Agrivoltaic Solar Profitability Calculator (2026 Korea Edition)

How much do you actually make when you put solar panels over a rice paddy? Let’s get into the numbers.

What Is Agrivoltaics?

Agrivoltaics (영농형 태양광, yeongnonghyeong taeyangwang) refers to the dual use of agricultural land for both crop cultivation and solar power generation. Panels are mounted 3–5 meters above the ground on tall structural frames, allowing approximately 70% of sunlight to reach the crops while the remaining 30% is captured for power generation.

South Korea introduced the concept in 2016, and as of late 2025, approximately 90 demonstration projects are actively operating nationwide. The model addresses two concurrent rural crises: the collapse of farm household income and the national push toward carbon neutrality by 2050.

Key Terms Explained

CAPEX (Capital Expenditure)

The one-time upfront investment required to build the installation. This includes modules, inverters, structural framing (poles and rails), electrical wiring, grid connection fees, and administrative/permitting costs.

2026 Agrivoltaic CAPEX Benchmarks:

Capacity	Cost per kW	Total Investment	Notes
100 kW	~1,371–1,777 KRW/kW	~140–178 million KRW	Farmland-owned basis
1 MW	~1,590 KRW/kW	~1.59 billion KRW	~12% economies-of-scale reduction

Agrivoltaic installations cost approximately 1.5x more than conventional rooftop or ground-mount solar due to the elevated structure requirements for agricultural machinery access.

OPEX (Operational Expenditure)

Annual recurring costs to keep the system running: labor, inspection and maintenance, insurance, meter rental, and administrative overhead.

Annual OPEX Reference Values:

Capacity	Per-kW Annual Cost	Total Annual Cost
100 kW	~30,510 KRW/kW-yr	~3.05 million KRW
1 MW	~23,114 KRW/kW-yr	~23.11 million KRW

OPEX grows annually with inflation (assumed 1.62%). Inverter replacement is required every 10 years and should be budgeted as a recurring CAPEX event. Panel output degrades at 0.54% per year.

SMP (System Marginal Price, 계통한계가격)

The wholesale electricity price that generators receive when selling power into the national grid. SMP fluctuates hourly based on power supply-demand dynamics and fuel input costs (primarily LNG).

Recent SMP Trend (Mainland Korea):

Period	Average SMP (KRW/kWh)
September 2025	111.85
December 2025	89.77 (seasonal dip)
January 20, 2026	109.11
January 30, 2026	111.79
March 2026	109.79

Annual SMP averages in the range of 100–115 KRW/kWh under current market conditions.

REC (Renewable Energy Certificate, 신재생에너지 공급인증서)

Generating 1 MWh (= 1,000 kWh) of solar power earns one REC. These certificates are sold to obligated power suppliers under Korea’s Renewable Portfolio Standard (RPS) system, providing a second revenue stream on top of SMP.

1 REC = 1 MWh. At 70,000 KRW/REC, this translates to 70 KRW/kWh of additional revenue.

Recent REC Price Data (Mainland Korea):

Period	REC Price (KRW/REC)	kWh Equivalent
September 2025	71,997	~72.0 KRW/kWh
2025 Annual Average	70,000–80,000	70–80 KRW/kWh
January 2026	71,700	~71.7 KRW/kWh
March 2026	70,356	~70.4 KRW/kWh

REC Multipliers

The RPS system applies multipliers to REC issuance based on installation type and scale. Agrivoltaics currently does not have a dedicated multiplier and follows the standard ground-mount schedule.

Capacity	REC Multiplier	Notes
< 100 kW	1.2	Small-scale premium
100 kW – 3,000 kW	1.0	Standard
> 3,000 kW	0.8	Large-scale penalty
Community-based (≥500 kW)	Base + up to 0.2	Cooperative/resident participation

Advocacy groups continue to push for a dedicated agrivoltaic multiplier, but as of April 2026, no separate multiplier has been implemented.

