Solar and Battery Storage: Market Trends Shaping 2025-2026
Analysis of the booming solar PV and battery storage market, including record installation rates, plummeting costs, policy challenges, and what electrical contractors need to know.
Solar photovoltaics and battery energy storage are experiencing explosive growth, with combined installations representing 91% of new U.S. generating capacity in Q3 2025. As battery costs plummet and solar becomes the dominant source of new electricity generation, electrical professionals must understand the evolving technical requirements and market dynamics.
2025 Market Overview
Photovoltaic solar accounted for 69% of all new electricity-generating capacity additions in Q1 2025. In Q3 2025, solar and battery storage combined for 91% of the 11.7 GW total capacity added.
New utility-scale capacity
New battery capacity
Residential systems paired
Battery Storage: Record Growth
Battery energy storage is experiencing unprecedented growth. In 2025, 40% of new residential solar installations include battery storage, up from single-digit percentages just a few years ago.
Battery Cost Trends
- • 2024 vs 2023: Core BESS equipment costs fell 40%, reaching $165/kWh
- • 10-Year Trend: Average 20% cost reduction per year
- • Deployment Growth: ~80% annual increase over the past decade
2026 Outlook: Challenges Ahead
Key Challenges for 2026
- Policy Uncertainty: Potential changes to federal tax incentives and trade disputes
- Supply Chain Issues: Tariff uncertainty affecting project costs
DC Voltage Drop Optimization
DC voltage drop in PV installations directly reduces energy production and project revenue. The industry standard is to limit DC voltage drop to 1.5-2% from modules to inverter.
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