[sheet: Cover]
Field | Value
Workbook Title | PTC Credit Calculation and Transfer Economics Model — Ridgeway Wind Project
Prepared By | Garrett Simmons, Working Associate, Calderwood & Harkness LLP
Matter Number | 1016-00008
Billing Code | 09417.00001
Date Prepared | March 2026
Client | Dunmore Energy Holdings Ltd.
Project Company | Ridgeway Wind Energy LLC (Delaware file no. 7603517)
Project | Ridgeway Wind Project — 250 MW onshore wind, Custer County, Montana
Prospective Buyer | Pinnacle Atlantic Partners LP (Delaware file no. 7255043)
Applicable IRC Sections | §§ 45, 6418
Applicable Treasury Regulations | Treas. Reg. §§ 1.45-1 through 1.45-13; 1.6418-1 through 1.6418-5
Proposed Governing Law | New York
Status | DRAFT — Scoping Phase Only; Not for Distribution
Disclaimer | This model is prepared for internal scoping purposes only and does not constitute tax advice. All figures are estimates based on P50 energy production assumptions and are subject to change. Inflation adjustments are illustrative.
Independent Engineer | Meridian Technical Advisors LLC (Dr. Paul Marlowe Commerce Bank, PE)
Tax Advisor | Grayson Birch & Co. LLP (Howard Ellison)
Counterparty Counsel | Hargrove, Liddell & Strauss LLP (Nathaniel Strauss)
Escrow Agent (Proposed) | Commonwealth Fiduciary Trust Company
Recapture Insurer (Proposed) | Northfield Specialty Insurance Co.
Insurance Broker | Corbin Hale & Associates Inc. (Steven Rask)
[sheet: Key Assumptions]
Category | Assumption | Value | Source / Reference
Project | Project Name | Ridgeway Wind Project
Project | Location | ~28,000 acres, 14 miles NE of Miles City, Custer County, Montana
Project | Nameplate Capacity (MW) | 250 | 83 × 3.0 MW turbines + 1 × 1.0 MW substation backup
Project | Net Capacity Factor (P50) | 38.2% | Meridian Technical Advisors LLC energy estimate
Project | Annual Hours | 8760
Project | Estimated Annual Generation (kWh) | 836,220,000 | 250 MW × 8,760 hrs × 0.382
Project | Commercial Operations Date (COD) | November 14, 2025 | COD certification by Meridian
Project | PTC Eligibility Period | 10 taxable years (TY2025–TY2034) | IRC § 45
Project | Total Project Cost | $412,000,000
Project | Debt (Construction-to-Term Loan, Redstone Capital Bank) | $288,400,000 | 70% LTC
Project | Equity (Dunmore Renewables Inc.) | $123,600,000 | 30% LTC
Project | Outstanding Loan Principal (Mar. 1, 2026) | $271,600,000 | Per amortization schedule
Project | PPA Counterparty | Great Plains Municipal Power Authority | PPA dated June 12, 2023
Project | PPA Price | $38.50/MWh | Fixed for 20 years
Project | MISO Queue Position | J-1147 | GIA with NorthStar Transmission Holdings LLC, Sept. 3, 2024
Credit Rate | Base PTC Rate (2025, inflation-adjusted) | $0.0055/kWh | IRC § 45(a), as adjusted
Credit Rate | Bonus Credit Multiplier | 5x | Prevailing wage + apprenticeship requirements satisfied per IRC § 45(b)(6)
Credit Rate | Adjusted Base PTC Rate | $0.0275/kWh | $0.0055 × 5
Credit Rate | Energy Community Bonus | 10% | IRC § 45(b)(11)(B); Custer County qualifies — historical fossil fuel employment census tract
Credit Rate | Effective PTC Rate | $0.03025/kWh | $0.0275 × 1.10
Inflation | Assumed Annual Inflation Escalator | 2.5% | Illustrative assumption for IRC § 45(e)(2) adjustment; actual per IRS published guidance
Transfer | Transfer Mechanism | IRC § 6418 direct transfer election
Transfer | Transfer Price | $0.92 per $1.00 of credit | Pinnacle Atlantic Partners LP indicative term sheet
Transfer | Indemnity Holdback Percentage | 15% | Of each annual transfer payment
Transfer | Holdback Release Period | 36 months | From date of each escrow deposit
Transfer | Escrow Agent | Commonwealth Fiduciary Trust Company
