Iowa Interconnection Standards
|Date Last Updated||11/16/2012|
|Policy Type||Interconnection Standard|
|Policy Administrator/Contact Office||Iowa Utilities Board|
|Policy Initiation Date||5/26/2010|
|Policy Summary||Iowa has interconnection standards for systems including CHP for rate-regulated utilities (MidAmerican Energy, Interstate Power and Light, and Linn County Rural Electric Cooperative). The standards apply to distributed generation facilities, including CHP, <10 MW that are not subject to the interconnection requirements of the Federal Energy Regulatory Commission, the Midwest Independent Transmission System Operator, Inc., or the Mid-Continent Area Power Pool. Although standard interconnection rules only apply to systems <10 MW, the rules state that interconnection of larger facilities should take place using the Level 4 review process as a starting point.|
Iowa rules set four levels of review for interconnection requests. A project must meet all of the requirements of a given classification in order to be eligible for that level of expedited review:
The rules adopt IEEE 1547-2003 as the technical standard for evaluating interconnection requests. The rules also specify the technical screens which may be applied to applications at each level of review as well as time limits for different stages of the evaluation process. A lockable external disconnect switch (EDS) may be required at the utility's discretion, and the utility is permitted to make reasonable system monitoring and control requirements for systems >1 MW. All applicants are required to carry and provide proof of some type of general liability insurance as part of the interconnection agreement. For facilities >1 MW, the customer must maintain a general liability insurance policy with a limit of at least $2 million per occurrence and at least $4 million in aggregate, which also names the utility as an additional insured party. The rules also specify a procedure for dispute resolution.
- Tier 1: applies to lab-certified, inverter-based systems <10 kW. Application fees are set at $50.
- Tier 2: applies to lab-certified systems <2 MW, connected to a radial distribution network or a spot network serving one customer. Application fees are set at $100 plus $1 per kW.
- Tier 3: applies to lab-certified, inverter-based systems <50 kW which are connected to an area network and which will not export power, or lab-certified, non-exporting systems connected to a radial distribution circuit that are <10 MW. Application fees are set at $500 plus $2 per kW.
- Tier 4: applies to systems <10 MW that do not meet the criteria for inclusion in a lower tier, including all systems using non-lab-certified components and those that require additional construction by the utility in order accommodate the facility. Application fees are set at $1,000 plus $2 per kW.
|CHP Eligibility Requirements||Both fossil-fueled and renewably-fueled CHP systems are eligible for standardized interconnection.|
|Eligible Project Size (MW)||Standardized interconnection applies to systems <10 MW.|
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