This week, the overall grades of three diversified utilities stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

TECO Energy, Inc.’s (TE) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). TECO Energy is an energy-related holding company with businesses engaged in regulating electric and gas utility operations, coal mining, and unregulated electric generation. TE also rates an F in Portfolio Grader’s specific subcategory of Sales Growth. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of TE stock.

Alliant Energy Corporation (LNT) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Alliant Energy provides regulated electricity and natural gas services to residential, commercial, and industrial customers in the Midwest region of the United States. The stock also rates an F in Cash Flow. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. To get an in-depth look at LNT, get Portfolio Grader’s complete analysis of LNT stock.

DTE Energy Company (DTE) is having a tough week. The company’s rating falls from a C to a D. DTE Energy provides electricity and natural gas sales, distribution and storage services throughout southeastern Michigan. For a full analysis of DTE stock, visit Portfolio Grader.

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.