---
title: "Blueberry Agro-Photovoltaics: 1-Acre Techno-Economic Brief"
url: https://kwhlab.org/articles/blueberry-agrivoltaics/
date: 2026-11-04
content_status: real
---

# Blueberry Agro-Photovoltaics: 1-Acre Techno-Economic Brief

Willamette Valley / Portland, OR (45.3°N–45.5°N) · 5-Scenario Cash-Flow, Geometry & Break-Even Analysis

LER = 1.34 · Fastest Solar Payback: 11.2 Yrs (8.2 Yrs w/ REAP)

Basis: 1-Acre Perfect Square (208.71 ft × 208.71 ft · 43,560 sq ft)

Written by kWhL

## 1. Highest Land Productivity (LER 1.34)

Pairing **6 North–South vertical bifacial rows (288 panels / 158.4 kWdc)** with **18 blueberry rows** retains **85.5%** of pure-farm fruit yield plus **48.2%** of tracker solar MWh—earning **$42,381/yr gross ($24,022/yr net)**, **2.6×** pure berry profit.

## 2. Fastest Solar Break-Even (11.2 Yrs)

With zero motors, slew drives, or actuators, fixed vertical Agri-PV needs **$69k–$140k less net CAPEX** than fixed-tilt or 0.35 GCR tracker options—breaking even in **11.2 yrs** (30% ITC) or **8.2 yrs** when stacked with a 25% USDA REAP farm grant.

## 3. Solves the 6-Year Crop Ramp

Newly planted blueberries produce zero commercial fruit in Years 1–2 and take 7 years to mature. Vertical solar generates **+$16,181/yr net cash on Day 1** while keeping 33 ft lanes permanently open for over-the-row straddle harvesters.

## 1. SOLAR PHYSICS REALITY CHECK: SPECIFIC YIELD IN WESTERN OREGON (WH / W / YR)

45.5°N TMY Irradiance · ~50% Diffuse Sky Fraction

**Correcting the "735 Wh/W (-53%)" Claim:** Dropping from **1,125 Wh/W** (optimal south fixed-tilt) to **735 Wh/W** is a **34.7% reduction** (390 ÷ 1,125, not 390 ÷ 735 = 53%)—and 735 Wh/W models a *one-sided monofacial wall*.

**East–West Bifacial Recovery (1,010 Wh/W):** Commercial **85% glass-glass bifacial** modules harvest morning beam sun on the East face, late-afternoon sun on the West face, and scattered sky light on *both* faces all day—trailing south fixed-tilt by only **10.2%**.

**Twin-Peak Grid Value ($0.115 vs. $0.105/kWh):** Vertical E–W output peaks at **7–10 AM** and **4–7 PM**, avoiding midday wholesale solar cannibalization and aligning with utility Time-of-Use (TOU) ramps.

![S2: Standard 1-Axis Tracker Only (0.35 GCR) 1,340 Wh/W (+19.1%) S5: 1-Axis Tracker (0.35 GCR) + Berries (net harvest stow) 1,325 Wh/W (+17.8%) S4: Optimal South Fixed Tilt (~35° Tilt Baseline) 1,125 Wh/W (Baseline) S3: East–West Vertical Bifacial + Berries (85% Bifaciality) 1,010 Wh/W (-10.2%) One-Sided Vertical Panel (Monofacial Modeling Error) 735 Wh/W (-34.7%)](https://kwhlab.org/assets/articles/blueberry-agrivoltaics/fig1_specific_yield.png)

