Hope everyone had a good Thanksgiving. I'm dealing with a frustrating case involving Idaho Power and their Schedule 84 net metering interconnection fees. Client in Boise installed a 75kW solar system last year, and Idaho Power is now claiming they owe an additional $12,500 in "system impact study" fees that weren't disclosed during the initial interconnection process. The original estimate was $2,800 for interconnection, but now they're saying the actual costs were much higher. Anyone dealt with surprise interconnection fee increases after the fact?
Idaho Power Schedule 84 Interconnection Fee Dispute
Stan, this is becoming a common problem across multiple utilities. They provide low-ball interconnection estimates to encourage solar development, then hit customers with massive true-up bills after the system is installed. KCP&L tried something similar here in Kansas City - quoted $3,200 for interconnection, then billed $14,800 after commissioning. We fought it successfully by showing they violated their own tariff's cost estimation procedures.
Kevin, that's exactly what happened here. Idaho Power's initial feasibility study said "minimal system upgrades required" and estimated costs at $2,800. Now they're claiming they need to upgrade transformers and reconfigure protection schemes for $12,500 additional. The client feels like they were baited and switched. Did you have success getting KCP&L to stick to their original estimate?
Stan, yes we did. The key was proving their initial study was inadequate under their own interconnection procedures. The tariff requires a "good faith estimate" based on reasonable engineering analysis. If they missed obvious upgrade requirements, that's their problem, not the customer's. We also showed the customer relied on the initial estimate for project financing, so changing it after the fact caused economic harm.
This is exactly why I always recommend clients get multiple interconnection studies for larger systems. Consumers Energy here in Michigan has burned several of our clients with surprise upgrade costs. One client went from a $4,500 estimate to a $22,000 final bill because they "discovered" the need for a new substation relay during construction. The client ended up in litigation that took two years to resolve.
Tina, that's terrifying. Two years of litigation over interconnection costs could bankrupt a small commercial customer. I'm hoping to resolve this through Idaho Power's dispute process first. Their customer advocate seems receptive to reviewing the original study methodology. Kevin, did you file any regulatory complaints, or was it resolved directly with the utility?
Stan, we filed with the Kansas Corporation Commission after the utility wouldn't negotiate. The KCC ruled that utilities can't substantially increase interconnection costs after providing an initial estimate unless there are material changes to the project scope. Idaho has similar consumer protection rules - you should research the IPUC's precedents on interconnection cost disputes.
Following this thread with interest. Wisconsin PSC just issued new rules on interconnection cost transparency that require utilities to provide detailed cost breakdowns and justifications for any estimate changes exceeding 25%. Maybe Idaho needs similar regulations. These surprise bills are killing solar development and destroying customer trust in net metering programs.
Dan, those Wisconsin rules sound excellent. Here in Tennessee, we're seeing similar issues with TVA's interconnection process. They're notorious for lowball estimates followed by massive true-ups. A hotel in Nashville went from $6,800 estimate to $31,200 final bill because TVA claimed they needed new distribution equipment. The project became financially unviable and was cancelled after construction started.
Calvin, that Nashville case sounds like fraud. How can an estimate be off by $24,400? That's not an engineering error, that's either gross incompetence or intentional deception. I'm documenting everything with Idaho Power and preparing a detailed technical review of their original feasibility study. If they can't justify the cost increase with specific technical requirements, we're going to the IPUC.
Stan, make sure you request all internal communications and engineering notes related to both studies. Often there's evidence the utility knew about the additional requirements during the initial study but chose not to disclose them. Ameren tried that here in Illinois - we found emails showing they knew about transformer upgrades from day one but kept quiet to encourage the project.
Darlene, excellent advice. I've already submitted FOIA requests for all engineering documents related to this interconnection. If Idaho Power was hiding known requirements, that's grounds for regulatory sanctions. The client is considering cancelling the project entirely if these costs stand. It's heartbreaking to see renewable energy projects killed by utility gaming of interconnection procedures.
Stan, don't let them win by cancelling. That's exactly what some utilities want - to make solar so expensive and unpredictable that customers give up. Fight this to the end and set a precedent for other customers. Document everything and make sure the IPUC understands this is about protecting renewable energy development in Idaho.
Tina's absolutely right. These interconnection cost disputes are about more than individual projects - they're about the future of distributed generation. Utilities that can arbitrarily change costs after projects are committed are effectively killing the solar market. Stan, please keep us posted on the IPUC proceedings. This case could influence interconnection policies nationwide if you get a strong ruling.