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DAYZER (See Brochure-V3.5-B101)

DAYZER (See Brochure-V4.0-B121)

DAYZER (See Brochure-V5.1-B125)
Day-Ahead Locational Market Clearing Prices Analyzer (DAYZER) (a model for each RTO). Cambridge Energy Solutions has developed DAYZER to assist electric power market participants in analyzing the locational market clearing prices and the associated transmission congestion costs in competitive electricity markets. This tool simulates the operation of the electricity markets, the dispatch procedures adopted and used by the corresponding independent system operators (ISOs), and replicates the calculations made by the ISOs in solving for the security-constrained, least-cost unit commitment and dispatch in the day-ahead markets. It forecasts the day-ahead hourly locational market-clearing prices and congestion costs, using the most recently available data on fuel prices, demand forecast, unit and transmission line outages, and emission permits costs. DAYZER incorporates all the security, reliability, economic and engineering constraints on generation units and transmission system components. It can be easily modified to emulate the specific operation of any regional market and the dispatch or operating procedures adopted and used by various ISOs. It is tailor-made for each regional market to capture the particularities of that market. DAYZER is currently available for the NYISO, NEPOOL, PJM RTO, MISO and ERCOT markets, and we are currently working on the WECC. DAYZER has the following features:

  1. Easy to use and user friendly
  2. Accurate security-constrained unit commitment and dispatch algorithms that mimics those used by the ISOs in the Day-ahead market
  3. Accurate data inputs and assumptions (up-to-date database on thousands of items). Uses NAPD for information on generation and transmission system elements (see database below)
  4. Accurate modeling of each market with its own particularities (second contingency constraints, locational reserve markets, etc..)
  5. Captures marginal transmission losses in dispatch and clearing prices in markets where implemented
  6. Graphical user interface plus Access database output, plus many reports that make the model very transparent
  7. Captures transmission outages, transmission contingencies, nomograms, planned and known transmission upgrades
  8. Models accurately phase angle regulators and loop flows
  9. Allows users to analyze various scenarios and quantify the impact of various key variables/assumptions
  10. Tested against actual market prices and the results are excellent (see DAYZER brochure)
  11. In addition to DAYZER as a core, DAYZER long-term uses the following modules:
    • Long–term load forecast (based on historical load shape and forecasted peak demand)
    • Fuel prices from NYMEX (Fuel Oil and Natural Gas)
    • Random Outage using Bernoulli probability model
    • Maintenance schedule (optimized based on reserves)
    • Imports/exports

Tranzer is used to edit Power Flow Data (PFD) stored in a backend database that represents an electric transmission system together with the additional data required for various analyses. This additional data includes specifications for generation units and aggregate buses (zones and hubs) as well as phase angle regulators (PARs), transmission lines (AC and DC), interfaces, and contingency constraints. Once the PFD has been defined, Tranzer can also be used to analyze the transmission system, in which case the application is capable of calculating DC shift factors (with or without losses), DC loss factors, and DC power flows. Transmission system data can be imported from PSS/E (V26, V27) data files or created from scratch. Generation units, aggregate buses, PAR constraints, line constraints, interface constraints, and contingency constraints can be imported (from CSV files) or created interactively within the application by selecting elements of the transmission system. The application provides table based reports for all transmission system data as well as the additional constraint data. A search facility is provided for navigating large data sets. Table reports can be copied to MS Excel spreadsheets using normal clipboard operations. The application is also capable of generating a graphical network diagram view of the neighborhood of the transmission system around a selected bus, and building a one-line diagram. These diagrams are fully interactive, allowing the user to navigate to transmission system data by selecting entities shown on the diagram. Finally, it has a direct interface with DAYZER that allow users to analyze the output of DAYZER simulations in more detail.

Online NAPD
North America Electric Power Transmission and Generation Database (NAPD) is a database for each NERC region. This database is continuously updated and available on line. Users have ability to query the database for specific information (with many predefined queries/reports). This database is available for licensing on an annual subscription basis for any region or pool.