Transfer | IRS Registration | Pending — IRS Energy Credits Online portal, Treas. Reg. § 1.6418-4 | To be filed for TY2025
Transfer | Payment Timing | Lump-sum within 30 days after the later of pre-filing registration and annual true-up date
Buyer | Buyer | Pinnacle Atlantic Partners LP
Buyer | Avg. Annual Federal Income Tax (3-yr) | ~$480,000,000 | Sufficient to absorb credits
Buyer | Prior § 6418 Credit Purchases (Cumulative) | ~$1,200,000,000
Seller Entity | Owner Chain | DEH (Cayman, CR-284319) → Dunmore Renewables Inc. (DE, 7491826) → Ridgeway Wind Energy LLC (DE, 7603517)
Seller Entity | Callum Dunmore Equity Interest in DEH | 68% | Majority shareholder
[sheet: Annual PTC Calculation]
Taxable Year | Year Number | Nameplate Capacity MW | Net Capacity Factor P50 | Annual Hours | Est. Annual Generation kWh | Base PTC Rate $/kWh | Bonus Multiplier | Adjusted Base Rate $/kWh | Energy Community Bonus % | Effective PTC Rate $/kWh | Inflation Adjustment Factor | Inflation-Adjusted Effective Rate $/kWh | Annual PTC $ | Cumulative PTC $
TY2025 | 1 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1 | 0.03025 | 25295655 | 25295655
TY2026 | 2 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.025 | 0.031006 | 25928047 | 51223702
TY2027 | 3 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.0506 | 0.031781 | 26576248 | 77799950
TY2028 | 4 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.0769 | 0.032576 | 27240654 | 105040604
TY2029 | 5 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.1038 | 0.03339 | 27921671 | 132962275
TY2030 | 6 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.1314 | 0.034225 | 28619713 | 161581988
TY2031 | 7 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.1597 | 0.035081 | 29335206 | 190917194
TY2032 | 8 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.1887 | 0.035958 | 30068586 | 220985780
TY2033 | 9 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.2184 | 0.036857 | 30820301 | 251806081
TY2034 | 10 | 250 | 0.382 | 8760 | 836220000 | 0.0055 | 5 | 0.0275 | 0.1 | 0.03025 | 1.2489 | 0.037778 | 31590808 | 283396889
TOTAL | 283396889
[sheet: Transfer Consideration]
Taxable Year | Year Number | Annual PTC $ | Transfer Price per $1.00 Credit | Gross Transfer Consideration $ | Indemnity Holdback % | Holdback Amount $ | Net Cash to Seller at Closing $ | Cumulative Gross Consideration $ | Cumulative Holdback Escrowed $ | Cumulative Net Cash to Seller $
TY2025 | 1 | 25295655 | 0.92 | 23271803 | 0.15 | 3490770 | 19781033 | 23271803 | 3490770 | 19781033
TY2026 | 2 | 25928047 | 0.92 | 23853803 | 0.15 | 3578070 | 20275733 | 47125606 | 7068840 | 40056766
TY2027 | 3 | 26576248 | 0.92 | 24450148 | 0.15 | 3667522 | 20782626 | 71575754 | 10736362 | 60839392
TY2028 | 4 | 27240654 | 0.92 | 25061402 | 0.15 | 3759210 | 21302192 | 96637156 | 14495572 | 82141584
TY2029 | 5 | 27921671 | 0.92 | 25687937 | 0.15 | 3853191 | 21834746 | 122325093 | 18348763 | 103976330
TY2030 | 6 | 28619713 | 0.92 | 26330136 | 0.15 | 3949520 | 22380616 | 148655229 | 22298283 | 126356946
TY2031 | 7 | 29335206 | 0.92 | 26988390 | 0.15 | 4048258 | 22940132 | 175643619 | 26346541 | 149297078
TY2032 | 8 | 30068586 | 0.92 | 27663099 | 0.15 | 4149465 | 23513634 | 203306718 | 30496006 | 172810712
TY2033 | 9 | 30820301 | 0.92 | 28354677 | 0.15 | 4253202 | 24101475 | 231661395 | 34749208 | 196912187
TY2034 | 10 | 31590808 | 0.92 | 29063543 | 0.15 | 4359531 | 24704012 | 260724938 | 39108739 | 221616199
TOTAL | 283396889 | 260724938 | 39108739 | 221616199
[sheet: Indemnity Holdback Schedule]
