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Stocks to Compare Sections All Sections Selected Performance Chart Price & Volume MarketRank Analyst Ratings Sales & Book Value Profitability & Earnings Dividends Debt Ownership Miscellaneous Headlines About Compare NYSE:ALCC NYSE:HLGN NASDAQ:OPTT NASDAQ:TERP On This Page Performance ChartPrice & VolumeMarketRank™Analyst RatingsSales & Book ValueProfitability & EarningsDividendsDebtOwnershipMiscellaneousHeadlinesAbout Comparison Ideas Stock Ideas Comparative Price Performance Over Time1 day7 days30 days90 days365 daysCompare Price & VolumeCompanyCurrent Price50-Day Moving Average52-Week RangeMarket CapBetaAvg. VolumeToday's VolumeALCCAltC Acquisition$71.06-3.5%$64.44$10.27▼$18.80$2.17B-0.06723,393 shs10.59 million shsHLGNHeliogen$1.70+2.1%$1.54$0.68▼$3.28$10.42M2.9311,559 shs3,106 shsOPTTOcean Power Technologies$0.49-1.3%$0.56$0.14▼$1.75$88.44M2.628.26 million shs2.04 million shsTERPTerraForm Power$19.35$19.61$11.40▼$21.98$4.38B0.662.97 million shsN/A7 Stocks to Buy And Hold ForeverEnter your email address and we'll send you MarketBeat's list of seven stocks and why their long-term outlooks are very promising. Get This Free ReportCompare Price PerformanceCompany1-Day Performance7-Day Performance30-Day Performance90-Day Performance1-Year PerformanceALCCAltC Acquisition-3.53%-5.66%+10.39%+88.39%+857.68%HLGNHeliogen0.00%0.00%+36.00%-35.36%-24.44%OPTTOcean Power Technologies0.00%-7.40%-29.76%-14.66%+149.54%TERPTerraForm Power0.00%0.00%0.00%0.00%0.00%Compare MarketRank™CompanyOverall ScoreAnalyst's OpinionShort Interest ScoreDividend StrengthESG ScoreNews and Social Media SentimentCompany OwnershipEarnings & ValuationALCCAltC AcquisitionN/AN/AN/AN/AN/AN/AN/AN/AHLGNHeliogen0.3306 of 5 stars0.02.00.00.03.70.00.0OPTTOcean Power Technologies0.2347 of 5 stars0.02.00.00.03.10.00.0TERPTerraForm PowerN/AN/AN/AN/AN/AN/AN/AN/ACompare Analyst ForecastsCompanyConsensus Rating ScoreConsensus RatingConsensus Price Target% Upside from Current PriceALCCAltC Acquisition 0.00N/AN/AN/AHLGNHeliogen 0.00N/AN/AN/AOPTTOcean Power Technologies 0.00N/AN/AN/ATERPTerraForm Power 0.00N/AN/AN/ACompare Sales & Book ValueCompanyAnnual RevenuePrice/SalesCashflowPrice/CashBook ValuePrice/BookALCCAltC AcquisitionN/AN/A$1.51 per share47.00($0.27) per shareN/AHLGNHeliogen$3.92M2.66N/AN/A($1.36) per share-1.25OPTTOcean Power Technologies$5.86M15.09N/AN/A$0.32 per share1.53TERPTerraForm Power$941.24M4.66$1.62 per share11.96$11.51 per share1.68Compare Profitability & EarningsCompanyNet IncomeEPSTrailing P/E RatioForward P/E RatioP/E GrowthNet MarginsReturn on Equity (ROE)Return on Assets (ROA)Next Earnings DateALCCAltC Acquisition$11.87MN/A0.00∞N/AN/A-85.44%2.50%N/AHLGNHeliogen-$129.60M$6.39N/A∞N/AN/AN/A-147.90%N/AOPTTOcean Power Technologies-$27.48M-$0.17N/A∞N/A-304.91%-97.03%-72.36%N/ATERPTerraForm Power-$148.68M-$0.57N/AN/AN/A-20.27%-6.66%-1.69%N/ACompare DividendsCompanyAnnual PayoutDividend Yield3-Year Dividend GrowthPayout RatioYears of Consecutive GrowthALCCAltC AcquisitionN/AN/AN/AN/AN/AHLGNHeliogenN/AN/AN/AN/AN/AOPTTOcean Power TechnologiesN/AN/AN/AN/AN/ATERPTerraForm Power$0.814.19%N/AN/A N/ACompare DebtCompanyDebt-to-Equity RatioCurrent RatioQuick RatioALCCAltC AcquisitionN/A0.150.59HLGNHeliogenN/A0.460.46OPTTOcean Power TechnologiesN/A2.791.37TERPTerraForm Power2.680.800.80Compare OwnershipInstitutional OwnershipCompanyInstitutional OwnershipALCCAltC Acquisition85.03%HLGNHeliogen27.58%OPTTOcean Power Technologies11.93%TERPTerraForm Power92.32%Insider OwnershipCompanyInsider OwnershipALCCAltC