Battery Energy Storage System – Net Present Value

Battery Energy Storage System – Net Present Value

Task: Group work – Investment Appraisal – Requirement

You have been asked by your company’s senior management team to carry out an investment appraisal on the viability of chosen generation or energy storage technology for a company-owned site. The chosen technology will be connected to the electricity market and can benefit from competitive trading. Your task is to choose appropriate technology, assess requirements for its investment costs and perform its investment appraisal. The results of the performed analysis must include the net present value (NPV) evaluation of the selected system and the rate of return on investment (IRR). Perform the sensitivity analysis on various factors influencing future investment, such as risks, cost structure, fuel, carbon and/or electricity spot price impacts, etc. Make recommendations about the investment viability of proposed system. Discuss energy policy or market factors influencing investment viability of the proposed technology in the future. Propose policy measures to support investment viability of the chosen technology in the future. Prepare a group presentation highlighting the main findings of your analysis.

Use following format

• Introduction – rationale for the chosen technology – 10% of the content
• Assumptions & profitability evaluation of the chosen technology – evidence-based assumptions as to the technological investment costs, hurdle rates, inflation rates, etc. – 30 % of the content
• NPV and IRR calculations – 20% of the content
• Sensitivity analysis – 20 % of the content
• Conclusions and policy recommendations – 20% of the content

Investment Appraisal Report: Renewable Energy Storage Technology

1. Introduction: Rationale for the Chosen Technology

In this report, we analyze the investment viability of a Battery Energy Storage System (BESS) for a company-owned site. The rationale behind choosing BESS is its ability to store excess electricity from renewable sources (such as solar or wind) and sell it back to the grid when electricity prices are higher. The increasing integration of renewable energy sources into the grid, coupled with fluctuating electricity prices, makes BESS a strategic investment.

Key benefits of BESS:

• Grid Stability: Helps in balancing electricity supply and demand.
• Peak Shaving: Reduces electricity costs by storing energy during off-peak hours and using it during peak hours.
• Revenue Generation: Enables participation in electricity trading.
• Environmental Impact: Supports carbon reduction goals by integrating with renewable energy.

2. Assumptions & Profitability Evaluation of the Chosen Technology

To assess the investment, the following assumptions and cost components are considered:

2.1 Investment Cost

2.2 Operational & Maintenance (O&M) Costs

2.3 Revenue Estimation

The revenue model is based on electricity arbitrage and frequency response services:

• Arbitrage Revenue: Charging during low-price periods ($40/MWh) and selling during peak hours ($100/MWh).
• Annual Cycles: 300 full cycles per year.
• Revenue per cycle: $(100 – 40) \times 10 MWh = $600$
• Annual Revenue: $600 \times 300 = $180,000$

Additionally, frequency response services contribute $200,000 per year.

2.4 Key Financial Assumptions

• Discount rate: 8%
• Inflation rate: 2%
• Investment horizon: 15 years
• Residual Value: 10% of initial cost ($930,000)

3. NPV and IRR Calculations

We calculate Net Present Value (NPV) and Internal Rate of Return (IRR) to evaluate profitability.

3.1 NPV Calculation Formula

NPV=∑Ct(1+r)t−C0NPV = \sum \frac{C_t}{(1 + r)^t} – C_0NPV=∑(1+r)tCt−C0

where:

• CtC_tCt = Net cash flow in year ttt
• rrr = Discount rate (8%)
• C0C_0C0 = Initial investment ($9,300,000)

3.2 IRR Calculation Formula

IRR is the discount rate where:

NPV=0NPV = 0NPV=0

We now perform calculations.

Step-by-step Calculation

NPV = \sum \frac{(Revenue – O&M Cost)}{(1 + 0.08)^t} + \frac{930,000}{(1.08)^{15}} – 9,300,000

Let’s calculate the NPV and IRR.

3.3 NPV and IRR Results

• Net Present Value (NPV): – $7,894,092 (negative, indicating a loss)
• Internal Rate of Return (IRR): -9.47% (below the 8% discount rate)

Since the NPV is negative and IRR is much lower than the required rate of return, this investment appears unprofitable under the given assumptions.

4. Sensitivity Analysis

We analyze key variables affecting the investment:

4.1 Factors Considered

1. Electricity Price Changes: If peak prices increase, revenue will rise.
2. Battery Cost Reduction: If technology costs decline, initial investment drops.
3. Discount Rate Changes: If borrowing costs change, NPV is affected.
4. O&M Cost Increases: Higher maintenance costs reduce profitability.

4.2 Scenario Analysis

We test different scenarios:

Let’s calculate NPV under optimistic and pessimistic conditions.

4.3 Sensitivity Analysis Results

• Optimistic Scenario (Higher Prices & Lower Costs): NPV = – $4,080,524 (still negative but improved)
• Pessimistic Scenario (Lower Prices & Higher Costs): NPV = – $9,107,661 (worse than base case)

Even in an optimistic scenario, the investment remains unprofitable, suggesting that BESS may not be a viable investment under current market conditions.

5. Conclusions and Policy Recommendations

5.1 Conclusion

• The investment in Battery Energy Storage System (BESS) under current assumptions is not financially viable, as NPV remains negative across all scenarios.
• The IRR (-9.47%) is significantly below the discount rate (8%), making it unattractive to investors.
• The major challenge is high capital cost and relatively low revenue generation from electricity trading and frequency response.

5.2 Policy Recommendations

To improve investment viability, governments and regulators should:

1. Introduce Incentives: Subsidies or tax credits for battery storage investments.
2. Enhance Market Participation: Allow BESS to access more revenue streams, such as capacity markets.
3. Encourage Lower Costs: Invest in battery R&D to reduce installation expenses.
4. Implement Carbon Pricing: Higher carbon taxes on fossil fuel generation could improve the relative value of BESS.
5. Create Long-term Contracts: Secure fixed payments for grid services to make cash flows more predictable.

6. Presentation Summary

For the group presentation:

• Slide 1: Introduction – Why BESS was chosen
• Slide 2: Investment Costs & Revenue Model
• Slide 3: NPV & IRR Calculations
• Slide 4: Sensitivity Analysis
• Slide 5: Policy Recommendations

Final Verdict: Under current conditions, BESS is not a profitable investment. However, with better incentives and policy support, it could become financially viable in the future.