Mesen Tidal Power Plant is a tidal power plant in Bay Mezenski White Sea , Arkhangelsk region. It is planned that the station will have a capacity of 8 GW and its annual output of electricity will amount to 38.9 billion kWh. Where to stay in TEC Mezen Bay selected because of the large high tides, which here reaches 10 m.

Project to build Mezenskaya Tidal Power Plant began in the Soviet Union, however, due to the collapse of the country and shortage of funds the project frozen. Work on it has resumed after the reorganization of RAO UES.

Development leads JSC Malaya Mesen TEC, a subsidiary of RusHydro. The project is at feasibility stage of development investments (stage "Rationale for the alignment).

In late 2008, the decision of the parent company, the work had been suspended due to reduction of investment costs.

In 2006, the project "Small Mesen PES. Within its framework has been developed prototype floating block on which the orthogonal hydroelectric RSA-5 (the rotation axis is perpendicular to the flow of the turbine). Installed capacity of 1.5 MW unit, the diameter of the impeller is 5 m. The block was made ​​to "ON" Sevmash ", and was then towed to the Barents Sea and is set for Kislogubskaya PES . At present (2009) maintained its full-scale tests.

Of a set of blocks of similar design is planned to create a large DOS (including Mezenskaya).

Electricity is expected to send in Western Europe by the ECO "East-West".

In the case of construction of the station annual fuel savings is estimated at 12.6 million tons of standard fuel , which will prevent the emission into the atmosphere of about 19.45 million tons of carbon dioxide.

The Penzhin Tidal Power Plant Project is a set of proposals for construction of tidal power plant in the Penzhin Bay, which is an upper right arm of Shelikhov Bay in the north-east corner of the Sea of Okhotsk. Because Penzhin Bay has one of the strongest tides, several projects of power station was suggested. One of proposed variants presumes installed capacity 87 GW and annual production 200 TWh of electricity.

Geographically, the dam of the power station would extend through the administrative border of Magadan Oblast and Kamchatka Krai of Russia.

The altitude of tides in Penzhin Bay constitutes 9 metres (30 ft) and reaches 12.9 metres (42 ft) in the case of syzygian tides, that is the highest magnitude for Pacific ocean. As the area of the bay basin is 20,530 km² (7,930 mi²), it corresponds to diurnal discharge of 360−530 km³ (86−130 cu mi). This water rate is 20-30 times higher, than it is for the Amazon River, the biggest river of the Earth. Two projects were developed for tidal power stations. First of them is earliest in time and proposes use of entire basin of the bay. The second one suggests smaller scale plant, which must use northern part of basin with higher tides:

Variant	Tide altitude, m \ ft	Capacity, GW	Annual production, TW·h	Time of research
South site	11 \ 36	87,1	190-205	1972—1996
North site	13.4 \ 44	21,4	50	1983—1996

Due to the lack of local consumers and power lines, there are suggestions of a discrete work of the station to supply power-consuming productions. One of such regulators, for example, would be the production of liquid hydrogen.

Hydrological potential of the bay

The tides in the Penzhin Bay of the Sea of Okhotsk is highest one for Pacific ocean reaching the height 13.4 metres (44 ft). The tides in Shelikhov Bay is a duirnal type, the area of Penzhin Bay basin is 20 530 km². Hence, the assumption, that the average magnitude of tide is equal to 10 metres (33 ft), gives the diurnal flow of water in the bay equal to 410.6 cubic kilometres (98.5 cu mi) or average discharge 4.75×10⁶ m³•sec^-1.

The passing stream has its own potential energy, which in the gravity field of Earth is above zero only in the case of non-zero head of water (H_Head) and can be expressed as follows:

, (1)

where E denotes potential anergy; ρ_sw — density of sea water, equal to 1,027 kg/m³; S_Basin — area of basin; H_Tide — height of the tide and g — gravitational acceleration, set to 9.81 m/sec². The part of expression in brackets denotes terms defining the mass of water passing through the basin daily.

As it can be seen in formula (1), the potential energy becomes zero in the case of zero head of water and in the case of equal heights of head and tide. Regarding this formula as function of head (H_Head), it is a parabolic function, which has the maximum at H_Tide = 2•H_Head or at H_Head = 5 m. This value of H_Head gives two times lower height of tide in the bay and twice smaller average discharge of water — 5 m and 2.38×10⁶ m³•sec^-1 (205.3 km³/day), correspondingly.

The substitution of obtained parameters into (1) and dividing it by the day length in seconds gives the average capacity 120 GW. The latter one allows to obtain 1,054 TW•h or 3.79×10¹⁸ Joules of energy annually. Depending on the efficiency of conversion of potential energy into electricity, the total quantity of electricity and electric capacity will have somewhat lower values. The assumption, that the efficiency of conversion is equal to 96%, gives an average electric capacity 115 GW and available amount of electricity 1,012 TW•h or 3.64×10¹⁸ J per year.

The Kislaya Guba Tidal Power Plant is an experimental project in Kislaya Guba, Russia.

The Kislaya Guba Tidal Power is the world's 4th largest tidal power plant with the output capacity of 1.7 MW. Construction on the project began in 1968, but was later suspended for 10 years until December 2004, when funding resumed. The site was originally chosen because the long and deep fjord had a fairly narrow outlet to the sea which could easily be dammed for the project. There are plans for two larger scale projects based on this design near Mezen, on the White Sea and Tugur on the Sea of Okhotsk.

Kislaya Guba Tidal Power Station
Country	Russia
Locale	Kislaya Guba
Status	Operational
Commission date	1968
Owner(s)	RusHydro
Power station information
Primary fuel	Tide
Generation units	1 × 0.2 MW 1 × 1.5 MW
Power generation information
Installed capacity	1.7 MW