Matt Hartig -
You are correct on the MISO versus RTO - I spoke inaccurately - I get my terms backwards sometimes!!
Judgless - BrulTech appears to be pretty stagnant on their website - Google “power meter” and They are on July fourth break 2011. Found one item for sale Ebay UK for over $600? I have a Current Cost Envi out of UK and thy are a bit stagnant as well but still works on its original battery 5 years now but only cost me $120 with two magnets for the mains. It too allows a manual download CSV file but without pricing I can go to ComEd 45 days later and get that hourly data from them with usage and price. Its that real time data that is needed to be able to act timely!!
As far as day ahead prices - they are an indicator but when contingencies and constraints happen on the grid the prices go way high above the previous day predictions.
That is when my capacity charge is also at highest risk since these can easily and likely by definition move into the “Coincidental Peaks” (CP).
Here is the past situations where people have been hit with both high cost and high usage outside the predicted values by over 50 times!!: Its December 2 - post Thanksgiving, when the US puts outs Christmas decorations lights (no I am not an atheist). Predicted is 4 cents per kWH (Energy Supplyy cost only). All of sudden its dark on the East coast and something on the supply/transmission side goes wrong and now they are buying electricity from Exelon Nuclear Generation in Chicago to keep the festive lights on in Boston. Electricity now goes to 30 cents versus predicted 4. One hour later the midwest goes to night and their Xmas lights get turned on and now there is no electricity to be sent to the east coast and electricity goes to a $1.00 across the RTO. If my lights, AC, or Electric EV charging station is on during this period it would cost me the equivalent of $20 - $25 per gallon gasoline for my Leaf. If I get dinged for a “CP” event and I a using 8KW per hour, normally .3 kWh, this could take my monthly capacity charge from $1.60 per month to over $48 per month - annual cost of not watching = $46*12 = $552.
Add that on top of paying 50 cents per kWh for a chunk of time can really hurt. I guess the bottom line is Real time customers watch their electricity more than fixed rate customers and thus find the heavy loads and shift them to save money.
Access to real time data is a new concept that sends many people/survivalist into their “fraidy house” aka storm shelters, etc. Could not find my term on Google? That is what my Grandmother called them in Texas. I would be happy for now with the approved devices that let you see real time kWh consumption.
Best analogy to groceries is I want to know how much the trip to the grocerystore cost for 8 bags.
Still do not know how much each bag cost or how much each item cost in the bag. I am not even sure what I am having for Dinner??
Thanks for the insight and corrections - Rex
Have not gotten the Arduino to scrape PJM yet, Trying linux Ubuntu v12 workstation now?
Did get a first response from ComEd on SmartThings zigbee request - They are looking and will get back. Will advise.