## 2. FIVE-SCENARIO MASTER TECHNO-ECONOMIC COMPARISON (1-ACRE SQUARE)

550 Wdc Bifacial Modules · OSU Commercial 'Calypso' Blueberry Budgets

| Metric (1 Acre = 43,560 sq ft) | S1: Berries Alone | S2: 1-Axis Tracker PV | S4: South Fixed-Tilt PV | S3: Vertical PV + Berries | S5: 0.35 GCR Tracker + Berries |
|---|---|---|---|---|---|
| Solar Array Size (550 Wdc Panels) | 0 | 450 (247.5 kW) | 450 (247.5 kW) | 288 (158.4 kW) | 432 (237.6 kW) |
| Row Pitch / Collector GCR | 10 ft crop pitch | 21.3 ft (0.35 GCR) | 39.5 ft (0.36 GCR) | 33.0 ft alleys | 21.3 ft (0.35 GCR) |
| Year-1 Electricity Output | 0 kWh | 331,650 kWh | 278,438 kWh | 159,984 kWh | 314,820 kWh |
| Blueberry Rows / Mature Yield (Yr 7+) | 20 (17,000 lbs) | 0 (0 lbs) | 0 (0 lbs) | 18 (14,535 lbs) | 10 (6,630 lbs)* |
| Mature Gross Revenue / Yr | $28,050 | $34,823 | $29,236 | $42,381 | $43,996 |
| Mature Cash Operating Cost / Yr | $18,850 | $5,445 | $3,713 | $18,359 | $13,545 |
| Mature Net Cash Flow / Yr | $9,200 | $29,378 | $25,523 | $24,022 | $30,451 |
| Upfront Gross CAPEX (0% Unsubsidized) | $24,500 | $482,625 | $415,800 | $307,170 | $511,210 |
| Upfront Net CAPEX (w/ 30% Solar ITC) | $24,500 | $337,838 | $291,060 | $221,634 | $361,522 |
| Cash Break-Even (w/ 30% Solar ITC) | 8.2 yrs | 11.8 yrs | 11.7 yrs | 11.2 yrs (Fastest PV) | 12.9 yrs (Slowest) |
| Cash Break-Even (0% Unsubsidized) | 8.2 yrs | 17.1 yrs | 17.0 yrs | 14.9 yrs | 18.1 yrs |
| Break-Even (30% ITC + 25% USDA REAP) | Ineligible | Ineligible | Ineligible | 8.2 yrs ($150.4k) | 8.6 yrs* ($236.8k) |
| 25-Yr Cumulative Net Profit (30% ITC) | $154,150 | $356,085 | $308,886 | $313,359 ($385k REAP) | $341,520 ($466k*) |

**Model Basis:** Blueberries ($24.5k/ac Yr-0 establishment, 0 lbs Yrs 1–2 ramping to 17,000 lbs/ac Yr 7+, $1.65/lb blended fresh/IQF price, $6.1k/ac cultural + $0.75/lb harvest cash cost). Solar CAPEX/O&M: Fixed South ($1.68/W, $15/kW-yr); 1-Axis Tracker ($1.95/W, $22/kW-yr); Fixed Vertical ($1.80/W, $14/kW-yr); Raised 0.35 GCR Agri-Tracker ($2.10/W, $24/kW-yr); 0.4%/yr degradation; $0.105/kWh base Oregon CSP/offset rate ($0.115/kWh TOU for vertical E–W; at flat $0.105/kWh, S3 nets $22,422/yr and breaks even in 12.1 yrs). *\*S5 retains only 39% of baseline crop yield, risking disqualification from EFU dual-use permitting and USDA REAP grants.*

Blueberry Agro-Photovoltaics · 1-Acre Willamette Valley Techno-Economic Brief · Page 1 of 2

## 3. 1-ACRE DUAL-USE GEOMETRY

208.7 ft × 208.7 ft

![S3: Vertical (33 ft Alleys) 6 PV rows (288) · 18 berry rows 85.5% harvest kept (24/7 lanes) S5: 0.35 GCR (21.3 ft Alleys) 9 PV rows (432) · 10 berry rows Only 39% harvest kept (-61%)](https://kwhlab.org/assets/articles/blueberry-agrivoltaics/fig3_geometry.png)

**Harvester Bottleneck:** Active rows span 182.4 ft N–S (13.15 ft turn headlands; 48 panels/row; 2-up landscape = 8.9 ft wall in S3). Two 10 ft berry rows + 11 ft Oxbo straddle harvester + post buffers need ≥23 ft—so S5's 21.3 ft alleys fit only 1 row/alley.

## 4. 25-YEAR CUMULATIVE NET CASH FLOW (30% ITC)

Includes Yrs 1–6 Berry Ramp & 0.4%/yr PV Degradation

![+$420k +$200k $0 -$200k -$380k Yr 0 Yr 5 Yr 10 Yr 15 Yr 20 Yr 25 8.2 yr (S1 & S3+REAP) 11.7–11.8 yr (S4/S2) 11.2 yr (S3) 12.9 yr (S5) BREAK-EVEN ($0) S3 Vertical+Berries (30% ITC / dotted +REAP) S2 Tracker S4 Fixed S5 0.35 Tracker+Crop](https://kwhlab.org/assets/articles/blueberry-agrivoltaics/fig4_cashflow.png)

