Market Simulation Returns
On September 24, market participants and the ISO resumed simulation activities for the new MRTU markets. It’s called IMS-R3 which is short for “Integrated Market Simulation Release Three.”
“While there are areas that need attention, overall we’re very pleased with the system performance experienced during the first weeks of IMS-R3,” said Mark Rothleder, ISO Principal Market Developer. “SCs representing more than 86 percent of the generating capacity on the grid are participating and we’ve seen system availability of 96 percent during the hours the market simulation environment was supported.”
This phase of simulation is similar to previous testing phases, but with two important enhancements:
- First, we have added the Real-Time Market. That means that in addition to testing their ability to submit bids and retrieve market results, market participants are also receiving dispatch instructions for generating units.
- Second, starting October 1st participants began receiving full settlement statements – with charges from both the Day-Ahead and the Real-Time Markets – that they can validate with information available through public and private sources.
“This phase of simulation is a key milestone because it integrates the forward and real-time market activities,” said Rothleder. “There are a few functions yet to be added, but the primary MRTU design features are available for testing.”
The addition of settlement statements is a critical feature that allows scheduling coordinators to validate the flow of dollars associated with their market bids. The complete settlement system includes more than 121 individual charge codes to track the finances associated with specific market activities. For the both the Day-Ahead and Real-Time Markets, charge codes are available for the following market products: energy, congestion, transmission losses, spinning and non-spinning reserves, regulation up, regulation down, inter-SC trades and the Grid Management Charge for inter-SC trades.
The ISO continues to test additional charge codes and will add them to IMS as they become available. In addition, the ISO held a training session in late September to walk through the process for validating settlement statements and to point participants to the sources for information they need to validate their statements.
There have also been a few challenges associated with IMS-R3. The ISO was able to resolve a couple of urgent issues that affected users’ access to the system fairly quickly, but some high-priority matters concerning system performance, the quality of market data and the availability of market results still need to be addressed.
“These issues demonstrate the need for robust market testing,” said Rothleder. “If we can address them in a simulated environment where real megawatts and dollars are not at risk, the transition to the new market will be much smoother and participants can learn to use their tools effectively to advance their own business objectives.”
Market simulation activities will continue though the end of this year and into mid-February of 2008. These exercises include both structured and semi-structured bidding based on specific scenarios outlined by the ISO and market participants.
- Structured testing allows for more consistency over the test results and facilitates the shake-out process to help detect bugs or variances in the new functionality for that simulation.
- Semi-structured testing allows market participants to vary their bid structures and strategies based on the defined scenario for the day (i.e. summer peak, fall, high hydro, low hydro, etc.). This allows participants to get a true feel for how the entire market will work, while at the same time testing their respective systems.
Additional market functionality will be added to the market simulation environment in early November with a final bundle to be added in mid-December. For each update, the schedule calls for periods of both structured and semi-structured testing to ensure the new functionality performs properly and that market participants may test the impact on their respective systems. Additional information about IMS-R3 is available on the ISO web site at: http://www.caiso.com/1bd7/1bd7ebbc72fc0.html |