Taxable Year of Credit | Holdback Deposit Date (approx.) | Holdback Deposit Amount $ | Release Eligibility Date (36 months from deposit) | TY2025 Holdback Balance $ | TY2026 Holdback Balance $ | TY2027 Holdback Balance $ | TY2028 Holdback Balance $ | TY2029 Holdback Balance $ | TY2030 Holdback Balance $ | TY2031 Holdback Balance $ | TY2032 Holdback Balance $ | TY2033 Holdback Balance $ | TY2034 Holdback Balance $ | TY2035 Holdback Balance $ | TY2036 Holdback Balance $ | TY2037 Holdback Balance $ | Total Escrow Outstanding at Year-End $
TY2025 | Q2 2026 | 3490770 | Q2 2029 | 3490770 | 3490770 | 3490770 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
TY2026 | Q2 2027 | 3578070 | Q2 2030 | 0 | 3578070 | 3578070 | 3578070 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
TY2027 | Q2 2028 | 3667522 | Q2 2031 | 0 | 0 | 3667522 | 3667522 | 3667522 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
TY2028 | Q2 2029 | 3759210 | Q2 2032 | 0 | 0 | 0 | 3759210 | 3759210 | 3759210 | 0 | 0 | 0 | 0 | 0 | 0 | 0
TY2029 | Q2 2030 | 3853191 | Q2 2033 | 0 | 0 | 0 | 0 | 3853191 | 3853191 | 3853191 | 0 | 0 | 0 | 0 | 0 | 0
TY2030 | Q2 2031 | 3949520 | Q2 2034 | 0 | 0 | 0 | 0 | 0 | 3949520 | 3949520 | 3949520 | 0 | 0 | 0 | 0 | 0
TY2031 | Q2 2032 | 4048258 | Q2 2035 | 0 | 0 | 0 | 0 | 0 | 0 | 4048258 | 4048258 | 4048258 | 0 | 0 | 0 | 0
TY2032 | Q2 2033 | 4149465 | Q2 2036 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4149465 | 4149465 | 4149465 | 0 | 0 | 0
TY2033 | Q2 2034 | 4253202 | Q2 2037 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4253202 | 4253202 | 4253202 | 0 | 0
TY2034 | Q2 2035 | 4359531 | Q2 2038 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4359531 | 4359531 | 4359531 | 0
TOTAL OUTSTANDING | 39108739 | 3490770 | 7068840 | 10736362 | 11004802 | 11279923 | 11561921 | 11850969 | 12147243 | 12450925 | 12762198 | 8612733 | 4359531 | 0
Notes: | All holdback funds held by Commonwealth Fiduciary Trust Company per escrow agreement. Holdback secures recapture and disallowance indemnities under proposed Transfer Agreement. Recapture insurance from Northfield Specialty Insurance Co. (brokered by Corbin Hale & Associates Inc. / Steven Rask) intended as additional backstop.
[sheet: Sensitivity Analysis]
Metric | $0.88 per $1.00 | $0.90 per $1.00 | $0.92 per $1.00 | $0.94 per $1.00
Transfer Price ($ per $1.00 credit) | 0.88 | 0.9 | 0.92 | 0.94
--- NOMINAL (No Inflation Adjustment) ---
Annual PTC (Year 1, nominal) | 25295655 | 25295655 | 25295655 | 25295655
10-Year Aggregate PTC (nominal) | 253000000 | 253000000 | 253000000 | 253000000
Year 1 Gross Transfer Consideration | 22260176 | 22766090 | 23271803 | 23777916
10-Year Aggregate Gross Consideration (nominal) | 222640000 | 227700000 | 232760000 | 237820000
Year 1 Holdback (15%) | 3339026 | 3414913 | 3490770 | 3566687
10-Year Aggregate Holdback (nominal) | 33396000 | 34155000 | 34914000 | 35673000
Year 1 Net Cash to Seller | 18921150 | 19351177 | 19781033 | 20211229
10-Year Aggregate Net Cash (nominal) | 189244000 | 193545000 | 197846000 | 202147000
Discount to Face Value (total) | 12.0% | 10.0% | 8.0% | 6.0%
--- WITH 2.5% ILLUSTRATIVE INFLATION ---
10-Year Aggregate PTC (inflation-adj.) | 283396889 | 283396889 | 283396889 | 283396889
10-Year Aggregate Gross Consideration (inflation-adj.) | 249389262 | 255057200 | 260724938 | 266392876
10-Year Aggregate Holdback (inflation-adj.) | 37408389 | 38258580 | 39108739 | 39958931
10-Year Aggregate Net Cash (inflation-adj.) | 211980873 | 216798620 | 221616199 | 226433945
Buyer's Implied Savings per $1.00 of Credit | 0.12 | 0.1 | 0.08 | 0.06
--- BUYER CAPACITY CHECK ---
Pinnacle Avg. Annual Fed. Income Tax | 480000000 | 480000000 | 480000000 | 480000000
Year 1 PTC as % of Buyer's Avg. Tax | 5.3% | 5.3% | 5.3% | 5.3%
Buyer Headroom (Avg. Tax − Year 1 PTC) | 454704345 | 454704345 | 454704345 | 454704345
Buyer Prior § 6418 Purchases (Cumulative) | ~$1,200,000,000 | ~$1,200,000,000 | ~$1,200,000,000 | ~$1,200,000,000