## For the Energy Analyst: Capital Efficiency & Siting

- **Beats Fixed-Tilt Baseline (S3 vs. S4):** S3 requires **$69,426 less net CAPEX** ($221.6k vs. $291.1k), earns **+45% higher gross revenue**, breaks even faster (11.2 vs. 11.7 yrs; **14.9 vs. 17.0 yrs unsubsidized**), and yields higher 25-yr profit ($313.4k vs. $308.9k).
- **Why 0.35 GCR Trackers Fail Dual-Use (S5):** Raising 0.35 GCR trackers + stowing controls pushes net CAPEX to **$361.5k/ac** while shading out 61% of berries—resulting in the **slowest payback (12.9 yrs)**, worse than pure trackers without crops (S2, 11.8 yrs).
- **EFU Zoning & USDA REAP Unlock:** Retaining 85.5% crop output preserves Oregon Class I–II EFU farmland eligibility and unlocks the **25% USDA REAP grant**, cutting S3 payback to **8.2 yrs ($384.6k 25-yr net)**.

## For the Farm Owner: Operations & Cash Resilience

- **Zero Moving Parts, 24/7 Equipment Access:** Unlike trackers that require motors, sensors, and software to rotate out of the way before spraying or harvesting, fixed vertical walls leave **33 ft lanes open permanently** on the farmer's schedule.
- **Eliminates the Establishment Cash Drain:** Instead of sinking to **-$34,300/ac by Year 3** waiting for young bushes to bear fruit, Day-1 solar revenue funds farm operations and boosts mature net income from **$9,200/yr to $24,022/yr per acre**.
- **Microclimate Crop Protection:** Partial morning/late-afternoon wind and heat buffering reduces Pacific Northwest summer heat-dome sunburn and cuts drip irrigation demand by ~20%.

![](https://kwhlab.org/assets/articles/blueberry-agrivoltaics/harvester_photo.png)

also the blueberry picker is the perfect size to fit in between the tracker aisles!

[Photo: Oregon State University](https://agsci.oregonstate.edu/agrivoltaics/can-agrivoltaics-integrate-blueberry-production)

## 5. REAL-WORLD FIELD REFERENCE: OREGON STATE UNIVERSITY (NWREC SOLAR HARVEST SITE)

45°16'45.5"N 122°45'07.1"W · Aurora, Oregon

![Aerial view of N–S agrivoltaic rows & wide harvester lanes at OSU NWREC](https://kwhlab.org/assets/articles/blueberry-agrivoltaics/fig5_nwrec_aerial.jpg)

Aerial view of N–S agrivoltaic rows & wide harvester lanes at OSU NWREC · Imagery © 2026 Google

**Site:** North Willamette Research & Extension Center (NWREC), Oregon State University — *15210 NE Miley Rd, Aurora, OR 97002* (Plus Code: 76JX+HR).

**Field Trial Context:** Home to OSU's 5-acre, 320 kW *Solar Harvest* facility (established 2023; 'Calypso' northern highbush blueberries planted Oct 2024 in wide straddle-harvester lanes, with first side-by-side yield & Brix results scheduled for 2027). Notice in the satellite view how wide alley geometry is mandatory for tractor and harvester passage.

**Interactive Satellite Map & Facility Links:**

📍 https://www.google.com/maps?q=45.279306,-122.751972&t=k&z=18

🏛️ https://agsci.oregonstate.edu/nwrec (OSU College of Agricultural Sciences)

**Credits & Primary Data Sources:** **(1) Satellite Map & Geolocation:** Map data and aerial imagery © 2026 Google (Google Maps Satellite View, 45°16'45.5"N 122°45'07.1"W, NWREC, Aurora, OR). **(2) Agronomic & Field Trial Reference:** Oregon State University (OSU) North Willamette Research and Extension Center *Solar Harvest Project* (Dr. Chad Higgins, Biological & Ecological Engineering; Dr. Scott Lukas, Northwest Berry Production); OSU Applied Economics Blueberry Enterprise Budgets (*AEB 0061, AEB 0062, AEB 0075, AEB 0084*). **(3) Solar PV & Tariff Benchmarks:** National Renewable Energy Laboratory (NREL) *PVWatts® v8*, *System Advisor Model (SAM)*, and Dual-Use PV Cost Benchmarks (*NREL/TP-6A20-77811 & NREL/TP-6A20-88816*); Next2Sun mid-latitude vertical bifacial benchmarks; Oregon PUC / PGE Community Solar Program (Schedule 204); IRC §48E (30% ITC) & USDA Rural Energy for America Program (REAP).

Blueberry Agro-Photovoltaics · 1-Acre Willamette Valley Techno-Economic Brief · Page 2 of 2