  • LOAD: Historical and forecasted electricity load data for all service areas/zones of the United States and Canada, hourly shape.

  • OPERATING RESERVES: Historical and forecasted operating reserves (spinning, AGC and quick start) based on the specific requirements instituted by each ISO in the region.

  • FUEL: Historical and forecasted fuel prices for specific generating units based on energy price forecasts from major forecasting institutions (Natural Gas, Coal and Oil).

  • GENERATING UNITS: Physical, geographical, environmental, administrative, regulatory and economic data for all existing generating units in the U.S. and Canada as well as for all generating units under development and proposed for development (plus graphs on generation mix).
    • Thermal Unit Characteristics
      • Unit type (steam, combined-cycle, combustion turbine, cogeneration, etc.)
      • Heat rate values and curve
      • Summer and Winter Capacity
      • Variable Operation and Maintenance costs
      • Fixed Operation and Maintenance costs
      • Forced and planned outage rates
      • Minimum up and down times
      • Quick start and spinning reserves capabilities
      • Startup costs
      • Emission rates
      • Operating reserves contribution
    • Hydro Unit Characteristics
      • Unit type (baseload, intermediate, peaker)
      • Summer and Winter Capacity
      • Variable Operation and Maintenance costs
      • Operating reserves contribution
      • Monthly capacity factors
    • Pump Storage Unit Characteristics
      • Summer and Winter Capacity
      • Variable Operation and Maintenance costs
      • Efficiency
      • Other (wind, solar, refuse, etc..)

  • TRANSMISSION SYSTEMS: Physical, geographical, and economic data for all existing transmission lines in the U.S. and Canada; constraints, contingencies and significant interfaces within and across all regions of the Eastern Interconnect, Western Systems Coordinating Council (WSCC) and Electric Reliability Council Of Texas (ERCOT). Including transformers, lines, phase shifters and buses. Most data are provided in the form of a solved load flow case (PTI file).

  • TRANSMISSION LINE OUTAGES: A list of transmission line outages as scheduled by ISOs.

  • GENERATION UNIT OUTAGES: A limited set of generation unit outages is provided from public sources.

  • HISTORICAL PRICES: Day ahead and real-time hourly locational market clearing prices for the Northeast markets, and their congestion and loss components.

  • HISTORICAL FLOWS: Scheduled hourly imports and exports from neighboring markets (inter-regional power flows).

  • ENVIORNMENTAL COSTS: Emission Permit Prices (NOx and SOx, CO2, Hg)

  • PLANNED ADDITIONS: Proposed & planned additions and retirements of both generation and transmission system components by technology type, location, size, etc..

  • SUPPLY CURVE: Electricity supply curve based on estimated marginal cost of production, forecasted fuel prices and generation units adjusted availability.

  • CAPACITY BALANCE: Capacity balance report by market and submarket for markets with Locational Installed Capacity markets.

  • TRANSIMISSION RIGHTS: Reports on market clearing prices of transmission rights in the auctions administered by the ISOs, and in their value in the Day-Ahead Market.

BusMap operates on load flow cases stored in a proprietary database format structured by Tranzer. BusMap compares two or more load flow cases from the same region and maps the topology of one load flow case to the other in order to determine and obtain a one-to-one correspondence for the respective network elements included in each load flow case. In addition, it maps all transmission constraints, generation units and aggregate loads from one transmission database to another.

Optimal Scheduler is a tool that helps power plant owners optimize the operation and dispatch of their generation assets either for a single unit or portfolio of generation units. This tool optimizes maintenance schedule for thermal generation units, and optimal daily operation given units’ physical constraints. All of our software products are available for annual licensing; with an optional support and maintenance package.


Cambridge Energy Solutions provides training, maintenance and support of all its software products. These services can be provided either remotely or on site.

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