerts and operational communications, rather than strategic discussions, reflects the distinction between desk-level execution and management-level decision-making in Enron’s trading organization.
See Also
- John M. Forney - Real-Time desk manager who pleaded guilty to wire fraud conspiracy
- Bill Williams III - Real-time desk colleague whose recorded call documented market manipulation
- Tim Belden - Head of West Power Trading Division
- California Energy Crisis - The 2000-2001 crisis during which Guzman worked on the real-time desk
References
This article is based on 6,194 emails in Mark Guzman’s archive in the Enron corpus, spanning April 2000 to May 2001, with correspondence involving 145 unique addresses. The archive consists primarily of automated CAISO scheduling alerts and real-time desk operational communications.