| 9-5-25 | Comments on the Antidegradation Alternatives Analysis for Interstate Power and Light in Ottumwa |
| 7-2-25 | Comments on National Pollutant Discharge Elimination System (NPDES) Permit for Ottumwa |
| 6-27-25 | Comments on the 2025 Air Monitoring Network Assessment |
| 6-12-25 | Comments on the Iowa Ambient Air 2025 Network Plan |
| 9-3-24 | Comments on EPA’s Proposed Approval of Iowa’s Draft State
Implementation Plan Regional Haze Second Implementation Period |
| 6-14-24 | Comments on the Iowa Ambient Air 2024 Network Plan |
| 6-7-24 | Comments on DNR’s Proposal to Renew the Operating Permit
for MidAmerican Energy Company – George Neal South Plant |
| 5-21-24 | Comments in support of the IUB's proposal to rescind the Chapter 30 rules on Clean Energy Verification |
| 5-10-24 | Comments on Chapter 107 Unified Development Code (UDC) Text Amendments for Utility-Scale Wind (Linn Co.) |
| 5-3-24 | Comments on the Draft NPDES Permit No. 9000101 for Interstate Power & Light Ottumwa Generating Station |
| 4-25-24 | Environmental and Community Group Comments on 2023 SIP Call |
| 4-16-24 | Direct Testimony of Steven C. Guyer (Alliant Rate Case) |
| 3-26-24 | Comments on IUB Competitive Bidding Rules |
| 11-9-23 | Joint Letter to IUB on integrated resource planning |
| 8-16-23 | Comments in Chapter 107 Unified Development Code (UDC) Text Amendments for Utility-Scale Solar Installations (Linn Co.) |
| 5-3-23 | Direct Testimony of Steven C. Guyer on Behalf of Iowa Environmental Council |
| 3-16-23 | Comments on Iowa State Implementation Plan for Regional Haze Second Implementation Period (2019-2028) |
| 12-16-22 | Environmental Intervenors' Comments on Proposed MidAmerican Settlement |
| 11-21-22 | Supplemental Direct and Rebuttal Testimony of Devi Glick RPU-2022-0001 |
| 11-21-22 | Supplemental Direct Testimony of Chelsea Hotaling RPU-2022-0001 |
| 11-21-22 | Supplemental Direct and Rebuttal Testimony of Steven Guyer RPU-2022-0001 |
| 10-3-22 | Objection to MidAmerican Application for Confidential Treatment |
| 9-2-22 | Motion to Compel RPU-2022-0001 |
| 8-2-21 | Comments on Investigation into a Comprehensive Plan for Iowa's Transmission Grid of the Future |
| 4-8-21 | Comments on Technical Conference and MidAmerican's Additional Information |
| 3-4-21 | Additional Joint Comments on IUB Chapter 26 rules "Rate Cases, Tariffs, and Rate Regulation Election Practice and Procedure |
| 1-21-21 | Reply Testimony of David B. Posner EPB-2020-0156 |
| 1-21-21 | Reply Testimony of Steven C. Guyer EPB-2020-0156 |
| 1-11-21 | Joint Additional Comments on IUB’s Regulation of Electric Vehicle Charging, chapter 20.20 |
| 12-17-20 | Testimony of David B. Posner EPB-2020-0156 |
| 12-17-20 | Testimony of Steven C. Guyer EPB-2020-0156 |
| 12-8-20 | Joint Comments on IUB’s Regulation of Electric Vehicle Charging, Chapter 27 |
| 12-8-20 | Joint Comments on IUB’s Regulation of Electric Vehicle Charging, 20.20 |
| 9-1-20 | Joint Comments on IUB Chapter 26 rules "Rate Cases, Tariffs, and Rate Regulation Election Practice and Procedure" |
| 8-24-20 | Joint Comments on IUB's Regulation of Municipal Electric Utilities and Electric Cooperatives |
| 8-14-20 | Joint Comments on IUB's Rule Making for Electric Service Rules |
| 7-22-20 | Joint comments on EPA's Air Plan Approval; Iowa; Air Quality Implementation Plan - Muscatine Sulfur Dioxide Nonattainment Area and Start-Up, Shutdown, Malfunction SIP Call Withdrawal |
| 7-1-20 | Comments on State of Iowa Long-Range Transit Plan |
| 2-4-20 | Comments on Rule Making for Ratemaking Principles Proceeding |
| 11-26-19 | EIS Comments on Draft Compatibility Determination for the Cardinal-Hickory Creek Project |
| 11-15-19 | Rebuttal Testimony of Nathaniel Baer E-22386 |
| 10-1-19 | Revised Testimony of Nathaniel Baer E-22386 |
