Stocks that are members of the S&P 500 and have increased dividends for 25 straight years are commonly referred to as Dividend Aristocrats.

However, there is a class of dividend stocks even more prestigious than Dividend Aristocrats and known as Dividend Kings.

Dividend kings are stocks that are members of the S&P 500 and have increased dividends for 50 straight years. Here are two Dividend Kings that can help you generate passive income for your portfolio.

Northwest Natural Holdings Company NWN offers a dividend yield of 3.85%, or $1.93 per share annually through quarterly payments, as this king has a consistent track record of growing its dividends over the past 66 years. Northwest Natural Holdings operates through the natural gas distribution segment, purchasing and distributing natural gas over approximately 250,000 feet in Oregon and southwest Washington.

Northwest Natural Holdings added nearly 10,200 natural gas meters over the last 12 months, representing a growth rate of 1.3% as of June 30, 2022.

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American States Water Company AWR offers a dividend yield of 1.84%, or $1.59 per share annually when paid quarterly, with an amazing track record of growing its dividends for 69 consecutive years. Water of the American States conducts water and electricity operations through the Golden State Water Company and contracts services with American States Utility Services and its subsidiaries.

American States Water plans to invest US$2.5 billion in 2022 and is on track with its capital investment plan for the first six months of 2022 with investments totaling US$1.25 billion, including US$1.0 billion -Dollar for infrastructure improvements in the regulated companies segment, on track.