CES

Sam Newell, Principal, The Brattle Group, wrote:

"We are very pleased with Dayzer. The model is set up to readily incorporate historical data, near-term forward data, and actual ISO data, which facilitates backcasting, calibration, and validation of the model. We have been able to achieve more accurate backcast simulations of actual market conditions than we have seen with other models. In addition, after being designed initially to perform short-term simulations, Dayzer is now set up to perform long-term simulations based on our assumptions on future market fundamentals. In our project experience with Dayzer, we have found the customer service to be outstanding. Assef Zobian, the founder, has deep and broad knowledge of ISO rules and operations, electricity economics, and the details of the physical transmission system in many regions of the U.S. His staff has also been very responsive on the many occasions when we have requested assistance with data, improvements to algorithms, and the development of special features for processing model inputs and outputs. -- The Brattle Group"

The Brattle Group

Theo Lawrence, Senior Power Market Analyst, Conectiv Energy, wrote:

"We are pleased with Dayzer. Dayzer support is very responsive to our needs. Additionally, since most Dayzer historical and forecast inputs are automaticallly input, the user can spend more time in analysis rather than data input. The difficulty is that there are a lot of uncertainties as to load and generation distribution as well as fuel costs. This can cause limits to be missed which can have an adverse impact on LMP results when backcasting for benchmarking purposes. However, I find that when I adjust the line ratings to force actual constraints to limit transfers in the model, the LMPs begin to respond like the actual LMPs responded to the system transmission constraints."

Hoff Stauffer, Managing Director, Wingaersheek Research Group, wrote:

"DAYZER is the right model to use for economic analyses of many electricity generation and transmission issues, both long-term and short-term. It models the transmission system explicitly, the way electricity really flows in proportion to the impedance on each transmission line, rather than assuming incorrectly that electricity flows as if it were in a pipe between geographic regions. DAYZER represents each transmission line and the constraints thereon, plus each generator and load bus. Further, it operates on an hourly basis, enabling it to capture flows over transmission lines and constraints by hour given the generation of all generating units by hour. Many of the other models do not capture transmission flows correctly, and others do not capture the hourly dynamics. DAYZER does both.
Moreover, DAYZER does what it designed to do reliably, without random mishaps, in contrast to some models designed to do the same thing. The user interfaces are helpful, without being mysterious or burdensome. The customer support from the DAYZER staff is outstanding.
Altogether, DAYZER is a very powerful analytic tool that can be used efficiently and cost-effectively to assess rigorously a variety of complex issues in the electricity markets."

Wingaersheek Research Group
8 Hovey Street,
Gloucester, MA 01930
978-281-1674