Acquisition21.80%HLGNHeliogen3.80%OPTTOcean Power Technologies1.00%TERPTerraForm Power0.02%Compare Miscellaneous StatsCompanyEmployeesShares OutstandingFree FloatOptionableALCCAltC Acquisition230.60 million23.93 millionNo DataHLGNHeliogen5,3056.13 million5.82 millionNo DataOPTTOcean Power Technologies50180.65 million144.58 millionOptionableTERPTerraForm Power177226.52 millionN/AOptionableTERP, ALCC, OPTT, and HLGN HeadlinesRecent News About These CompaniesTerraForm Power Operating Second Quarter 2025 Results Webcast and Conference CallAugust 13, 2025 | globenewswire.comFactor This finance and development roundup: Aligned Climate Capital, Aypa Power, EnergyRe, Silfab Solar, TerraForm PowerMay 16, 2025 | renewableenergyworld.comRBrookfield’s TerraForm Power Accelerates U.S. Development with Acquisition of Sun Tribe DevelopmentMay 15, 2025 | finance.yahoo.comTerraForm Power completes acquisition of Sun Tribe DevelopmentMay 15, 2025 | solarpowerworldonline.comSTerraForm Power Operating First Quarter 2025 Results Webcast and Conference CallMay 14, 2025 | globenewswire.comEnfinity Global Statement on CEO Carlos DomenechApril 3, 2025 | finance.yahoo.comTerraForm Power Press Release Concerning Resolution of Claims Against TerraForm Power and TerraForm GlobalApril 1, 2025 | financialpost.comFTerraForm Power Press Release Concerning Resolution of Claims Against TerraForm Power and TerraForm GlobalApril 1, 2025 | globenewswire.comTerraForm Power Operating Third Quarter 2024 Results Webcast and Conference CallNovember 12, 2024 | globenewswire.comFormer Terps basketball star dies at 55, leaving complex legacyOctober 31, 2024 | 247sports.com2Terps men's basketball team looks to rebound this upcoming seasonOctober 17, 2024 | wmar2news.comWDefensive penalties ‘concerning’ for Terps as prolific Indiana loomsSeptember 28, 2024 | washingtonpost.comTerraform Labs approved for bankruptcy wind-down after US SEC settlementSeptember 19, 2024 | reuters.comThis Week in Chancery Court: Brookfield’s TerraForm BuyoutSeptember 16, 2024 | news.bloomberglaw.comNSEC Secures $4.7 Billion From Crypto Enforcement This Year, A 3,018% Surge Driven By Terraform Labs SettlementSeptember 11, 2024 | insidebitcoins.comITerps look to build on season-opening victory over UConnSeptember 4, 2024 | sports.yahoo.comTerraForm Power Operating Second Quarter 2024 Results Webcast and Conference CallAugust 13, 2024 | globenewswire.comTerraform Labs co-founder and crypto fugitive Do Kwon set for extradition to South KoreaAugust 2, 2024 | techcrunch.comTTerps begin camp in search of starting quarterbackJuly 31, 2024 | wmar2news.comWTerraForm Power Operating First Quarter 2024 Results Webcast and Conference CallMay 14, 2024 | markets.businessinsider.comNew MarketBeat Followers Over TimeMedia Sentiment Over Time Top HeadlinesView All HeadlinesWhy the American Eagle Stock Rally Isn't Just Speculation By Gabriel Osorio-Mazilli | July 28, 20253 Short Squeeze Candidates With Big Catalysts on the HorizonBy Dan Schmidt | July 25, 20253 Stocks Riding the AI Data Center Buildout WaveBy Chris Markoch | August 6, 2025Caterpillar Can (and Will) Crawl Higher: Buy It on the DipBy Thomas Hughes | August 6, 20253 Stocks Helping Build Tomorrow's Data CentersBy Gabriel Osorio-Mazilli | August 16, 2025TERP, ALCC, OPTT, and HLGN Company DescriptionsAltC Acquisition NYSE:ALCC$71.06 -2.60 (-3.53%) As of 08/15/2025AltC Acquisition Corp. does not have significant operations. It intends to effect a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or other business combination with one or more