| 9-10-19 | Rebuttal Testimony of Kerri Johannsen |
| 8-1-19 | Testimony of Uday Varadarajan |
| 8-1-19 | Testimony of Kerri Johannsen |
| 7-10-19 | Initial Comments on Rule Making for Electric Service Rules |
| 6-5-19 | Initial Post-Workshop Comments on Review of Energy Efficiency Planning and Cost Review Rules |
| 3-25-19 | Reply Comments on Electric Vehicle Infrastructure |
| 3-7-19 | Comments on Electric Vehicle Infrastructure |
| 3-1-19 | Comments on Review of Energy Efficiency Planning and Cost Review Rules |
| 11-9-18 | Surrebuttal Testimony of Kerri Johannsen |
| 10-2-18 | Rebuttal Testimony of Kerri Johannsen |
| 9-17-18 | Comments on Electric Vehicle Infrastructure |
| 12-8-17 | Reply Comments on Review of Energy Efficiency Planning and Cost Review Rules |
| 11-27-17 | Comments on Review of Energy Efficiency Planning and Cost Review Rules |
| 9-1-17 | Proposed solar regulations in the Public Review Draft of the City’s zoning update |
| 9-29-17 | INTERSTATE POWER AND LIGHT NEW WIND II PROPOSAL RPU-2017-0002 |
| 8-1-17 | Testimony of Karl Rabago RPU-2017-0001 |
| 8-1-17 | Testimony of Graeme Miller RPU-2017-0001 |
| 8-1-17 | Testimony Paul Chernick RPU-2017-0001 |
| 6-9-17 | Mid American Energy Reply Comments DRU-2017-0002 |
| 6-1-17 | Mid American Energy Initial Comments DRU-2017-0002 |
| 4-28-17 | Joint Reply Comments – MidAmerican Renewable Verification DRU-2017-0001 |
| 4-28-17 | Letter of Support for MVP 7 E-22269 |
| 4-27-17 | Alliant Emissions Plan & Budget – Direct Testimony of Nathaniel Baer EPB-2016-0150 |
| 4-21-17 | Joint Comments – MidAmerican Renewable Verification DRU-2017-0001 |
| 4-19-17 | Coalition Response Comments – Alliant Net Metering Pilot Proposal TF-2016-0321 |
| 3-23-17 | Joint Comments – Iowa Utilities Board Chapter 35 Rule Revisions Workshop (Energy Efficiency) RMU-2016-0018 |
| 2-27-17 | Joint Comments – Avoided Costs (Alliant) TF-2016-0290 |
| 2-27-17 | Joint Comments – Avoided Costs SPU-2017-0003 |
| 2-27-17 | Joint Comments – Avoided Costs (MidAmerican) TF-2016-0294 |
| 2-23-17 | Coalition Petition for Rehearing and Motion for Clarification – Alliant Net Metering Pilot Proposal TF-2016-0321 |
| 1-17-17 | Joint Comments – Iowa Utilities Board Chapter 45 Rulemaking (Interconnection) RMU-2016-0003 |
| 1-6-17 | Comments – USDA RUS Environmental Impact Statement Scoping for MVP 5 |
| 12-2-16 | IEC Letter of Support – MVP 5 Study |
| 11-7-16 | Joint Reply Comments – Iowa Utilities Board Chapter 45 Rulemaking (Interconnection) RMU-2016-0003 |
| 10-25-16 | Joint Net-to-Gross Plan Status Report EEP-2012-0001 and EEP-2012-0002 |
| 9-30-16 | Joint Motion for Approval of Technical Reference Manual EEP-2012-0001 and EEP-2012-0002 |
| 9-22-16 | Joint Reply Comments – Iowa Utilities Board Chapter 35 Rule Revisions (Energy Efficiency) RMU-2016-0018 |
| 9-22-16 | Joint Comments – Alliant Energy Avoided Costs TF-2016-0290 |
| 9-20-16 | Coalition Comments – MidAmerican Net Metering Pilot Proposal TF-2016-0323 |
| 9-20-16 | Coalition Comments – Alliant Net Metering Pilot Proposal TF-2016-0321 |
| 9-16-16 | Alliant New Wind Project – Direct Testimony of Tom Wind RPU-2016-0005 |
| 9-16-16 | Alliant New Wind Project – Direct Testimony of Nathaniel Baer RPU-2016-0005 |
| 9-15-16 | Joint Comments – MidAmerican Avoided Costs TF-2016-0294 |
| 9-7-16 | Joint Comments – Iowa Utilities Board Chapter 35 Rule Revisions (Energy Efficiency) RMU-2016-0018 |
| 9-6-16 | Joint Comments – Iowa Utilities Board Chapter 45 Rulemaking (Interconnection) RMU-2016-0003 |
| 9-2-16 | Joint Reply Comments – Iowa Utilities Board Chapter 15 Rule Revisions (Distributed Generation) RMU-2016-0006 |
| 8-18-16 | Joint Comments – Iowa Utilities Board Chapter 15 Rule Revisions RMU-2016-0006 |
| 7-11-16 | Letter of Support for MVP 4 E-22116 et al |