Self-Consumption Revenue Split

Self-consumption means using generated electricity on-site (farmhouse, smart farm, cold storage) rather than selling it to the grid. Revenue is realized as electricity bill savings instead of direct cash receipts.

Decision rule: If utility electricity tariff > SMP → self-consumption is more valuable. If tariff < SMP → grid export is more valuable. Well-designed agrivoltaic systems integrated with smart farms have demonstrated electricity bill reductions exceeding 70% per month.

Revenue Formula and Sample Calculation

Base Revenue Formula

Annual Generation Revenue = Annual Output (kWh) × (SMP (KRW/kWh) + [REC Price (KRW/REC) ÷ 1,000 × Multiplier])

100 kW System — March 2026 Spot Prices:

Capacity utilization rate: 15.38%
Annual output: 100 kW × 8,760 hrs × 15.38% ≈ 134,729 kWh
SMP: 109.79 KRW/kWh
REC multiplier 1.2: 70,356 ÷ 1,000 × 1.2 = 84.43 KRW/kWh
Combined rate: 109.79 + 84.43 = 194.22 KRW/kWh
Gross annual revenue: 134,729 × 194.22 ≈ 26.17 million KRW
Annual OPEX: 3.05 million KRW
Net annual generation income: ~23.1 million KRW

A real-world site (August 2025 benchmark, 100 kW) reported approximately 26.6 million KRW annual revenue (~2.21 million KRW/month).

Parallel Agricultural Income

Jeonnam Yeongam County pilot (November 2024 – October 2025, ~2,310 m² paddy):

Solar generation revenue (estimated): 8.97 million KRW
Rice harvest shortfall (21% yield reduction): -250,000 KRW
Net income increase: 8.72 million KRW
Compared to rice-only farming on the same plot: 8.4× total revenue

Note: This pilot figure excludes installation costs. Meaningful income improvement at farm level begins approximately 7 years post-installation.

Scenario Analysis (100 kW, 20-Year Operation)

Based on Korea Energy Economics Institute (KEEI) academic analysis, 2024.

Scenario A: 100% Equity Financing

Scenario	Operating Term	NPV (mil. KRW)	B/C Ratio	IRR
Current Farmland Act (8 years)	8 yrs	-58.4	0.71	-3.3%
Reference Case (20 years)	20 yrs	+29.5	1.12	6.5%
Extended (30 years)	30 yrs	+66.9	1.25	7.9%

An 8-year operating term produces a negative NPV under all conditions. A minimum of 20 years is required for economic viability.

Scenario B: 90% Debt Financing at 2.25% Interest

Scenario	Operating Term	NPV (mil. KRW)	B/C Ratio	IRR
Current Farmland Act (8 years)	8 yrs	-33.0	0.81	13.0%
Reference Case (20 years)	20 yrs	+61.2	1.29	75.0%
Extended (30 years)	30 yrs	+98.6	1.42	75.0%

Leveraged financing doubles the NPV versus all-equity when the borrowing rate (2.25%) stays below the discount rate (4.5%).

Sensitivity Analysis

1. SMP + REC Price Sensitivity (100 kW, 20-Year)

Price Scenario	NPV — Equity (mil.)	NPV — Financed (mil.)	B/C (Financed)
+10% increase	54.1	85.8	1.40
Base case	29.5	61.2	1.29
-10% decrease	4.9	36.6	1.18

Every 10% movement in SMP+REC prices shifts NPV by approximately 24.6 million KRW in either direction. This is the single largest sensitivity driver.

2. Operating Term (Permit Duration) Sensitivity

Permit Term	NPV — Equity (mil.)	Economic Verdict
8 years	-58.4	Not viable
20 years	+29.5	Minimum threshold
23 years (target)	~+45 (est.)	Target under 2026 law
30 years	+66.9	Optimal

Each additional year of operation adds approximately 3–4 million KRW in NPV. Regulatory change is a direct profitability lever.

