Berkshire Hathaway's Energy Stocks

I assume most folks have seen this article in today's SeekingAlpha site: a look at Warren Buffett's energy stocks.

The writer doesn't say that Berkshire Hathaway has "only" three energy stocks but he certainly suggests it. From the lede.

The Oracle of Omaha, Warren Buffett, doesn't own many energy companies, but he does own three.

COP, PSX, and NOV (National Oilwell Varco).

That was it.

The writer missed a few energy companies Warren owns:

• MidAmerican Energy Company
• MidAmerican Renewables
• PacifiCorp
• Northern Power Grid
• Integrated Utility Services US 
• CalEnergy Generation
• Kern River Gas Transmission Company, Kern River Pipeline
• Northern Natural Gas Company
• BYD Company, 10% of outstanding shares (autos and batteries)

One can also argue that his ownership of the Burlington Northern Railroad is an energy play. At least a major portion of it.