CLNE vs. ACES

Last updated Jun 4, 2026

CLNE (Clean Energy Fuels Corp.) is a stock, while ACES (ALPS Clean Energy ETF) is Alternative Energy Equities fund tracking the CIBC Atlas Clean Energy Index. Over the past 5 years, CLNE returned -26.40%/yr vs -8.73%/yr for ACES. A 0.57 correlation means they provide meaningful diversification when combined.

Performance

CLNE vs. ACES - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Clean Energy Fuels Corp. (CLNE) and ALPS Clean Energy ETF (ACES). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CLNE achieves a -4.29% return, which is significantly lower than ACES's 28.72% return.

CLNE

• 1D: -4.74%
• 1M: -16.94%
• YTD: -4.29%
• 6M: -12.61%
• 1Y: 7.49%
• 3Y*: -22.21%
• 5Y*: -26.40%
• 10Y*: -5.53%

ACES

• 1D: -2.84%
• 1M: 17.92%
• YTD: 28.72%
• 6M: 27.36%
• 1Y: 69.96%
• 3Y*: -1.21%
• 5Y*: -8.73%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

CLNE vs. ACES - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
CLNE Clean Energy Fuels Corp.	-4.29%	-16.33%	-34.46%	-26.35%	-15.17%	-22.01%	235.90%	36.05%	-53.39%
ACES ALPS Clean Energy ETF	28.72%	25.44%	-26.71%	-20.04%	-28.44%	-19.44%	140.33%	51.70%	-9.63%

Correlation

The correlation between CLNE and ACES is 0.37, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.37
Correlation (3Y) Calculated over the trailing 3-year period	0.53
Correlation (5Y) Calculated over the trailing 5-year period	0.59
Correlation (All Time) Calculated using the full available price history since Jul 2, 2018	0.57

The correlation between CLNE and ACES shifts across timeframes, from 0.37 (1 year) to 0.59 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

CLNE vs. ACES — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

CLNE

CLNE Risk / Return Rank: 45
CLNE Sharpe Ratio Rank: 46
CLNE Sortino Ratio Rank: 44
CLNE Omega Ratio Rank: 43
CLNE Calmar Ratio Rank: 46
CLNE Martin Ratio Rank: 45

ACES

ACES Risk / Return Rank: 62
ACES Sharpe Ratio Rank: 64
ACES Sortino Ratio Rank: 58
ACES Omega Ratio Rank: 53
ACES Calmar Ratio Rank: 78
ACES Martin Ratio Rank: 57

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

CLNE vs. ACES - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Clean Energy Fuels Corp. (CLNE) and ALPS Clean Energy ETF (ACES). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

	CLNE	ACES	Difference
Sharpe ratio: Return per unit of total volatility	0.14	2.18	-2.04
Sortino ratio: Return per unit of downside risk	0.60	2.77	-2.17
Omega ratio: Gain probability vs. loss probability	1.07	1.33	-0.26
Calmar ratio: Return relative to maximum drawdown	0.22	4.03	-3.82
Martin ratio: Return relative to average drawdown	0.37	10.16	-9.79
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CLNE vs. ACES - Sharpe Ratio Comparison

The current CLNE Sharpe Ratio is 0.14, which is lower than the ACES Sharpe Ratio of 2.18. The chart below compares the historical Sharpe Ratios of CLNE and ACES, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	CLNE	ACES	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.14	2.18	-2.04
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.40	-0.24	-0.16
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.08	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.13	0.22	-0.35

Drawdowns

CLNE vs. ACES - Drawdown Comparison

The maximum CLNE drawdown since its inception was -95.48%, which is greater than ACES's maximum drawdown of -79.05%. Use the drawdown chart below to compare losses from any high point for CLNE and ACES.

Drawdown Indicators

	CLNE	ACES	Difference
Max Drawdown Largest peak-to-trough decline	-95.48%	-79.05%	-16.43%
Max Drawdown (1Y) Largest decline over 1 year	-34.97%	-17.44%	-17.53%
Max Drawdown (3Y) Largest decline over 3 years	-74.37%	-58.68%	-15.69%
Max Drawdown (5Y) Largest decline over 5 years	-89.86%	-74.44%	-15.42%
Max Drawdown (10Y) Largest decline over 10 years	-92.92%	—	—
Current Drawdown Current decline from peak	-91.60%	-56.41%	-35.19%
Average Drawdown Average peak-to-trough decline	-66.47%	-38.87%	-27.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	20.23%	6.91%	+13.32%

Volatility

CLNE vs. ACES - Volatility Comparison

Clean Energy Fuels Corp. (CLNE) has a higher volatility of 12.22% compared to ALPS Clean Energy ETF (ACES) at 9.99%. This indicates that CLNE's price experiences larger fluctuations and is considered to be riskier than ACES based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CLNE	ACES	Difference
Volatility (1M) Calculated over the trailing 1-month period	12.22%	9.99%	+2.23%
Volatility (6M) Calculated over the trailing 6-month period	32.35%	22.55%	+9.80%
Volatility (1Y) Calculated over the trailing 1-year period	54.80%	32.42%	+22.38%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	65.86%	36.17%	+29.69%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	71.37%	35.59%	+35.78%

Dividends

CLNE vs. ACES - Dividend Comparison

CLNE has not paid dividends to shareholders, while ACES's dividend yield for the trailing twelve months is around 0.54%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
ACES ALPS Clean Energy ETF	0.54%	0.70%	1.10%	1.44%	1.08%	0.71%	0.56%	1.79%	0.34%
CLNE Clean Energy Fuels Corp.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both CLNE and ACES in my portfolio?

CLNE and ACES have a correlation of 0.37, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CLNE or ACES?

CLNE has higher volatility (12.22%) compared to ACES (9.99%). In terms of maximum drawdown, CLNE dropped -95.48% vs ACES's -79.05%.

Which has better risk-adjusted returns?

ACES currently has the higher Sharpe Ratio (2.18 vs 0.14), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.