I've been getting calls from solar developers saying that Idaho Power has been rejecting interconnection applications for projects over 100kW, citing distribution system capacity constraints. This seems to be a recent change in policy - applications were being approved routinely just six months ago. The utility is telling developers they need expensive system upgrades that can cost $50,000-$200,000 per project. Has anyone else in Idaho territory seen this? I'm wondering if this is a legitimate technical issue or if the utility is trying to slow down solar development.
Idaho PUC denying solar interconnection applications - what's going on?
I'm also in Idaho and have heard similar complaints from clients in Boise. Idaho Power claims they're doing detailed power flow studies now that they weren't doing before. The irony is that some of these "constrained" circuits have had large industrial customers disconnect in the past year, so there should actually be more capacity available. I suspect this is related to their ongoing battle with rooftop solar and net metering. The PUC needs to investigate whether these capacity constraints are real or manufactured.
We've seen similar patterns here in California over the years. Utilities sometimes use interconnection studies as a way to control the pace of distributed generation development. The key is whether they're applying consistent technical standards or if the requirements seem to change project by project. Has anyone requested copies of the actual studies Idaho Power is using to justify the upgrade requirements? Those technical reports can be very revealing.
Xcel Energy here in Colorado went through something similar a few years ago before the PUC stepped in with new interconnection standards. The problem was that utilities were using worst-case scenarios and overly conservative assumptions in their studies. Real-world power flows are usually much more favorable than the theoretical models suggest. Idaho developers should definitely push back and demand detailed technical justifications for any required upgrades.
Good advice on requesting the studies. I've started doing that and the results are interesting. In one case, Idaho Power claimed a circuit couldn't handle a 200kW solar installation but their own load data showed peak demand on that circuit has dropped 15% over the past three years. The math doesn't add up. I think they're using outdated capacity assumptions and haven't updated their planning models to reflect current load patterns.
That's a smoking gun right there. Outdated capacity models are a common issue, especially as load patterns change with energy efficiency and industrial customer departures. Have you considered filing a formal complaint with the Idaho PUC? If you can document that the utility's capacity constraints aren't based on current data, that could force them to update their interconnection procedures. Other states have had success with this approach.
A formal complaint might be the way to go. I've been tracking Idaho Power's interconnection approvals and the pattern is pretty clear - anything under 25kW gets approved automatically, 25-100kW gets approved with standard conditions, but over 100kW almost always requires expensive upgrades now. That's not how technical capacity constraints work. It suggests they're using the interconnection process to discourage larger commercial solar projects.
Warren, that's exactly what I'm seeing too. The 100kW threshold is too convenient to be a coincidence. I'm working with a solar developer to prepare a PUC complaint. We've got documentation on five projects where Idaho Power's capacity claims don't match their own load data. The utility needs to be held accountable for using accurate, current information in their interconnection studies.
Make sure you include a request for the utility's interconnection queue data and study methodologies in your complaint. Transparency is key to fixing these issues. In California, once the PUC required utilities to publish their interconnection procedures and capacity maps online, a lot of the arbitrary denials stopped. Sunlight is the best disinfectant when it comes to utility gamesmanship.
Great point about transparency. Idaho Power's interconnection queue information is practically non-existent compared to other utilities. You have to make individual records requests to get basic information about pending applications and study timelines. That lack of transparency makes it easier for them to apply inconsistent standards without anyone noticing the patterns.
The interconnection queue transparency issue is huge. When utilities keep this information private, it's impossible to identify systematic problems or discriminatory treatment. I hope your PUC complaint forces Idaho Power to publish more detailed information about their interconnection processes and decisions. That would benefit everyone trying to develop distributed generation projects in their territory.
Thanks for all the support and advice everyone. We filed the formal complaint with the Idaho PUC yesterday. Included documentation on seven projects where Idaho Power's capacity constraints appear unjustified based on their own load data. Also requested that they be required to publish interconnection queue information and study methodologies online. Will keep everyone posted on how this develops. Hopefully we can get some accountability and transparency in the process.
Good luck with the complaint filing. Ohio had similar issues with FirstEnergy a few years back and a well-documented PUC complaint really did force changes in their interconnection procedures. The key was showing a pattern of inconsistent treatment rather than just complaining about individual projects. Sounds like you've got the documentation to make a strong case.
This is exactly the kind of regulatory advocacy our industry needs to be doing. Too often utilities get away with using outdated studies and inconsistent standards because no one challenges them on the technical details. Glenda, I'd be happy to review any technical aspects of Idaho Power's interconnection studies if that would be helpful. Sometimes having an independent engineering review strengthens these complaints significantly.