This week, three electrical equipment stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

PowerSecure International, Inc. (POWR) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. PowerSecure International provides energy management and conservation solutions to utilities and their commercial, institutional and industrial customers. In Portfolio Grader’s specific subcategories of Earnings Growth, Margin Growth and Sales Growth, POWR also gets A’s. For more information, get Portfolio Grader’s complete analysis of POWR stock.

This is a strong week for Highpower International, Inc. (HPJ). The company’s rating climbs to A from the previous week’s B. Highpower International develops and manufactures nickel metal hydride and lithium-ion rechargeable batteries and related products. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of HPJ stock.

Capstone Turbine Corporation (CPST) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Capstone Turbine is a developer, manufacturer, marketer, and service provider of microturbine technology solutions that are used in stationary distributed power generation applications. Shares of the stock have been changing hands at an unusually rapid pace, up 412.5% from the week prior. For more information, get Portfolio Grader’s complete analysis of CPST stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.