businesses. The company was formerly known as Churchill Capital Corp VIII and changed its name to AltC Acquisition Corp. in February 2021. AltC Acquisition Corp. was incorporated in 2021 and is based in New York, New York.Heliogen NYSE:HLGN$1.70 +0.04 (+2.10%) As of 08/8/2025Heliogen, Inc., together with its subsidiaries, develops and commercializes concentrated solar energy in the United States. It is developing a modular, AI-enabled, concentrated solar energy plant that will use an array of mirrors to reflect sunlight and capture, concentrate, store and convert it into cost-effective energy on demand. The company offers heliostat fields, and associated control systems, solar receivers, thermal energy storage, and heat engines. Its solutions include carbon-free steam production, a system that produces heat or steam for use in industrial processes; net zero power generation system, a turbine generator with the baseline system, which achieves net-zero emissions in electricity production; and green hydrogen production, and electrolyzer with the baseline system that produces green hydrogen fuel. The company also offers professional services, such as turnkey project construction, project site development, and research and development studies. It serves the food and beverage, mining and mineral processing, oil and gas, transportation, chemicals, cement, and metals manufacturing industries. The company was formerly known as Edison Microgrids, Inc. and changed its name to Heliogen, Inc. in November 2019. The company is headquartered in Pasadena, California.Ocean Power Technologies NASDAQ:OPTT$0.49 -0.01 (-1.31%) Closing price 08/15/2025 04:00 PM EasternExtended Trading$0.49 +0.00 (+0.69%) As of 08/15/2025 07:58 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more.Ocean Power Technologies, Inc. develops and commercializes proprietary power platforms that generate electricity by harnessing the renewable energy of ocean waves in North America, South America, Australia, and Asia. It offers PB3 PowerBuoy that generates power for use independent of the power grid in offshore locations. The company also provides Next Generation PowerBuoy; subsea battery systems; and software, controls, sensors, integration services, and marine installation services. In addition, it offers Wave Adaptive Modular Vessel (WAM-V) technology, which enables roaming capabilities for uncrewed maritime systems in waters; leases WAM-V robotics and access information; maritime domain awareness solutions; and strategic consulting services. Further, the company provides offshore data collection, integration, analytics, and real time communication for various applications. It serves public and private entities, and agencies that require remote offshore power. Ocean Power Technologies, Inc. was incorporated in 1984 and is headquartered in Monroe Township, New Jersey.TerraForm Power NASDAQ:TERPTerraForm Power, Inc., together with its subsidiaries, owns and operates clean power generation assets. The company operates through three segments: Solar, Wind, and Regulated Solar and Wind. As of December 31, 2018, its portfolio consisted of solar and wind projects located in the United States, Canada, Spain, Chile, Portugal, the United Kingdom, and Uruguay with a combined nameplate capacity of 3,738 megawatts. The company was formerly known as SunEdison Yieldco, Inc. and changed its name to TerraForm Power, Inc. in May 2014. TerraForm Power, Inc. was founded in 2014 and is headquartered in New York, New York. 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