| 6-21-16 | Wind XI Direct Testimony - Iowa Environmental Council Energy Program Director Nathaniel Baer DOCKET NO. RPU-2016-0001 |
| 6-21-16 | Wind XI Direct Testimony - Des Moines Mayor Frank Cownie DOCKET NO. RPU-2016-0001 |
| 6-21-16 | Wind XI Direct Testimony - Thomas A. Wind, Wind Utility Consulting DOCKET NO. RPU-2016-0001 |
| 4-20-16 | Coalition Response to Utility DG Pilot Proposals NOI-2014-0001 |
| 1-21-16 | Public Comments Regarding the Clean Power Plan – IEC (EPA-HA-OAR-2015-0199) |
| 1-4-16 | Petition to Intervene and Comments on Interconnection Waiver – IEC and ELPC (WRU-2015-0038-0156) |
| 12-14-16 | Letter in Support of Clean Line Motion to Establish Procedural Schedule – IEC (E-22123, etc.) |
| 9-22-16 | Review of Cogeneration and Small Power Production Rules Reply Comments RMU-2016-0006 |
| 9-22-16 | Interstate Power and Response Light Company Response TF-2016-0290 |
| 12-1-15 | Joint Public Reply Comments Regarding Proposed Changes to Interconnection Rules – IEC, ELPC, IREC (NOI-2014-0001) |
| 11-23-15 | Joint Public Additional Comments Regarding Wind and Renewable Energy Tax Credits – IEC, ELPC, ISETA, Winneshiek Energy District (NOI-2015-0001) |
| 11-6-15 | Joint Public Comments Regarding Proposed Changes to Interconnection Rules - IEC, ELPC, IREC (NOI-2014-0001) |
| 11-6-15 | Joint Public Comments Regarding Proposed Changes to Interconnection Rules - IEC, ELPC, IPL, MEC (NOI-2014-0001) |
| 9-25-15 | Joint Public Comments Regarding Wind and Renewable Energy Tax Credits - IEC, ELPC, ISETA, Winneshiek Energy District (NOI-2015-0001) - September comments |
| 8-04-15 | Petition to Intervene and Objection to Pella Cooperative Electric Tariff for Self-Generating Customers - IEC, ELPC, Iowa IPL, ISETA, SEIA, Vote Solar, Bryce Engers, Mike Lubberden (TF-2015-0305) |
| 7-29-15 | Petition to Intervene and Motion to Dismiss Alliant Policy for Net Metering for Third-Party Purchase Agreements - IEC, ELPC, Iowa IPL, ISETA, SEIA, Winnisheik Energy District (FCU-2015-0009) |
| 7-15-15 | Joint Public Comments Regarding June 15 Comments Pertaining to Distributed Energy - IEC, ELPC, ISETA, SEIA, Sierra Club, Vote Solar (NOI-2014-0001) - Round 8 |
| 6-09-15 | Testimony Supporting and Expanding on Aspects of Wind X Proposal - Baer - IEC, ELPC (RPU-2015-0002) |
| 6-15-15 | Joint Public Comments Regarding Proposed Changes to Distributed Energy - IEC, ELPC, ISETA, SEIA, Sierra Club, Vote Solar (NOI-2014-0001) - Round 7 |
| 4-07-15 | Joint Public Comments Regarding Proposed Changes to Interconnection Rules - IEC, ELPC, IREC (NOI-2014-0001) - Round 6 |
| 4-07-15 | Joint Public Comments Regarding Proposed Changes to Interconnection Rules - IEC, ELPC, IPL, MEC (NOI-2014-0001) - April comments |
| 2-16-15 | Joint Public Comments Regarding Proposed Changes to Interconnection Rules - IEC, ELPC, IREC, (NOI-2014-0001) - Round 5 |
| 12-22-14 | Joint Public Comments Regarding Proposed Changes to Distributed Energy - IEC, ELPC (NOI-2014-0001) - Round 4 |
| 12-01-14 | Comments Supporting Proposed Clean Power Plan - IEC (EPA-HQ-OAR-2013-0602) |
| 10-24-14 | Joint Public Comments Regarding Proposed Changes to Distributed Energy - IEC, ELPC, ISETA, SEIA, Sierra Club, Vote Solar (NOI-2014-0001) - Round 3 |
| 6-24-14 | Joint Public Comments Regarding Proposed Changes to Distributed Energy - IEC, ELPC, IREC, ISETA, SEIA, Sierra Club, Vote Solar (NOI-2014-0001) - Round 2 |
| 2-26-14 | Joint Public Comments Regarding Proposed Changes to Distributed Energy - IEC, ELPC, IREC, ISETA, SEIA, Sierra Club, Vote Solar (NOI-2014-0001) - Initial Comments |
| 9-10-13 | Testimony Conveying Concerns Regarding MidAmerican Proposed Treatment of LED Street Lights - Baer - IEC, ELPC (RPU-2013-0004) |
| 9-10-13 | Testimony Regarding MidAmerican Standby Rates - Miller - IEC, ELPC (RPU-2013-0004) |