3. Financing Condition Sensitivity (100 kW, 20-Year)

Condition	NPV (mil. KRW)	B/C
Base (2.25% rate, 5-yr grace)	61.2	1.29
No grace period	47.4	1.21
Rate raised to 4.5%	33.8	1.14
4.5% rate + 70% LTV	32.9	1.14

Doubling the interest rate (2.25% → 4.5%) erodes NPV by 27.4 million KRW. Access to subsidized policy financing is critical.

4. Scale-Up Sensitivity (1 MW, Financed)

Scenario	NPV (mil. KRW)	B/C
1 MW — 20-year base	751.6	1.41
1 MW — 30-year	1,149.3	1.57
1 MW — Community (+0.2 REC)	894.3	1.49

Scaling to 1 MW yields an NPV more than 10× larger than 100 kW, driven by economies of scale reducing per-kW CAPEX and OPEX.

2026 Regulatory Changes and Profitability Impact

The most consequential policy development for 2026 is the push to extend the farmland temporary use permit from 8 to 23 years. At the Second Core Regulatory Reform Strategy Meeting (October 16, 2025), the government announced:

Permit term extended: 8 years → 23 years (structured as 8 + 5 + 5 + 5 years)
Renewable Energy Zones permitted within agricultural promotion areas
Village cooperatives and regional legal entities eligible as project operators
Structural standards codified: 2.5m minimum height, 3m column spacing, ≤30% module area coverage

Energy Act amendments targeted for completion by end of 2025; Farmland Act amendments targeted for H1 2026. As of April 2026, parliamentary subcommittee deliberations continue.

The 23-year term improvement alone is estimated to lift NPV by approximately 15 million KRW (equity basis), transforming marginal projects into economically sound investments.

Payback Period Summary

Conditions	Payback Period
100 kW, all equity, spot market	~14–15 years
100 kW, 90% financed, low rate	~7–10 years
1 MW, financed	~7–9 years
Pilot evidence (Yeongam, Jeonnam)	Meaningful income shift after year 7

Investment Checklist

Before running any profitability model, these variables must be fixed:

Capacity (kW): Derive from available land area and shading analysis
Net installed cost (KRW/kW): Vendor quotes minus subsidies and policy loans
Annual output (kWh/yr): Regional solar irradiance × capacity × utilization factor (~15–16%)
Revenue rate: SMP + (REC × multiplier) — spot market vs. fixed-price contract
Operating term: Currently 8 years; anticipate 23 years pending legislation
Financing structure: Equity ratio, interest rate, grace period
Discount rate: Social rate 4.5% or individual hurdle rate
Self-consumption allocation: Factor in electricity bill savings for smart farm or cold storage loads

References

#	Source	Publisher
1	Policy Directions to Enhance Economic Feasibility of Agrivoltaics in Korea (2024)	Korea Energy Economics Institute, New & Renewable Energy journal
2	Mid-to-Long-Term LCOE Forecast for Renewable Energy Expansion (2025)	Korea Energy Economics Institute
3	The Future of Agrivoltaic Projects in Korea (2023)	Korea Rural Economic Institute (KREI)
4	March 2026 Solar SMP/REC Price Trends	Haezoom Blog
5	January 2026 SMP·REC Daily Price Report	Iaan Solar Blog
6	Agrivoltaics: 2026 Outlook	Gekko System
7	Agrivoltaic Demonstration Revenue 8× Higher Than Rice-Only Farming (2025.11)	Korea Energy Service / HaizonTV
8	7 Things to Check Before Installing Agrivoltaics (2026)	IMUN Farm
9	Profitability Analysis of Rural Fence-Type Solar Projects (2025)	New & Renewable Energy journal
10	Government Policy and Recent Trends in Agrivoltaics (2026.02)	Cheongbuk Innovation City Forum
11	Agrivoltaic Farmland Use Period: 8→23 Years	Hanbit Energy, 2026

All profitability figures in this document are based on 2024–2026 pilot, academic, and market data. Actual results will vary based on site-specific solar irradiance, power market conditions, interest rates, and regulatory implementation timing.