Introduction
Energy storage stations are increasingly critical in modern power systems. The Lingshan Energy Storage Station in Pingdingshan, with a 4.8 MW / 4.8 MWh lithium iron phosphate system, demonstrates practical grid-side storage applications. It provides peak-shaving, black start, demand response, and other services, ensuring stable grid operation and improving renewable energy consumption.
1. Why Peak-Shaving Is Needed
Power systems consist of generation (hydro, thermal, nuclear, solar, wind) and consumption (factories, enterprises, malls, households). Energy storage stations can both consume and supply electricity, balancing load and generation. Peak-shaving units help reduce generator overload during peaks and prevent unnecessary operation during low-demand periods.
2. Methods of Peak-Shaving in Power Systems
Peak-shaving strategies include:
Pumped Storage Units: Mature technology, high capacity, but land-intensive.
Generator Units: Coal or gas turbines, slower response, cannot absorb grid surplus.
Energy Storage Stations: Fast response, effective peak reduction, but higher initial cost and limited battery life.
3. How ESS Participates in Peak-Shaving
Government-directed centralized ESS: Facilities above 10 MW are scheduled by dispatch agencies.
User-side ESS: Can participate in deep peak-shaving and start-stop peak-shaving.
4. Investment Return Calculations
Revenue comes from the price difference between peak and valley electricity and peak-shaving compensation.
Assuming the installation of a 20 MW / 100 MWh energy storage system, and calculating revenue based on wind power grid discharge pricing, the estimated income from peak-shaving participation is as follows:
Daily Peak-Shaving Income:
Deep peak-shaving service fee = 40 MWh × 500 CNY/MWh = 20,000 CNY
Daily Energy Arbitrage Income:
Discharge energy = 40 MWh = 40,000 kWh
Sale income = 40,000 kWh × 0.6 CNY/kWh × 80% system efficiency = 19,200 CNY
Annual Income:
Annual income = (20,000 + 19,200) × 300 days = 11.76 million CNY
Investment Payback Period:
Total system cost ≈ 48 million CNY
Payback period ≈ 4.08 years
These calculations show the economic viability and strategic value of ESS for grid stability and renewable integration.
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